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The peculiarities of the  35 Cl,  79 Br NQR spectra of the chalcogenhalide complexes are explained in terms of intraspheric effect of ligands, formation of secondary intra-and intermolecular bonds, and electronic structure of metal atom. In the  35 Cl spectra of [TeCl 3  ] 2 [OsCl 6  ] 1, [SeCl 3 ] 2 [OsCl 6 ]2 and [TeCl 3 ] 2  [ReCl 6  ]3 the 7-10% increase in frequency in the low-frequency multiplet are accounted for by the disturbance of the p Hal -d M  π-interaction due to the formation of the peripheral coordination polyhedra [SeCl 6  ] and [TeCl 6  ]. The peculiarities of the  35  Cl and  79  Br spectra of [MoS 2  Cl 3  (SeCl 2 )] 2  4, [MoS 2  Br 3  (SeCl 2 )] 2  5, [WS 2 Cl 3  (SeCl 2 )] 2  6 and [WS 2  Br 3  (SeBr  2 )]  2  7 are attributed to the disturbance of the p Hal- d M  π-interaction under the influence of the coordination of the SeCl 2  and SeBr 2  ligands and formation of secondary intramolecular bonds. For [RhCl 3  (SeCl 2 ) 2 ] 2  8, [IrCl 3  (SeCl 2 ) 2 ] 2  9 and [SCl 3  ][IrCl 4  (SCl 2 ) 2 ]10, the appearance of frequencies at 25 MHz in low-frequency triplets is attributed to the intraspheric effect of weak donors-neutral SCl 2  and SeCl 2  molecules; the frequencies at 18 MHz are assigned to bridging chlorine atoms. This assignment was confirmed by the dimeric structure, which was established by an X-ray structure analysis.

Peculiarities of the 35 Cl and 79 Br NQR Spectra of Chalcogenhalide Complexes of Some Transition Metals