One-dimensional inorganic arrangement in the bismuth oxalate hydroxide Bi(C2O4)OH

摘要

Single crystals of Bi(C2O4)OH were obtained by the slow diffusion of Bi3+ cations through silica gel impregnated with oxalic acid. The structure was solved in the Pnma space group with a = 6.0853(2) angstrom, b = 11.4479(3) angstrom, c = 5.9722(2)angstrom, leading to R = 0.0188 and wR = 0.0190 from 513 unique reflections. The bismuth coordination polyhedron is a BiO6E pentagonal bipyramid with the lone pair E sitting at an axial vertex. The opposite axial vertex is occupied by a hydroxyl oxygen atom, which is also an equatorial corner of a neighboring BiO6E bipyramid. The sharing of the hydroxyl oxygen atoms build (1)(infinity)[BiO5E] zig-zag chains running down the [100] direction. These chains are aligned in a sheet parallel to the (010) plane and are further connected through oxalate ions to form a three-dimensional arrangement. On heating, Bi(C2O4)OH decomposes to the meta-stable quadratic beta-Bi2O3 phase. (c) 2008 Elsevier Inc. All rights reserved.