Chlorine and Antimony Nuclear Quadrupole Resonance in SbCl5CH3CN, SbCl5POCl3, and SbCl5

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Abstract
Nuclear quadrupole resonances due to 121Sb, 123Sb, Cl35, and 37Cl have been observed in SbCl5POCl3, SbCl5CH3CN, and SbCl5 at a number of temperatures. The resonances in SbCl5POCl3 are correlated with the known structure of that complex. A covalent structure for the SbCl5CH3CN complex is proposed on the basis of its resonances. A phase change in SbCl5 occurs between 195° and 210°K. At 210°K and above the Sb resonances are consistent with a trigonal bipyramidal structure and the chlorine resonances are not visible. At 195°K and below the resonances of Sb and Cl indicate a complex structure. A bridged dimeric structure similar to that in NbCl5 is suggested. A discussion of relative intensity measurements is included. A qualitative discussion of the temperature dependences and their implications on the molecular dynamics of these molecules is also included.

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