Clayman, Naomi E., Manumpil, Mary Anne, Umeyama, Daiki, Rudenko, Andrey E., Karunadasa, Hemamala I., and Waymouth, Robert M.
Angewandte Chemie. Oct 26, 2018, Vol. 130 Issue 44, p14793, 4 p.
Polymer industry -- Electric properties and Polymers -- Electric properties
Byline: , ,Daiki Umeyama,Andrey E. Rudenko,Hemamala I. Karunadasa,Robert M. Waymouth Keywords: Halbleiter; Mikroporose Materialien; N-Liganden; Polymere; Redoxchemie Abstract Reduction of the insulating one-dimensional coordination polymer [Cu(abpy)PF.sub.6].sub.n, 1a(PF.sub.6), (abpy=2,2'-azobispyridine) yields the conductive, porous polymer [Cu(abpy)].sub.n, 2a. Pressed pellets of neutral 2a exhibit a conductivity of 0.093 Scm.sub.-1 at room temperature and a Brunauer-Emmett-Teller (BET) surface area of 56 m.sub.2g.sub.-1. Fine powders of 2a have a BET surface area of 90 m.sub.2g.sub.-1. Cyclic voltammetry shows that the reduction of 1a(PF.sub.6) to 2a is quasi-reversible, indicative of facile charge transfer through the bulk material. The BET surface area of the reduced polymer 2 can be controlled by changing the size of the counteranion X in the cationic [Cu(abpy)X].sub.n. Reduction of [Cu(abpy)X].sub.n with X=Br (2b) or BAr.sub.F (2c; BAr.sub.F=tetrakis(3,5-bis(trifluoromethyl)phenyl)), affords [Cu(abpy)].sub.n polymers with surface areas of 60 and 200 m.sub.2g.sub.-1, respectively. Article Note: These authors contributed equally to this work. Supporting information: Additional Supporting Information may be found in the online version of this article As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. CAPTION(S): Supplementary
A dual catalysis system was developed to synthesize hydrolyzable polyether–polyester copolymers from propylene oxide and cyclic esters such as γ-butyrolactone, δ-valerolactone, and ε-caprolactone. A bimetallic chromium catalyst active for the enantioselective polymerisation of propylene oxide and an organocatalyst active for the ring-opening polymerisation of lactones were used in conjunction with an alcohol chain shuttling agent to create new copolymers. The monomer and alcohol ratios were varied to yield a wide range of copolymers with varying monomer ratios, molecular weights, and crystallinities. [ABSTRACT FROM AUTHOR]