CROSS-POLARIZATION MAGIC-ANGLE-SPINNING NUCLEAR-MAGNETIC-RESONANCE STUDY OF PLATINUM COMPLEXES CONTAINING THE CIS-P2PTC2 FRAGMENT

P-31 and Pt-195 cross-polarization magic-angle spinning nuclear magnetic resonance (CP-MAS NMR) spectra of three platinum complexes of formal oxidation state Pt(O) and Pt(II), respectively, are reported. Al three complexes, (Ph(3) P)(2) Pt(C2H4) (1), (Et(2) P-CH2-CH2-PEt(2))Pt(C equivalent to C-H)(2) (2) and (Ph(2)P-CH2-CH2-PPh(2))Pt(C equivalent to C-C(CH3)= CH2)(2) (3) contain the square-planar cis-P2PtC2 fragment and show unusual NMR spectroscopic properties insofar that the Pt-195 Shielding patterns are fairly narrow in relation to what one would generally have to expect for Pt-195 in square-planar coordination. Another unexpected NMR property of the cis-P2PtC2 fragment in 1-3 is the absence of spinning frequency-dependent second-order effects in this solid-state ABX spin system.