Asymmetric Electron Transfer from a Chiral Ru Complex Donor to an Atropisomeric Chiral 2,2'-Bipyridine Acceptor

Publication Type
Journal contribution
Authors
Woerner, M.; Greiner, G.; Rau, H.
Year of publication
1995
Published in
J. Phys. Chem.
Band/Volume
99/38
Page (from - to)
14161-6
Abstract

We report asym. light-induced electron transfer (ET) in water in the system (.LAMBDA.)-Ru(methylvinylbipyridine)32+/(+)- and (-)-1,1'-tetramethylene-2,2'-bipyridine-3,3'-dicarboxylic acid at pH .gtoreq. 5 (zwitterionic form). This reaction is activation controlled; .DELTA.G.degree. was made nearly zero by manipulation of mol. structure, pH, and solvent. Then reverse ET to the excited donor occurs which renders the quenching reaction asym. The asymmetry of ET is small as expected for high-DK solvents. From our results we infer that chiral recognition takes place in a diastereomeric exciplex.

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