G. K. Semin

Nuclear quadrupole resonance spectra of121Sb,123Sb and35Cl of SbCl5·O(CH2Cl)2 complexes

1. A study was made of the35Cl,121Sb and123Sb NQR spectra and the NMR spectrum of the SbCl5 ·O(CH2Cl)2 complex. 2. Complex formation occurs via the oxygen atom, in which connection the antimony atom in the complex has an octahedral coordination.

A 35Cl nuclear quadrupole resonance study of the cis-trans isomerism of tin tetrachloride complexes

On the basis of MO calculations and n.q.r. spectra of SnCl4·2D a dependence of frequency splittings and shifts on cis-trans isomerism has been found.

Spectral manifestations of intramolecular interactions in acid chlorides of unsaturated acids of phosphorus

The mutual effect of atomic groups in acid chlorides of threeand four-coordination phosphorus was investigated by the nuclear quadrupole resonance of Cl35 (NQR Cl35) and Raman spectroscopy methods. On the basis of the NQR data it is suggested that in the ground state the interaction of unshared pairs of chlorine with the d orbitals of phosphorus is displayed weakly and the interaction of the indicated atoms is accomplished predominantly by an inductive mechanism. The integral intensities of the Raman lines of vibrations of the P-Cl and P=Cl bonds were measured. The Raman scattering data and the results of quantummechanical calculations by the molecular orbital method indicate some additional multiplicity of the P-Cl bond.

Cl35 nuclear quadrupole resonance spectra of some organotin chlorides

1. The Cl35NQR spectra of some organotin chlorides were investigated. 2. The dependence between the Cl35NQR frequencies and the quadrupole splitting constants of Sn119 in the Mossbauer spectra was obtained. 3. The electron structures of the investigated compounds were discussed.

NQR spectra of Cl35 in complexes of stannic chloride with monochlorodimethyl ether and benzyl chloride

The NQR spectra of Cl35 of complexes (1:2) of stannic chloride with monochlorodimethyl ether and benzyl chloride were investigated. Both complexes have an octahedral structure with a cis-arrangement of the donor molecules.

NQR spectra of Bi209 in complexes of BiCl3 with p-donors

1. The NQR spectra of Bi209 in complexes of BiCl3 with diethyl ether, anisole, acetone, and acetonitrile were investigated. 2. The investigated complexes are comparatively weak. 3. Changes in the quadrupole interaction constants and the parameters of the asymmetry in the series of these complexes depend to a substantial degree on the geometrical structure of the complexes.

Investigation of cis-trans-isomerization of complexes of stannic chloride with n-donors by the NQR method

1. The shape of the NQR spectra of octahedral complexes of halides of metals of group IV with n-donors was considered by the molecular orbital method. The shifts of the NQR frequencies and the nature of the splitting of the NQR spectra of cis- and trans-isomers differ. The large splitting of the spectrum of the cis-isomer is due to the chemical nonequivalence of the axial and equatorial halogen atoms. 2. The NQR spectra of a number of complexes of stannic chloride with n-donors were investigated. On the basis of the nature of the splittings of the spectra, a number of conclusions were drawn on cis-transisomerism in the investigated compounds. The possibility of determining the composition and structure of the complexes by the NQR method was demonstrated.

Br79 and Br81 NQR spectra of aluminum bromide complexes with some p-donors

1. The Br79 and Br81 NQR spectra of five aluminum bromide complexes with some p-donors were investigated. 2. The direction of the quadrupole frequency shifts in these complexes is caused by a charge transfer. The magnitude of the shift is determined by the extent of the charge transfer. 3. The steric factor leads to a high-frequency shift of the NQR lines, and also the large splitting in the spectra.