35Cl, 93Nb, 181Ta, and 121Sb NQR in Cl5MV · OPCl3 (MV = Nb, Ta, Sb, or P) Complexes

Abstract

The behavior of 35Cl NQR spectra in Cl5M · OPCl3 complexes is affected by the nature of the metal center and the distortion of its surrounding geometry. In all cases considered, the 35Cl NQR frequencies in the OPCl3 fragment shift toward higher frequencies upon complex formation, whereas the frequencies of axial chlorine atoms in the Cl5M group in the phosphorus and antimony complexes lie below those for the equatorial atoms, and in the niobium and tantalum complexes, the frequencies of the axial atoms are higher than those of the equatorial ones.