Polynorbornene copolymers with pendent o-carborane and carbazole groups: Novel side-chain donor-acceptor copolymers for turn-on sensing of nucleophilic anions

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Vinyl-type polynorbornene copolymers with side-chain o-carborane (1-phenyl-o-carborane for P1-P3; 1-methyl-o-carborane for P4) and carbazole moieties were produced by vinyl addition copolymerization of norbornene monomers using a Pd(II) catalyst in combination with 1-octene chain transfer agent. The catalytic system provided well-defined copolymers with controlled incorporation of monomers. The copolymers possessed high thermal stability with high decomposition (T-d5 > 410 degrees C) and glass transition temperatures (T-g > 350 degrees C). Treatment of the closo-copolymers (P1-P4) with excess KOH in refluxing EtOH/THF led to degradation of the closo-carborane cage to produce nido-copolymers (nido-(P1-P4)). While P1-P3 exhibited a weak carbazole-based fluorescence, the corresponding nido-copolymers gave rise to a 2.0-3.6-fold increase in PL intensity depending on the comonomer content. An electrochemical study and comparative PL results of P4 and nido-P4 suggest that photoinduced charge transfer from carbazole donors to 1-phenyl-o-carborane acceptors was responsible for the weak fluorescence of P1-P3. (C) 2013 Elsevier Ltd. All rights reserved.
Publisher
ELSEVIER SCI LTD
Issue Date
2013-11
Language
English
Article Type
Article
Keywords

VINYL-TYPE POLYNORBORNENES; TRANSPORTING PROPERTIES; IRIDIUM(III) COMPLEXES; ICOSAHEDRAL CARBORANES; POLYHEDRAL BORANES; HOST MATERIALS; DERIVATIVES; ELECTROCHEMISTRY; CHEMISTRY; EMISSION

Citation

POLYMER, v.54, no.23, pp.6321 - 6328

ISSN
0032-3861
DOI
10.1016/j.polymer.2013.09.031
URI
http://hdl.handle.net/10203/188856
Appears in Collection
CH-Journal Papers(저널논문)
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