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The Zeeman effect of 35Cl pure quadrupole resonance was studied on a single crystal of the 2SbCl3·C6H6 molecular complex at room temperature; it was found that the Cl–Sb–Cl bond angles of two nonequivalent SbCl3 molecules are 96.2°, 94.7°, 92.2°; 94.5°, 92.8°, and 95.2°, with an uncertainty of 1°. The asymmetry parameters for the six chlorine atoms were found to be 0.085±0.001, 0.055±0.004, 0.117±0.005, 0.119±0.005, 0.112±0.005, and 0.160±0.007, listed in the order of decreasing resonance frequencies. The bond character of the Sb–Cl bond was also calculated from the quadrupole coupling constant. It was found that the Sb–Cl bond corresponding to the lowest resonance lines in each nonequivalent SbCl3 molecule has a larger ionicity than the remainder. Moreover, the former has less of a temperature dependence than the latter. Finally, this complex may be assigned to the Ci or C1 symmetry class from the patterns of zero-splitting and from the intensity ratios of the multiplet of the spectrum.

The 63Cu nuclear quadrupole resonances have been observed in (CuX)nLm (X=Cl, Br, I; L=triphenylphosphine; n:m=1:1, 2:3, 1:2). Two characteristic frequency ranges were observed: the resonance frequencies of the three-coordinated Cu atoms are far above those of the four-coordinated.

(y=3, 4 and 5), were investigated by means of the nuclear quadrupole resonance (NQR) due to 35Cl and the Mossbauer effect due to 119Sn . The NQR-frequencies were observed at the temperature of liquid nitrogen and room temperature; they were found to range from 17.656 to 21.439MHz. The Mossbauer effect was investigated only at the temperature of liquid nitrogen; it resulted in isomer shifts ranging from 0.275 to 0.350mm/sec.The NQR-frequency and the isomer shift decreased with an increase in the number of water molecules in the hydrates, and the relationship between the NQR-frequency and the isomer shift was nearly linear. This relation was interpreted in terms of the transfer of the s-electrons of the tin atom to the chlorine atoms. Furthermore, it was revealed that there was a significant difference between the Sn-Cl bond of the hydrates and that of ammonium chlorostannate.It is well-known that tin(IV) chloride forms various hydrates but their structures have not been determined by any means except the Raman spectra.1) Tin(IV) chloride and its hydrates are suitable for investigating the Sn-Cl bond, since the electronic structures of the tin and chlorine atoms can be investigated by means of the Mossbauer effect due to 119Sn and the nuclear quadrupole resonance due to 35Cl.The molecular complexes of tin(IV) chloride with organic or inorganic compounds containing oxygen or nitrogen atoms have thus far investigated by means of NQR2,3) and the Mossbauer effect. [4][5][6][7][8]