An investigation of the binding of (S)-monothioBINOLate to rare earth metal cations

Two novel rare earth compounds have been synthesized using the previously reported (S)-MonoThioBINOL [(S)-H-2-MTB], (S)-2-hydroxy-2 '-mercapto-1,1 '-binaphthyl). We have shown here that while the H-bonded complex containing TMG-H+ (tetramethyl guanidium cation) maintains the structure that the analogous BINOLate complex adopts, the complex with lithium cations in the secondary coordination sphere crystallizes as an '-ate' complex with an outer sphere lithium counter cation solvated by DME.