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Heteroleptic Ruthenium(II) Complex‐Containing Polymers and Their Bandgap Tuning and Photosensitizing Properties
Author(s) -
Cheung Wai Kei,
Mak Chris S. K.,
Chan Wai Kin
Publication year - 2012
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201100756
Subject(s) - ruthenium , stille reaction , polymer , ligand (biochemistry) , photochemistry , materials science , band gap , thiocyanate , delocalized electron , polymer chemistry , denticity , polymerization , absorption (acoustics) , metal , chemistry , inorganic chemistry , organic chemistry , optoelectronics , catalysis , biochemistry , receptor , composite material
A new synthetic route to novel ruthenium‐containing polymers is reported. [Ru(L)(L′)Cl 2 ] type complexes (L and L′ = bidentate N^N ligands) with a dibromo‐substituted ligand were polymerized by Stille cross‐coupling reaction. The subsequent displacement of chloride ligands by thiocyanate was highly effective and the structures of the target polymers were fully characterized. The main chain absorption showed a significantly red‐shift upon metal coordination and the metal‐to‐ligand charge transfer (MLCT) band of the complex enhanced the photon harvesting ability of the polymer. The extent of π‐electron delocalization of the ancillary ligands also showed interesting effects on the electronic properties of the polymers. The photosensitizing and bandgap tuning properties of these Ru(II) complexes demonstrated a new avenue to develop new classes of optoelectronic materials.