M2(H2O)[μ10-C6H2(COO)4] (M= Ba2+, Pb2+) - Two Isotypic 3-Dimensional Coordination Polymers

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Paper: https://www.researchgate.net/publication/274320936_M2H2Om10-C6H2COO4_M_Ba2_Pb2_-_Two_Isotypic_Three-Dimensional_Coordination_Polymers_with_a_Layer-like_Separation_between_Anions_and_Cations Abstract: Monoclinic single crystals of Ba2(H2O)[μ10-C6H2(COO)4] (1) and Pb2(H2O)[μ10-C6H2(COO)4] (2) were 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.

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