Abstract
Abstract The optical resolution of [Pt(NH3)2(N1-Me-(S)-pn)]Cl2 is effected by using silver di-μ-(+)-tartrato(4−)-bis(antimonate(III)) (Ag2[Sb2(+)-tart2]) as the resolving agent. X-Ray structure analysis of the less soluble diastereoisomeric salt, (+)350-[Pt(NH3)2(N1-Me-(S)-pn)][Sb2(+)-tart2]·H2O, revealed that the asymmetric secondary nitrogen is of the R configuration. The crystal is orthorhombic, with a P212121 space group, a=19.302(7) Å, b=14.791(4) Å, c=7.925(2) Å, and Z=4. The structure was determined from counter intensity data and refined to R 0.049 using the least-squares method for 1955 independent non-zero reflections. The Pt atom has a square-planar coordination with 4 N atoms and both the N–CH3 and C–CH3 groups are equatorial with respect to the chelate ring. The circular dichroism spectrum of R-[Pt(NH3)2(N1-Me-(S)-pn)](ClO4)2, which was obtained from the less soluble di-μ-(+)-tartrato(4−)-bis(antimonate(III)) salt, is presented and discussed on the basis of the distribution of the possible conformers, the relative abundances of which were infered from 13C NMR data.
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