Abstract
Tetraphenylbismuth aroxides Ph4BiOAr (Ar = C6H3Cl2-2,6, C6H2(Br2-2,6)(t-Bu)-4, C6H2(Br2-2,6)(NO2)-4 · 1/2C6H6, C6H3(NO2)2-2,4, C6H2(NO2)3-2,4,6) were synthesized in the yield up to 90% by the reaction of pentaphenylbismuth with phenols and triphenylbismuth diaroxides and studied by X-ray diffraction. The Bi atoms of tetraphenylbismuth aroxides have a distorted trigonal-bipyramidal coordination with the axial O atom of the aroxide group. The axial angles CBiO vary from 171.7(2)° to 179.3(3)°. The distances Bi-O change in the interval 2.453(2)–2.925(7) Å depending on the nature of substituents in the aromatic ring of the phenol residue. The increasing distance Bi-O in the series of compounds under study correlates with the tendency of the BiC4 fragment to form the tetrahedral configuration.
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