Solid-state carbon-13 nuclear magnetic resonance spectra of selected metal carboxylate complexes

Abstract

Eight anhydrous metal carboxylate complexes have been studied in the solid state by ¹³C cross-polarization magic-angle-spinning n.m.r. spectroscopy. A general assignment of the ¹³C n.m.r. spectra can be made by comparing the data obtained with definitive structural data previously reported in single-crystal X-ray crystallographic studies. Although a complete assignment of all n.m.r. peaks has not been achieved, the results highlight the important parameters involved and demonstrate that in many cases definitive structural data can be deduced for these complexes in the solid state using n.m.r. spectroscopy. Metal carboxylates are excellent compounds for a comparative study because of the very high quality of the solid-state spectra produced. A crystallographic splitting of 8 Hz can be seen clearly in some spectra. The chemical shift is very sensitive to the precise crystallographic environment.