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Optical Activity and Lifetime Measurements of Tris‐(2,2′‐Bipyridine) Ruthenium (II) Bromide: Evidence for some Singlet‐Singlet Emission
Author(s) -
Gafni Ari,
Steinberg Izchak Z.
Publication year - 1976
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.197600021
Subject(s) - chemistry , photochemistry , ruthenium , phosphorescence , excited state , singlet state , anisotropy , fluorescence , fluorescence anisotropy , bromide , stokes shift , luminescence , emission spectrum , absorption (acoustics) , wavelength , molecular physics , analytical chemistry (journal) , spectral line , atomic physics , optics , inorganic chemistry , physics , membrane , catalysis , biochemistry , chromatography , astronomy
Evidence for some emission from the first excited singlet state of tris‐(2,2′‐bipyridine) ruthenium (II) bromide is presented based on circular dichroism, circular polarization of luminescence and fluorescence decay measurements. The anisotropy factors in absorption and emission assume very similar values in the wavelength region where these two spectra overlap. Moreover, the two anisotropy factors change markedly in this wavelength range indicating the existence of a second emission band at the short wavelength edge of the main phosphorescence band of the chelate. This observation is further supported by fluorescence decay measurements which reveal biexponential decay kinetics with a fast decaying component at the short wavelength edge of the emission.