APPLICATIONS OF 2-DIMENSIONAL P-31 CP/MAS NMR TECHNIQUES FOR STUDYING METAL PHOSPHINE COMPLEXES IN THE SOLID-STATE

The general utility of two-dimensional (2D) spin-echo correlation (SECSY), COSY, and homonuclear J-resolved P-31 CP/MAS NMR techniques in studying metal phosphine complexes in the solid state is discussed. The cross peaks in the P-31 2D CP/MAS SECSY and COSY correlation spectra provide valuable homonuclear J connectivity information, even when small J splittings are unresolved in standard 1D CP/MAS spectra. The homonuclear J-resolved experiment can be used to reveal small unresolved J couplings such as 2J(P,P)cis in square planar and octahedral transition-metal phosphines. The advantages of applying the 2D SECSY experiment in the solid state are discussed, and the results of the SECSY and COSY experiments are compared.