Solid-state nuclear magnetic resonance study of a series of phosphonic and phosphinic acids

Abstract

High-resolution ³¹P and ¹³C n.m.r. spectra have been obtained for 18 solid phosphonic and phosphinic acids under conditions of high-power de-coupling, cross-polarization and magic-angle spinning. The results yield crystallographic information about the size of the asymmetric unit and are consistent with the limited number of available diffraction studies. ³¹P Shielding tensor components determined from static and slow-spinning MAS spectra are given for a number of the compounds. The shielding data support general assumptions regarding the form of the phosphonic acid group.