Premium
Luminescence quenching of partially quaternized poly(1‐vinylimidazole)‐bound ruthenium(II) complex in methanol
Author(s) -
Suzuki Masahiro,
Mori Yoshiaki,
Yokoyama Naoki,
Kimura Mutsumi,
Hanabusa Kenji,
Shirai Hirofusa
Publication year - 1997
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1997.021980404
Subject(s) - chemistry , quenching (fluorescence) , steric effects , alkyl , polymer chemistry , ruthenium , side chain , photochemistry , polymer , luminescence , organic chemistry , fluorescence , catalysis , materials science , physics , optoelectronics , quantum mechanics
Metallopolymers in which bis(2,2′‐bipyridine)ruthenium(II) complexes are coordinated to imidazolyl residues on partially quaternized poly(1‐vinylimidazole) having different degree of quaternization (RuQPIm) were synthesized. The luminescence quenching of the photoexcited RuQPIms with various alkylviologens having different length of alkyl group was investigated in MeOH. In quenching of RuQPIm with methylviologen (MV 2+ ), the efficiency of quenching decreases with increasing degree of quaternization. This was attributed to the electrostatic repulsion between the MV 2+ species and the quaternized imidazolium residue on the polymer backbone and steric hindrance of the alkyl side chain. Furthermore, the efficiency of quenching depends on the length of the alkyl group in viologen. These results suggest that the alkyl side chain on the polymer backbone exerts steric hindrance at low degree of quaternization and van der waals interaction at high degree of quaternization.