Photoluminescence Electron-Transfer Quenching of Rhenium(I) Complexes with Organic Sulfides |
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Authors: | M Rajkumar J Bhuvaneswari M Velayudham E Rajkumar S Rajagopal |
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Institution: | (1) School of Chemistry, Madurai Kamaraj University, Madurai, 625 021, India; |
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Abstract: | Electron-transfer(ET) from organic sulfides to excited state rhenium(I)-based heteroleptic tricarbonyl complexes Re(bpy)(CO)3(py)]+ (I) and Re(bpy)(CO)3(ind))]+ (II) in acetonitrile solution is facile and luminescence quenching constants, kq, are in the range 105–108 M−1s−1. The detection of the sulfide radical cation in this system using time-resolved absorption spectroscopy is a direct evidence
for the ET nature of the reaction. The kq values for the quenching of Re(I)-complexes with organic sulfides are analyzed with a scheme involving rate controlling electron
transfer process. The measured rate constants for the electron transfer (ET) reaction are close to the values calculated from
Marcus theory. |
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