Abstract
Synthesis and X-ray diffraction study of [UO2CrO4(C5NH5COO)] · H2O crystals were performed. The compound crystallizes in the monoclinic system with the unit cell parameters a = 7.5025(3) A, b = 11.5188(6) A, c = 13.0518(6) A, β = 97.877(4)°, V = 1117.29(9) A3, space group P21/n, Z = 4, R = 0.0263. The structure is formed by three [UO2CrO4(C5NH5COO)] layers parallel to (10\(\bar 1\)). The coordination polyhedron of uranium atoms is a pentagonal bipyramid, whose apices are occupied by oxygen atoms of uranyl, three chromate groups, and two molecules of isonicotinic acid. Crystal chemical formula of the [UO2CrO4(C5NH5COO)] layer can be represented as AT3B2, where A = UO22+, T3 = CrO42−, and B2 = C5NH5COO molecules. The isonicotinic acid molecules are in the form of zwitterions.
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