B. Coe, J. Harris, L. J. Harrington
Jun 9, 1998
Citations
0
Influential Citations
70
Citations
Quality indicators
Journal
Inorganic Chemistry
Abstract
The new compounds N-phenyl-4,4‘-bipyridinium (PhQ+), N-(4-acetylphenyl)-4,4‘-bipyridinium (4-AcPhQ+), and N-(2,4-dinitrophenyl)-4,4‘-bipyridinium (2,4-DNPhQ+), together with the known ligand N-methyl-4,4‘-bipyridinium (MeQ+), have been used to prepare a series of Ru(II) complex salts trans-[Ru(NH3)4(LD)(LA)](PF6)3 [LD = NH3 and LA = MeQ+ (1), PhQ+ (2), 4-AcPhQ+ (3), or 2,4-DNPhQ+ (4); LD = 4-(dimethylamino)pyridine (dmap) and LA = PhQ+ (7) or 4-AcPhQ+ (11); LD = 1-methylimidazole (mim) and LA = PhQ+ (8) or 4-AcPhQ+ (12); LD = 4-(dimethylamino)benzonitrile (dmabn) and LA = PhQ+ (9) or 4-AcPhQ+ (13); LD = phenothiazine (PTZ) and LA = PhQ+ (10) or 4-AcPhQ+ (14)]. These complexes display intense, visible metal-to-ligand charge-transfer (MLCT) absorptions, due to dπ(RuII) → π*(LA) excitations. The MLCT energy decreases as the acceptor strength of LA increases, in the order MeQ+ < PhQ+ < 4-AcPhQ+ < 2,4-DNPhQ+, and/or as the donor strength of LD increases, in the order PTZ < dmabn < NH3 < mim < dmap. X-ray cryst...