The 31P solid state NMR studies of ZrP, Mg3P2, and CdPS3

The 31P solid state NMR spectra of ZrP, Mg3P2, MgP4, and CdPS3 are reported. Static and magic angle spinning (MAS) spectra were obtained for each compound. In all cases, chemical shift anisotropy and the effects of dipolar broadening were sufficiently reduced by the MAS method to reveal the isotropic chemical shifts for each crystallographically distinct phosphorus. The observed resonances were assigned to the different types of phosphorus by considering the structural details of each compound. In ZrP the two chemical shifts of +128.4 and +187.5 ppm (relative to 85 percent H3PO4) were assigned to P occupying the Wyckoff 2d and 2a sites, respectively. In Mg3P2, two resonances from the 24d and 8a site P atoms were observed at -262.3 and -239.6 ppm, respectively. In MgP4 two types of phosphorus, one type coordinated to two Mg and two P and the other to three P and one Mg, gave chemical shifts of -109.2 and -6.1 ppm, respectively. From CdPS3 only one resonance at +104.9 ppm is observed as all P atoms are crystallographically equivalent.