TRISPHAT salts. Efficient NMR chiral shift and resolving agents for substituted cyclometallated ruthenium bis(diimine) complexes

The determination of the enantiomeric purity of monocationic ruthenium(II) cyclometallated complexes is easily carried out by 1H-NMR analysis using a TRISPHAT salt as a diamagnetic chiral shift reagent. Resolution of the organometallic complexes can be conveniently carried by preparative thin layer chromatography using TRISPHAT as a chiral counter-ion.