Organometallic Networks Based on 2,2‘-Bipyridine-Containing Poly( p -phenylene ethynylene)s
2005; American Chemical Society; Volume: 38; Issue: 9 Linguagem: Inglês
10.1021/ma0502147
ISSN1520-5835
AutoresAkshay Kokil, Peter Yao, Christoph Weder,
Tópico(s)Synthesis and Properties of Aromatic Compounds
ResumoConjugated polymers that comprise 2,2'-bipyridine moieties as part of the macromolecular backbone represent versatile precursors for the formation of conjugated metallo-supramolecular networks, which are readily accessible via ligand-exchange reactions. Poly{2,2'-bipyridine-5,5'-diylethynylene[2,5-bis(2-ethylhexyl)oxy-1,4-phenylene]ethynylene} (BipyPPE1) and a statistical copolymer comprising 5,5'-diethynyl-2,2'-bipyridine and 1,4-diethynyl-2,5-bis(alkyloxy)benzene moieties (BipyPPE2) were synthesized via the Pd0-catalyzed cross-coupling reaction of 1,4-diethynyl-2,5-bis(octyloxy)benzene, 1,4-bis[(2-ethylhexyl)oxy]-2,5-diiodobenzene, and 5,5'-diethynyl-2,2'-bipyridine. Complexation studies involving these polymers and a variety of transition metals suggest that ligand exchange leads to three-dimensional networks, which feature BipyPPE−metal−BipyPPE cross-links and display interesting optoelectronic properties. It is found that complexes with group 12 d10 ions (Zn2+ and Cd2+) are emissive, while other transition metals such as Cu+, Co2+, and Ni2+ form nonradiative metal-to-ligand charge-transfer complexes with the polymers.
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