Emission from a cationic cyclometalated iridium(III) complex, Delta- or Lambda-[Ir(ppy)(2)(dmbpy)](+) (Hppy: 2-phenylpyridine and dmbpy: 4,4'-dimethyl-2,2'-bipyridine), adsorbed on a colloidal saponite clay was quenched stereoselectively by chiral [Ru(acac)(3)] (acac: acetylacetonato) in a solution at the overall selectivity factor of K-SVo(Delta-Delta or Lambda-Lambda)/K-SVo(Delta-Lambda) = 1.84 in favor of the pseudo-enantiomeric pair between the emitter and the quencher.