We report asymmetric light-induced electron transfer (ET) in water in the system (A)-Ru(methylvinylbipyridine)(3)(2+)/(+)- and (-)-1,1’-tetramethylene-2,2’-bipyridine-3,3’-dicarboxylic acid at pH greater than or equal to 5 (zwitterionic form). This reaction is activation controlled; Delta G degrees 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.