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Chemistry |
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Authors: Roberto Köferstein, Christian Robl
Monoclinic single crystals of Ba2(H2O)[µ10-C6H2(COO)4] (1) and Pb2(H2O)[µ10-C6H2(COO)4]*H2O (2) have been obtained using the silica gel method. Space group C2/c (no. 15), Z = 4; 1: a = 780.89(4), b = 1756.19(8), c = 914.80(5) pm, beta= 114.512(5)°; 2: a = 756.70(10), b = 1772.8(2), c = 890.2(2) pm, beta= 113.590(10)°. There are two crystallographically independent M2+ ions (M = Ba, Pb). M(1) is surrounded by eight carboxylate oxygen atoms and one water molecule forming a tricapped trigonal prism. M(2) is coordinated by ten carboxylate oxygen atoms in the shape of a tetracapped octahedron. The connection between the M(1) and M(2) polyhedra leads to infinite layers parallel to (010) which are linked by [C6H2(COO)4]4- anions to form a three-dimensional framework. The [C6H2(COO)4]4- anion adopts a µ10 coordination mode. Compound 1 reveals short Ba-Ba contacts of 426.46(2) pm, whereas the Pb-Pb distance of 411.01(6) pm in 2 is larger than twice the van der Waals radius.
Comments: 8 Pages. The paper was published in: Z. Anorg. Allg. Chem. 641 (2015) 1150—1155. (DOI: 10.1002/zaac.201500050)
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