1977 Volume 50 Issue 12 Pages 3136-3139
The quadrupole coupling constants (e2Qq⁄h) and the principal axes of electric field gradient (efg) at 81Br, 127I, 27Al, 121Sb, and 209Bi in AlBr3·SbBr3, AlI3·SbI3, and AlBr3·BiBr3 were determined by means of NQR or NMR, in order to clarify the structures and chemical bonds of these compounds. The NQR spectra of AlBr3·SbBr3 and AlI3·SbI3 resemble each other and these two compounds consist of V-shaped SbX2+ and distorted tetrahedral AlX4− ions (X=Br and I). However, there are weak bonds between the Sb atom in SbX2+ and the halogens in AlX4− ion. The V-shaped SbX2+ has the bond angle 97.3° for the bromide and 99.0° for the iodide. The orientation of the efg axes at the 121Sb atom suggests that the antimony atom has a lone pair of electrons in the opposite direction to the bisector of the two Sb–X bonds. On the other hand, only one terminal bromine atom bonded to the Bi atom was found for AlBr3·BiBr3.
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