Rhenium diimine complexes structure

Fig. 18 The structure of rhenium(I) tricarbonyl diimine complex for anion sensing and the absorption spectral changes of this probe molecule (2.5 x 10 5 M) in CII )CN upon addition of n-Bu4NF, (a) [F ] = 0 - 2.8 x 10 5 M and (b) [F ] = 2.8 x 10 5 - 1.1 x 10 4 M. (reproduced with permission from [155])...

Photophysics of Rhenium(I) Diimine Complexes A. Electronic Structure of Rhenium(I) Diimine Complexes Photophysical Relaxation Process of Rhenium(I)... 

Fig. 1. Structures of rhenium(I) diimine complexes with abbreviations.

These complexes also usually exhibit substantial photostability under visible light irradiation and, due to their relatively long-lived triplet excited-state characteristics, the emission lifetimes are easily quenched by bimolecular electron- and/or energy-transfer processes in solution [6, 76], The electronic structures of MLCT excited molecules of diimine rhenium(I) tricarbonyl complexes can be viewed as a charge-separated species, [LRen(CO)3(diimine ")], with an essentially oxidized... 

When more conjugated diimine or pyridine ligands are used, the excited states of rhenium(I) carbonyl complexes can have substantial IL character. While the MLCT emission is often broad, with a lifetime in the submicrosecond to microsecond timescale, the IL emission usually has noticeable structural features, even in fluid solutions at ambient temperature. The emission lifetime is usually very long. A simple and widely applicable approach is to evaluate the ratio of the emission quantum yield and the emission lifetime (the product of the intersystem crossing efficiency and radiative decay-rate constant). Experimental values of... 

---