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Geovetenskap och miljövetenskap, Earth and Related Environmental Sciences, litter removal, prairie restoration, prescribed fire, seed predation, tallgrass prairie, community structure, foraging behavior, plant litter, restoration, fire, rodents, establishment, recruitment, persistence, limitation, and Environmental Sciences & Ecology

Understanding patterns of seed predation in tallgrass prairie restorations is vital because seed additions are often used by managers to increase diversity and promote native species. However, the success of seed additions depends on the extent of seed predation. It is not clear how seed predation varies through time and to what extent it is affected by various commonly used management techniques in grasslands (e.g. spring or fall prescribed burns, mowing). We examined how predation of Sorghastrum nutans seeds changed during eight trials between June 2018 and April 2019 in plots that received one of four different plant litter removal treatments (fall mow, fall burn, spring burn, and unaltered control). Granivory varied throughout the year, reaching its peak in the late fall and early winter. However, we found that seed predators consumed significantly fewer seeds when litter was removed following fall burn and fall mow treatment applications. These treatments occurred during times when granivory was otherwise high in areas where litter remained intact (control and spring burn plots). Our findings highlight the importance of management decisions and how they interact with granivory in grassland restorations. Both time of year and litter cover determine seed predation rates; seed predators consume more seeds when seeds are abundant but rely on intact litter cover while foraging. This suggests that if seeds are added during the fall, litter should be removed to minimize the loss of seeds to granivory. Alternatively, seed additions during the spring are likely to experience lower rates of seed predation.

Pharmacology drugs, Pharmacologie, galénique, Sciences biologiques et medicales, Biological and medical sciences, Sciences medicales, Medical sciences, Pharmacologie. Traitements medicamenteux, Pharmacology. Drug treatments, Pharmacologie générale, General pharmacology, Méthodes de contrôle, Analysis, Carboxylic ester hydrolases, Encéphale pathologie, Cerebral disorder, Encéfalo patología, Enzyme, Enzima, Esterases, Hydrolases, Maladie dégénérative, Degenerative disease, Enfermedad degenerativa, Système nerveux central pathologie, Central nervous system disease, Sistema nervosio central patología, Système nerveux pathologie, Nervous system diseases, Sistema nervioso patología, Anticholinestérasique, Anticholinesterase agent, Anticolinesterasa agente, Chimiothérapie, Chemotherapy, Quimioterapia, Cholinesterase, Chromatographie HPLC, HPLC chromatography, Cromatografía HPLC, Démence Alzheimer, Alzheimer disease, Demencia Alzheimer, Homme, Human, Hombre, Inhibiteur enzyme, Enzyme inhibitor, Inhibidor enzima, Pharmacocinétique, Pharmacokinetics, Farmacocinética, Plasma sanguin, Blood plasma, Plasma sanguíneo, Tacrine, Tacrina, Traitement, Treatment, Tratamiento, Voie orale, Oral administration, Vía oral, Suivi thérapeutique médicamenteux, and Therapeutic drug monitoring

A new high-performance liquid chromatography (HPLC) assay method was developed for the therapeutic monitoring of tacrine, The method involved a simple protein precipitation by means of either acetonitrile or cold methanol followed by a fast isocratic separation on a CN column eluted in reversed-phase mode. The entire sample preparation took place in an HPLC vial and no further liquid transfer was required. The validation data showed that the assay method was precise, accurate, and robust. Analysis of more than 1,000 plasma samples collected from patients with Alzheimer disease demonstrates the suitability of the assay.

Analytical chemistry, Chimie analytique, Sciences exactes et technologie, Exact sciences and technology, Chimie, Chemistry, Chimie generale et chimie physique, General and physical chemistry, Solutions, Propriétés des solutions, Solution properties, Métal transition Complexe, Transition metal Complexes, Metal transición Complejo, Platinoïde Complexe, Platinoid Complexes, Platinoide Complejo, Acide thiocarboxylique, Thiocarboxylic acid, Acido tiocarboxílico, Aminoacide soufré, Sulfur containing aminoacid, Aminoácido azufrado, Constante protonation, Protonation constant, Constante protonación, Constante stabilité, Stability constant, Constante estabilidad, Coordinat organique, Organic ligand, Ligando orgánico, Effet coordinat, Ligand effect, Efecto ligando, Effet milieu, Medium effect, Efecto medio, Etude expérimentale, Experimental study, Estudio experimental, Palladium Complexe, Palladium Complexes, Paladio Complejo, Propriété chimique, Chemical properties, Propiedad química, Solution aqueuse, Aqueous solution, Solución acuosa, Spectrométrie UV visible, Ultraviolet visible spectrometry, Espectrometría UV visible, Titrage électrochimique, Electrochemical titration, Dosificación electroquímica, and pH

The stability constants of the palladium(II) complexes with sulphur-containing acids HnL :thioglycolic acid, methylthioglycolic acid, L-cysteine, D,L-penicillamine, S-methyl-L-cysteine, D,L-methionine, and D,L-ethionine, were determined using potentiometric pH titrations and spectrophotometric measurements at 25 C and I = 1.00(NaClO4). The anionic complexes PdBr42- and Pd(SCN)42- were used for this purpose as they give the complexes PdL and PdL2 in the pH range 2-8 with liberation of hydrogen ions from the protonated ligands. The stability constants were also obtained in I M HClO4 using spectrophotometric measurements. The agreement between the values obtained by both methods are within 0.1 logarithmic unit. The spectral data of the complexes are given and compared with those of the glycine complexes. The palladium(II) complexes with thiolate and thioether ligands are more stable relative to those of mercury(II), the latter showing a much larger selectivity.

Analytical chemistry, Chimie analytique, Sciences exactes et technologie, Exact sciences and technology, Chimie, Chemistry, Chimie generale et chimie physique, General and physical chemistry, Solutions, Propriétés des solutions, Solution properties, Métal Complexe, Metal Complexes, Metal Complejo, Métal transition Complexe, Transition metal Complexes, Metal transición Complejo, Complexe anionique, Anionic complex, Complejo aniónico, Complexe dinucléaire, Dinuclear complex, Complejo dinuclear, Complexe hétéronucléaire, Heteronuclear complex, Complejo heteronuclear, Constante protonation, Protonation constant, Constante protonación, Constante stabilité, Stability constant, Constante estabilidad, Coordinat organique, Organic ligand, Ligando orgánico, Cuivre Thallium Complexe, Copper Thallium Complexes, Cobre Talio Complejo, Etude expérimentale, Experimental study, Estudio experimental, Propriété chimique, Chemical properties, Propiedad química, Solution aqueuse, Aqueous solution, Solución acuosa, Spectrométrie UV visible, Ultraviolet visible spectrometry, Espectrometría UV visible, Titrage acide base, Acid base titration, Dosificación ácido base, and TTHA

The equilibria involving the thallium(III) triethylenetetraminehexaacetate complex [Tl(ttha)]3- were studied. Its stability constant was estimated using UV-VIS spectrophotometry for the ligand exchange occurring between bromide and ttha in the pH range from 0 to 10. The protonated complex [Tl(H3ttha)] is a weak acid allowing the determination of the stability constant of the heterobinuclear complexes [MTl(ttha)]- (M = Co, Ni, Cu, Zn, Cd and Pb) by use of alkalimetric titrations of the above acid in presence of different metal ions. In the case of copper the stability constant was also measured spectrophotometrically. The complex formation in solution was verified in two cases by matrix-assisted laser desorption ionisation time-of-flight mass spectrometry. The results obtained are discussed and compared with those of other similar ligands.

Analytical chemistry, Chimie analytique, Sciences exactes et technologie, Exact sciences and technology, Chimie, Chemistry, Chimie generale et chimie physique, General and physical chemistry, Solutions, Propriétés des solutions, Solution properties, Métal transition Complexe, Transition metal Complexes, Metal transición Complejo, Complexe anionique, Anionic complex, Complejo aniónico, Complexe hydruro, Hydrido complex, Complejo hidruro, Complexe polynucléaire, Polynuclear complex, Complejo polinuclear, Constante association, Association constant, Constante asociación, Constante stabilité, Stability constant, Constante estabilidad, Constante équilibre, Equilibrium constant, Constante equilibrio, Coordinat organique, Organic ligand, Ligando orgánico, Coordinat polydenté, Polydentate ligand, Ligando polidentado, Effet coordinat, Ligand effect, Efecto ligando, Effet milieu, Medium effect, Efecto medio, Etude expérimentale, Experimental study, Estudio experimental, Mercure Complexe, Mercury Complexes, Mercurio Complejo, Nickel Complexe, Nickel Complexes, Niquel Complejo, Propriété chimique, Chemical properties, Propiedad química, Solution aqueuse, Aqueous solution, Solución acuosa, Zinc Complexe, Zinc Complexes, Zinc Complejo, pH, and EDTA analogue

Complex formation by O,O'-bis-(β-aminoethyl)-ethyleneglycol-N,N,N',N'-tetraacetat (egta) with Ni2+ and Zn2+ and of 1,5-diaminopentane-N,N,N',N'-tetraacetate (peta) with Ni2+ was investigated at 20°C and I = 1.00 (KNO3) using alkalimetric titrations of equimolar solutions of the components in the range 0.5-32 mM. While Zn2+ forms only mononuclear species, Ni2+ gives mono-, NiL2-, and polynuclear NiqHLq(q-1)- (q =1, 2, 3, 4, 5, 6) complexes. Complex formation by Hg2+ with edta and its homologues was investigated by emf measurements (glass and Hg electrode) under the same conditions. The total concentrations of mercury(II) was varied from 0.01 to 50 mM, using a metal-ligand ratios of 1: 2. Only species with the same q value, of the type HgqLq2q-, were present in these solutions, in the pH range 5-8, irrespective of the total concentrations of the components. The value of q is one for edta and two for the other ligands. The stability constants increase as the number of methylene groups between N atoms increases from 3 to 5. The concentration stability constants of all the species formed are reported.

Analytical chemistry, Chimie analytique, Sciences exactes et technologie, Exact sciences and technology, Chimie, Chemistry, Chimie generale et chimie physique, General and physical chemistry, Solutions, Propriétés des solutions, Solution properties, Lanthanide Complexe, Lanthanide Complexes, Lantánido Complejo, Métal Complexe, Metal Complexes, Metal Complejo, Métal transition Complexe, Transition metal Complexes, Metal transición Complejo, Complexe dinucléaire, Dinuclear complex, Complejo dinuclear, Complexe hydroxo, Hydroxo complex, Complejo hidroxo, Constante stabilité, Stability constant, Constante estabilidad, Coordinat organique, Organic ligand, Ligando orgánico, Effet milieu, Medium effect, Efecto medio, Etude expérimentale, Experimental study, Estudio experimental, Gallium Complexe, Gallium Complexes, Galio Complejo, Lanthane Complexe, Lanthanum Complexes, Lantano Complejo, Manganèse Complexe, Manganese Complexes, Manganeso Complejo, Méthode potentiométrique, Potentiometric method, Método potenciométrico, Propriété chimique, Chemical properties, Propiedad química, Solution aqueuse, Aqueous solution, Solución acuosa, Titrage électrochimique, Electrochemical titration, Dosificación electroquímica, pH, and TTHA

The equilibria of triethylenetetraminehexaacetic acid (ttha), an H6L type ligand, with Mn(II), La(III) and Ga(III) as well as with Ga(III) in combination with Ca(II) were studied potentiometrically in aqueous solution at constant ionic strength I=0.1(KNO3) and 25°C. The binary mononuclear complexes identified with Mn(II), La(III) and Ga(III) are: MnL4-, LaL3-, GaL3- (L is the fully deprotonated ligand ttha6-), their corresponding protonated species MnHpL(4-p)- (p=1,2,3), LaHpL(3-p)- (p=1,2), GaHpL(3-p) (p=1,2,3) and the hydroxo species Ga(OH)L4 with Ga(III) only. The binuclear complexes identified with Mn(II), La(III) and Ga(III) are: Mn2L2-, La2L and Ga2L together with the corresponding monoprotonated species of La(III) and Ga(III), La2HL+ and Ga2HL+. Only Ga(III) is able to form a series of soluble binuclear hydroxo complexes of the form Ga2(OH)pLp- (p=1,2,3). The reaction of Ga(III) and excess of Ca(II) with ttha resulted in the formation of heterobinuclear mixed-valence complexes GaCaL-, the corresponding protonated species GaCaHpL(p-1)+ (p=1,2) and the major hydroxo species CaGa(OH)L2-. A comparison with the literature data is given whenever possible.

Analytical chemistry, Chimie analytique, Sciences exactes et technologie, Exact sciences and technology, Chimie, Chemistry, Chimie minerale et origine de la vie, Inorganic chemistry and origins of life, Cinétique et mécanisme des réactions, Kinetics and mechanism of reactions, Métal divalent Complexe, Divalent metal Complexes, Metal divalente Complejo, Bismuth III Complexe, Bismuth III Complexes, Bismuto III Complejo, Cadmium II Complexe, Cadmium II Complexes, Cadmio II Complejo, Complexation, Complexación, Constante protonation, Protonation constant, Constante protonación, Coordinat organique, Organic ligand, Ligando orgánico, Diamine, Diamina, Hétérocycle azote, Nitrogen heterocycle, Heterociclo nitrógeno, Plomb II Complexe, Lead II Complexes, Plomo II Complejo, Polarographie, Polarography, Polarografía, Sélectivité, Selectivity, Selectividad, Taille cycle, Ring size, Dimensión ciclo, Ethylènediamine(N,N'-di-2-picolyl), Ethylènediamine(N,N,N',N'-tétra-2-picolyl), and Propane-1,3-diamine(N,N'-di-2-picolyl)

Ligands containing pyridyl groups and saturated nitrogens as donor groups, DPA-2 (N,N'-di-2-picolylethylenediamine), DPA-3 (N,N'-di-2-picolyl-1,3-propanediamine), and TPEN (N,N,N',N'-tetra-2-picolylethylenediamine) were studied with large metal ions in 0.1 M NaNO3 at 25°C. The pair of ligands DPA-2 and DPA-3 which form five and six-membered chelate rings, respectively, between two central nitrogen donor atoms was studied with CdII, PbII, and BiIII by glass electrode potentiometry, by differential pulse polarography (DPP), and by differential pulse voltammetry (DPV). The complexes of TPEN with CdII, PbII, and BiIII were studied by DPP, and with HgII by metal electrode potentiometry. Glass electrode potentiometry could not be used for metal-TPEN systems because precipitation of complexes occurs during titration and complexes are formed much below pH 2. Protonation constants and complex formation constants for these ligands and metal ions are reported.

Analytical chemistry, Chimie analytique, Sciences exactes et technologie, Exact sciences and technology, Chimie, Chemistry, Chimie generale et chimie physique, General and physical chemistry, Solutions, Propriétés des solutions, Solution properties, Chimie minerale et origine de la vie, Inorganic chemistry and origins of life, Cinétique et mécanisme des réactions, Kinetics and mechanism of reactions, Propriété chimique, Chemical properties, Propiedad química, Amine tertiaire, Tertiary amine, Amina terciaria, Calcium Ion, Calcium Ions, Carboxylate, Carboxilato, Complexation, Complexone, Complexona, Constante stabilité, Stability constant, Constante estabilidad, Constante équilibre, Equilibrium constant, Constante equilibrio, Cuivre Ion, Copper Ions, Glycine, Glicina, Nickel Ion, Nickel Ions, Potentiométrie, Potentiometry, Potenciometría, and Nitrilotriacétate

The stability constants of the complexes of glycinate ion with copper(II), nickel(II) and hydrogen(I) and of nitrilotriacetate ion with calcium(II) and hydrogen(I) and the ionic product of water (Kw) were determined potentiometrically. The measurements were carried out at 25.0°C in four different ionic strengths up to I (=Ic) = 2.50 and two different ionic media (KNO3 and (CH3)4NNO3). Extrapolation of equilibrium constants to zero ionic strength and ionic strength corrections to equilibrium constants were carried out with the data obtained from both media using the TEC (thermodynamic equilibrium constant) equation and computer program. The constants of the potassium complexes with nitrilotriacetic acid at low ionic strength are also given. Successful attempts to predict equilibrium constants for other ionic media using TEC parameters and the procedure of the specific ion-interaction theory (SIT) are given. The variations of equilibrium constants with the ionic strengths and ionic media are demonstrated.

Analytical chemistry, Chimie analytique, Sciences exactes et technologie, Exact sciences and technology, Chimie, Chemistry, Chimie generale et chimie physique, General and physical chemistry, Solutions, Propriétés des solutions, Solution properties, Coefficient activité, Activity coefficient, Coeficiente actividad, Constante équilibre, Equilibrium constant, Constante equilibrio, Etude théorique, Theoretical study, Estudio teórico, Extrapolation, Extrapolación, Force ionique, Ionic strength, Fuerza iónica, Propriété thermodynamique, Thermodynamic properties, Propiedad termodinámica, Solution aqueuse, Aqueous solution, Solución acuosa, Solution électrolyte, Electrolyte solution, and Solución electrólito

Different Debye-Hückel expressions for the activity coefficients of species in aqueous solution in the ionic strength range I=0-3.5m (3M) are used for the extrapolation of equilibrium constants data to I=0 and the interpolation to unknown I values. This may be accomplished using four or more values of the equilibrium constants that are equally well distributed on the I scale. The interpolated and extrapolated equilibrium constant values obtained are quite satisfactory and within the experimental error of the corresponding equilibrium constants. The values at I≤0.1 are very important as they can particularly influence the equilibrium constant value calculated at I=0 and for which the error can reach 0.1 log unit or more.

Biotechnology, Biotechnologies, Chemistry, Chimie, Atomic molecular physics, Physique atomique et moléculaire, Sciences exactes et technologie, Exact sciences and technology, Physique, Physics, Etat condense: structure, proprietes mecaniques et thermiques, Condensed matter: structure, mechanical and thermal properties, Structure des liquides et des solides; cristallographie, Structure of solids and liquids; crystallography, Structure de solides cristallins particuliers, Structure of specific crystalline solids, Composés minéraux, Inorganic compounds, Complexes métalliques, Metal complexes, Chimie, Chemistry, Chimie minerale et origine de la vie, Inorganic chemistry and origins of life, Préparations et propriétés, Preparations and properties, Sels complexes, Coordination compounds, Métal divalent Complexe, Divalent metal Complexes, Metal divalente Complejo, Métal transition Complexe, Transition metal Complexes, Metal transición Complejo, Cobalt II Complexe, Cobalt II Complexes, Cobalto II Complejo, Constante protonation, Protonation constant, Constante protonación, Cuivre II Complexe, Copper II Complexes, Cobre II Complejo, Diffraction RX, X ray diffraction, Difracción RX, Etude expérimentale, Experimental study, Estudio experimental, Nickel II Complexe, Nickel II Complexes, Niquel II Complejo, Stabilité chimique, Chemical stability, Estabilidad química, Structure cristalline, Crystalline structure, Estructura cristalina, Structure moléculaire, Molecular structure, Estructura molecular, Zinc II Complexe, Zinc II Complexes, and Zinc II Complejo

Analytical chemistry, Chimie analytique, Sciences exactes et technologie, Exact sciences and technology, Chimie, Chemistry, Chimie analytique, Analytical chemistry, Méthodes électrochimiques, Electrochemical methods, Analyse chimique, Chemical analysis, Análisis químico, Constante stabilité, Stability constant, Constante estabilidad, Métal Complexe, Metal Complexes, Metal Complejo, Potentiométrie, Potentiometry, Potenciometría, Volumétrie, Volumetric analysis, Volumetría, and pH

The use of different cells for pH measurements for the determination of equilibrium constants of metal complexes is discussed in relation to the liquid junction potential connected with them. The effects of H+aq and OH-aq on this quantity are also considered. The literature values for the conversion factor A, representing the difference in pH value based on the calibration with NBS buffers and that defined in terms of H+ concentration, are discussed.

Biotechnology, Biotechnologies, Chemistry, Chimie, Atomic molecular physics, Physique atomique et moléculaire, Sciences exactes et technologie, Exact sciences and technology, Chimie, Chemistry, Chimie minerale et origine de la vie, Inorganic chemistry and origins of life, Préparations et propriétés, Preparations and properties, Sels complexes, Coordination compounds, Métal transition Complexe, Transition metal Complexes, Metal transición Complejo, Platinoïde Complexe, Platinoid Complexes, Platinoide Complejo, Amine, Amina, Complexe aqua, Aqua complex, Complejo aqua, Complexe cationique, Cationic complex, Complejo catiónico, Coordinat organique, Organic ligand, Ligando orgánico, Coordinat tripode, Tripod ligand, Ligando tripode, Palladium II Complexe, Palladium II Complexes, Paladio II Complejo, Spectrométrie absorption, Absorption spectrometry, Espectrometría absorción, and Triéthylamine(2,2p,2s-tris [diméthylamino])

Analytical chemistry, Chimie analytique, Sciences exactes et technologie, Exact sciences and technology, Chimie, Chemistry, Chimie minerale et origine de la vie, Inorganic chemistry and origins of life, Cinétique et mécanisme des réactions, Kinetics and mechanism of reactions, Métal Ion, Metal Ions, Metal Ión, Complexation, Complexación, Coordinat organique, Organic ligand, Ligando orgánico, Equilibre chimique, Chemical equilibrium, Equilibrio químico, Fluorure, Fluorides, Fluoruro, Force ionique, Ionic strength, Fuerza iónica, Nitrate, Nitrates, and Nitrato

The inert salts used for the investigations of complex formation are briefly discussed in relation to the effects of their ions on the equilibria studied. In general, some association with the inert salt ions cannot be completely avoided. In case of very stable complexes measured at low ionic strength, their effects can be quantified even though they are not caused by the anion if NO3- or ClO4- are used.

Inorganic chemistry, Chimie minérale, Crystallography, Cristallographie cristallogenèse, Atomic molecular physics, Physique atomique et moléculaire, Sciences exactes et technologie, Exact sciences and technology, Chimie, Chemistry, Chimie minerale et origine de la vie, Inorganic chemistry and origins of life, Cinétique et mécanisme des réactions, Kinetics and mechanism of reactions, Acide carboxylique, Carboxylic acid, Acido carboxílico, Amine secondaire, Secondary amine, Amina secundaria, Amine tertiaire, Tertiary amine, Amina terciaria, Argent I Complexe, Silver I Complexes, Plata I Complejo, Complexone, Complexona, Coordinat organique, Organic ligand, Ligando orgánico, Diamine, Diamina, Equilibre chimique, Chemical equilibrium, Equilibrio químico, Métal monovalent Complexe, Univalent metal Complexes, Metal monovalente Complejo, Métal transition Complexe, Transition metal Complexes, Metal transición Complejo, Potentiométrie, Potentiometry, Potenciometría, EDTA, Ethylènediamine, Iminodiacétique acide, and Nitrilotriacétique acide

The complex formation of Ag+ with iminodiacetate (IDA), nitrilotriacetate (NTA), 1,2-ethylenediamine-N,N,N',N'-tetraacetate (EDTA), 1,3-diaminopropane-N,N,N',N'-tetraacetate (TMTA) and 1,4-diaminobutane-N,N,N',N'-tetraacetate (TETA) has been studied using potentiometric measurements at 25°C and I=1(KNO3). The results obtained by different total concentrations of the components in the range 1×10-3 to 4×10-2 M are interpreted with formation of the following species.

Inorganic chemistry, Chimie minérale, Crystallography, Cristallographie cristallogenèse, Atomic molecular physics, Physique atomique et moléculaire, Sciences exactes et technologie, Exact sciences and technology, Chimie, Chemistry, Chimie generale et chimie physique, General and physical chemistry, Thermodynamique chimique, Chemical thermodynamics, Amine tertiaire, Tertiary amine, Amina terciaria, Carboxylate, Carboxilato, Complexation, Complexación, Complexone, Complexona, Constante stabilité, Stability constant, Constante estabilidad, Etude expérimentale, Experimental study, Estudio experimental, Métal alcalinoterreux Ion, Alkaline earth metal Ions, Metal alcalino-térreo, Métal transition Ion, Transition metal Ions, Metal transición, Potassium Nitrate, Potassium Nitrates, Potasio, Propriété thermodynamique, Thermodynamic properties, Propiedad termodinámica, and 2,2p-Iminodiacétate(«α»-phényl)

The heat developed by addition of a metal nitrate solution to that of a neutralized complexing agent has been determined at 25°C and I=0.1 (KNO). By use of the known stability constants of the 1:1 complexes, it allows the calculation of the involved thermodynamic functions. The change of the free enthalpies of metal complex formation with substituted iminodiacetate derivatives of different basicities is correlated with that of the enthalpies of complex formation whereas the entropic term depends on the ligand size.

Inorganic chemistry, Chimie minérale, Crystallography, Cristallographie cristallogenèse, Atomic molecular physics, Physique atomique et moléculaire, Sciences exactes et technologie, Exact sciences and technology, Physique, Physics, Etat condense: structure, proprietes mecaniques et thermiques, Condensed matter: structure, mechanical and thermal properties, Structure des liquides et des solides; cristallographie, Structure of solids and liquids; crystallography, Structure de solides cristallins particuliers, Structure of specific crystalline solids, Composés minéraux, Inorganic compounds, Complexes métalliques, Metal complexes, Chimie, Chemistry, Chimie minerale et origine de la vie, Inorganic chemistry and origins of life, Préparations et propriétés, Preparations and properties, Sels complexes, Coordination compounds, Carboxylate, Carboxilato, Complexe anionique, Anionic complex, Complejo aniónico, Complexe dinucléaire, Dinuclear complex, Complejo dinuclear, Complexe oxo, Oxo complex, Complejo oxo, Coordinat organique, Organic ligand, Ligando orgánico, Diffraction RX, X ray diffraction, Difracción RX, Dimère, Dimer, Dímero, Etude expérimentale, Experimental study, Estudio experimental, Hydrate, Hydrates, Hidrato, Métal transition Complexe, Transition metal Complexes, Metal transición, Métal tétravalent Complexe, Tetravalent metal Complexes, Metal tetravalente, Structure cristalline, Crystalline structure, Estructura cristalina, Structure moléculaire, Molecular structure, Estructura molecular, Technétium IV Complexe, Technetium IV Complexes, Tecnecio IV, and Oxalate

The synthesis and characterization of the complex K4[(C2O4)2Tc(μ-O)2Tc(C2O4)2]•3H2O by IR, UV-Vis spectroscopy is described; X-ray crystal structure determination is also reported. The complex is dimeric and contains a Tc(μ-O)2Tc unit in which a strong Tc-Tc interaction is present. Crystals are triclinic, space group P1.

Inorganic chemistry, Chimie minérale, Crystallography, Cristallographie cristallogenèse, Atomic molecular physics, Physique atomique et moléculaire, Sciences exactes et technologie, Exact sciences and technology, Physique, Physics, Etat condense: structure, proprietes mecaniques et thermiques, Condensed matter: structure, mechanical and thermal properties, Structure des liquides et des solides; cristallographie, Structure of solids and liquids; crystallography, Structure de solides cristallins particuliers, Structure of specific crystalline solids, Composés minéraux, Inorganic compounds, Complexes métalliques, Metal complexes, Chimie, Chemistry, Chimie minerale et origine de la vie, Inorganic chemistry and origins of life, Préparations et propriétés, Preparations and properties, Sels complexes, Coordination compounds, Métal transition Complexe, Transition metal Complexes, Metal transición Complejo, Métal tétravalent Complexe, Tetravalent metal Complexes, Metal tetravalente Complejo, Ammonium quaternaire composé, Quaternary ammonium compound, Amonio cuaternario compuesto, Coordinat organique, Organic ligand, Ligando orgánico, Diffraction RX, X ray diffraction, Difracción RX, Etude expérimentale, Experimental study, Estudio experimental, Solvate, Solvatado, Structure cristalline, Crystalline structure, Estructura cristalina, Structure moléculaire, Molecular structure, Estructura molecular, Technétium IV Complexe, Technetium IV Complexes, and Tecnecio IV Complejo