Krivovichev, S. V., Siidra, O. I., Nazarchuk, E. V., Burns, P. C. and Depmeier, W. (2006) Particular topological complexity of lead oxide blocks in Pb31O22X18 (X = Br, Cl). Inorganic Chemistry, 45 (10). pp. 3846-3848. DOI 10.1021/ic060166m.

Abstract

Dark-green platy crystals of the new compound Pb31O22Br10Cl8 (1) have been obtained by rapid quenching of a lead oxide halide melt. The structure of 1 (triclinic, P1, a = 12.1192(7)angstrom, b = 16.2489(10) angstrom, c = 18.3007(11) angstrom, alpha = 93.104(2)degrees, beta = 95.809(2)degrees, gamma = 111.252(1)degrees, V = 3325.4(3) angstrom(3), Z = 2) can be viewed as incorporation of [PbX6](4-) halide units (X = Br, Cl) into the defect PbO matrix. The latter represents a two-dimensional [O22Pb30](16+) cationic layer of OPb4 tetrahedra that can be derived from the [OPb] tetrahedral layer observed in tetragonal PbO. The layer consists of 22 symmetrically inequivalent OPb4 tetrahedra and represents the topologically most complicated arrangement of tetrahedra known to date.

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