Asymmetric Elelctron Transfer from a Chiral Ruthenium Complex Donor to an Atropisometric Chiral 2,2'-Bipyridine Acceptor

Article abstract of DOI:10.1021/j100038a058

We report asymmetric light-induced electron transfer (ET) in water in the system (Λ)-Ru(methylvinylbipyridine)3²⁺/(+)- and (-)-1,1'-tetramethylene-2,2'-bipyridine-3,3'-dicarboxylic acid at pH => 5 (zwitterionic form).This reaction is activation controlled; ΔG⁰ was made nearly zero by manipulation of molecular structure, pH, and solvent.Then reverse ET to the excited donor occurs which renders the quenching reaction asymmetric.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.