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 Pt^IV 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.