Electron Delocalization in a Ruthenium(II) Bis(2,2‘:6‘,2‘ ‘-terpyridyl) Complex

Autor:	Glen M. Chapman, Anthony Harriman, Andrew C. Benniston, Maryam Mehrabi, Craig A. Sams
Rok vydání:	2004
Předmět:	Chemistry Stereochemistry Substituent chemistry.chemical_element Photochemistry Ruthenium Inorganic Chemistry chemistry.chemical_compound Fluid solution Yield (chemistry) Radiative transfer Physical and Theoretical Chemistry Triplet state Luminescence Ground state
Zdroj:	Scopus-Elsevier
ISSN:	1520-510X 0020-1669
Popis:	Photophysical properties have been recorded for a ruthenium(II) bis(2,2':6',2' '-terpyridine) complex bearing a single ethynylene substituent. The target compound is weakly emissive in fluid solution at room temperature, but both the emission yield and lifetime increase dramatically as the temperature is lowered. As found for the unsubstituted parent complex, the full temperature dependence indicates that the lowest-energy triplet state couples to two higher-energy triplets and to the ground state. Luminescence occurs only from the lowest-energy triplet state, but the radiative and nonradiative decay rates indicate that electron delocalization occurs at the triplet level. Comparison of the target compound with the parent complex indicates that the ethynylene group reduces the size of the electron-vibrational coupling element for nonradiative decay of the lowest-energy triplet state. Although other factors are affected by substitution, this is by far the most important feature with regard to stabilization of the triplet state.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f8740ed566b04db4b2a3981f8df7eac6 https://doi.org/10.1021/ic035380e Zobrazit plný text záznamu