High-resolution Tin-119 NMR of some solid organotin compounds

Abstract

High-resolution 119Sn NMR spectra were obtained for a number of solid organotin compounds using cross polarization, magic-angle spinning, and dipolar decoupling. Chemical-shift anisotropies range from about 40 ppm or less for tetrahedral tetraphenyltin to about 1100 ppm for polymeric di( n-octyl)tin maleate. For chlorine-containing compounds, a centerband pattern of two, relatively broad peaks is observed at low field (33.56 MHz). This pattern is attributed in part to the effect of the quadrupole moment of the directly bonded chlorine nuclei on the SnCl dipolar coupling. Spectra at high field (111.9 MHz) support this interpretation. Information on the number of crystallographically non-equivalent tin atoms is obtained in several cases and is correlated with available X-ray crystallographic and other spectroscopic data. The spectrum of triphenylin chloride at 111.9 MHz is considerably more complex than at 33.56 MHz and is not consistent with the published X-ray structure.