Tunable chiral induction and complete determination of chirality in a dinuclear triple helicate, [Ga(2)1(3)](6-) (1 = N,N ' -bis(2,3-dihydroxybenzoyl)-1,4-phenylenediamine, an achiral ligand) is achieved by the use of a chiral counterion. The counterion, (S)-N-methylnicotinium (s-nic), has stereospecific interactions with the helicate. The energy difference, DeltaG, between the Lambda Lambda and Delta Delta helicates in the asymmetric environment afforded by enantiopure s-nic is about 1.1 (+/-0.2) kcal/mol.