Spectroscopy and photophysics of chloro-bis-bipyridyl complexes of ruthenium(II) with pyridine ligands

Autor:	S. V. Litke, T. V. Mezentseva, G. N. Lyalin, A. Yu. Ershov
Rok vydání:	2003
Předmět:	Pyrazine Chemistry chemistry.chemical_element Medicinal chemistry Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Ruthenium chemistry.chemical_compound Reaction rate constant Excited state Pyridine Isonicotinamide Spectroscopy Luminescence
Zdroj:	Optics and Spectroscopy. 95:917-924
ISSN:	1562-6911 0030-400X
DOI:	10.1134/1.1635477
Popis:	The absorption, luminescence, and luminescence excitation spectra of ruthenium(II) complexes cis-[Ru(bpy)2(L)Cl]+[bpy=2,2′-bipyridyl; L=NH3, pyrazine, pyridine, 4-aminopyridine, 4-picoline, isonicotinamide, 4-cyanopyridine, 4,4′-bipyridyl, or trans-1,2-bis(4-pyridyl)ethylene] in alcoholic (4: 1 EtOH-MeOH) solutions are studied. At 77 K, the quantum yields and decay times of the luminescence of the complexes are measured and the deactivation rate constants of the lowest electronically excited metal-to-ligand charge transfer state (3MLCT) are determined. The linear correlation between the energy of the lowest state 3MLCT d π(Ru)>π*(bpy) of the cis-[Ru(bpy)2(L)Cl]+ complexes and the parameter pKa of the free 4-substituted pyridines and pyrazine used as ligands is established.
Databáze:	OpenAIRE
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