Isotope Effects on the Picosecond Time-Resolved Emission Spectroscopy of Tris(2,2'-bipyridine)ruthenium (II)

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• 作者：Wesley R. Browne ; Colin G. Coates ; Clare Brady ; Pavel Matousek ; Michael Towrie ; Stanley W. Botchway ; Anthony W. Parker ; Johannes G. Vos ; and John J. McGarvey
• 刊名：Journal of the American Chemical Society
• 出版年：2003
• 出版时间：February 19, 2003
• 年：2003
• 卷：125
• 期：7
• 页码：1706 - 1707
• 全文大小：56K
• 年卷期：v.125,no.7(February 19, 2003)
• ISSN：1520-5126

文摘

The excited-state properties of the transition metal complexes tris(2,2'-bipyridine) ruthenium(II) and tris(4,7-diphenyl-1,10-phenanthroline) ruthenium(II) are examined using picosecond time-resolved luminescence spectroscopy. For both complexes, direct observation of a short-lived high-energy emission with a lifetime of less than 4 ps is reported. Upon deuteriation of the complexes the lifetime of the high-energy emission shows a marked increase with a biexponential decay (20 and ~300 ps components). Examination by time-resolved excited-state resonance Raman shows that for the perprotio complexes features attributable to the ³MLCT excited state are formed within 4 ps, while for the perdeuterio a rise time of ~ 20 ps is observed in the ³MLCT features. The results indicate that the emission in both cases may be ¹MLCT in origin and are discussed with respect to heterogeneous electron transfer.