Intersystem-Crossing Dynamics in Heterodinuclear Polypyridyl-Bridged Complexes

Autor:	Vaidhianathan Swayambunathan, Andrea W. Wallace, John F. Endicott, John D. Petersen, Silvia Ronco, Jiunn-Shyong Hsiao, Jon R. Schoonover, David W. Thompson
Rok vydání:	1997
Předmět:	chemistry.chemical_compound Crystallography Intersystem crossing Pyrazine chemistry Picosecond Flash photolysis Physical and Theoretical Chemistry Absorption (chemistry) Nanosecond Luminescence Excitation
Zdroj:	The Journal of Physical Chemistry A. 101:8152-8156
ISSN:	1520-5215 1089-5639
DOI:	10.1021/jp971726t
Popis:	The excited-state properties of [(L)4MII(dpp)RuII(bpy)2](PF6)n (bpy = 2,2‘-bipyridine; dpp = (2,3-bis(2-pyridyl)pyrazine); (L)4MII = (NH3)4RuII (n = 4) or (CN)4FeII (n = 0)) have been investigated by steady-state and time-resolved picosecond and nanosecond transient luminescence and absorption spectroscopic methods. The [(NH3)4RuII(dpp)RuII(bpy)2]4+* complex is nonemissive in room-temperature H2O solution. Picosecond laser flash photolysis of [(NH3)4RuII(dpp)RuII(bpy)2]4+ reveals the formation of a transient species that decays exponentially (τ = 290 (±80) ps) independent of excitation wavelength. The excited-state behavior of [(NC)4FeII(dpp)RuII(bpy)2]* display a complicated dependence on excitation wavelength. Following 591-nm pulsed laser excitation into the 1[(dπ) (π*) ] ← 1[(dπ) ] metal-to-ligand charge transfer (MLCT) band, a short-lived transient is formed with τ 200 ns. One...
Databáze:	OpenAIRE
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