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metal-organic compounds
The {Ge9O14(OH)12}4- cluster contains a central GeO6 octahedron corner-linked to four GeO4 tetrahedra, which are in turn corner-linked to an adjacent tetrahedron and a GeO5 trigonal bipyramid. Each of the four trigonal bipyramids shares a common edge with another, and one vertex of each edge is connected to the central octahedron.