Measurement of 195Pt chemical shift anisotropy in two solid Pt complexes, [Me3Pt(acetylacetonato)]2 and [Me3Pt]2SO4.4H2O. Effect on solution-state spin relaxation
Abstract
The anisotropy (Δσ) of the 195Pt chemical shielding for two PtIV complexes, [(Me)3Pt(acetylacetonato)]2 and [Me3Pt]2SO4.4H2O, measured by 1H–195 Pt cross-polarization techniques, is found to be of the order of 103 p.p.m. and hence of such a magnitude that a significant contribution of chemical-shift anisotropy relaxation to the 195Pt solution-state relaxation parameters T1 and T2 is evident at high magnetic fields.