Issue 87, 2014

Excited state electron transfer after visible light absorption by the Co(i) state of vitamin B12

Abstract

The first example of excited state electron transfer from cob(I)alamin is reported herein. Vitamin B12 was anchored to a mesoporous TiO2 thin film and electrochemically reduced to the cob(I)alamin form. Pulsed laser excitation resulted in rapid excited state electron transfer, ket > 108 sāˆ’1, followed by microsecond interfacial charge recombination to re-form cob(I)alamin. The supernucleophilic cob(I)alamin was found to be a potent photoreductant. The yield of excited state electron transfer was found to be excitation wavelength dependent. The implications of this dependence are discussed.

Graphical abstract: Excited state electron transfer after visible light absorption by the Co(i) state of vitamin B12

Supplementary files

Article information

Article type
Communication
Submitted
25 Mar 2014
Accepted
14 Jul 2014
First published
17 Jul 2014

Chem. Commun., 2014,50, 13304-13306

Author version available

Excited state electron transfer after visible light absorption by the Co(I) state of vitamin B12

D. Achey, E. C. Brigham, B. N. DiMarco and G. J. Meyer, Chem. Commun., 2014, 50, 13304 DOI: 10.1039/C4CC02221A

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