The study of coordination state for 1:1 molecular complexes of AsCl 3 and SbCI 3 with donors containing nitrogen or sulphur by means of NQR

Abstract

The 35Cl, 75As, and 121Sb NQR spectra of MCl 3L (M = As, Sb; L = trimethylamine, aniline, tmtu(1,1,3,3,-tetramethylthiourea), dmit(1,3-dimethyl-2(3H)-imidazoIethione) have been investigated. 35CI NQR signals were observed at room temperature in the separate regions of about 11 MHz, 15–16 MHz, and 23–25 MHz in AsCl 3L and 8.8 MHz, 13–14 MHz, and 17–20 MHz in SbCl 3L. 75As NQR lines were detected at 56–71 MHz in AsCl 3L. In SbCl 3L the nuclear quadrupole coupling constant of 121Sb is about 326 MHz and the asymmetry parameter is very small. The Zeeman effect on 35Cl and 121Sb NQR lines was examined for SbCl 3 · C 6H 5NH 2 at room temperature and the electric field gradient at the Sb atom and its small asymmetry parameter is discussed using the Townes—Dailey treatment.