Photophysical Properties of Ruthenium(II) Tris(2,2‘-bipyridine) Complexes Bearing Conjugated Thiophene Appendages

Autor:	Anthony Harriman, and Antoinette De Nicola, Sébastien Goeb, Raymond Ziessel, Guillaume Izzet
Rok vydání:	2006
Předmět:	Ligand chemistry.chemical_element Conjugated system Photochemistry 2 2'-Bipyridine Ruthenium Inorganic Chemistry Bipyridine chemistry.chemical_compound Reaction rate constant chemistry Thiophene Butyronitrile Physical and Theoretical Chemistry
Zdroj:	Inorganic Chemistry. 45:9729-9741
ISSN:	1520-510X 0020-1669
DOI:	10.1021/ic060921w
Popis:	A small series of ruthenium(II) tris(2,2'-bipyridine) complexes has been synthesized in which ethynylated thiophene residues are attached to one of the 2,2'-bipyridine ligands. The photophysical properties depend on the conjugation length of the thiophene-based ligand, and in each case, dual emission is observed. The two emitting states reside in thermal equilibrium at ambient temperature and can be resolved by emission spectral curve-fitting routines. This allows the properties of the two states to be evaluated in both fluid butyronitrile solution and a transparent KBr disk. It is concluded that both emitting states are of metal-to-ligand charge-transfer (MLCT) character, and despite the presence of conjugated thiophene residues, there is no indication for a low-lying pi,pi*-triplet state that promotes nonradiative decay of the excited-state manifold. A key feature of these systems is that the conjugation length imposed by the thiophene-based ligand helps to control the rate constants for both radiative and nonradiative decay from the two MLCT triplet states.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6e4f5cb34dcbf03041e2297cef731325 https://doi.org/10.1021/ic060921w Zobrazit plný text záznamu