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- W2116700076 abstract "A series of paramagnetic clusters of the composition [(Ta6Cl12)Cl(H2O)5][HgX4] · 9H2)O (X = Cl, Br, I) has been prepared by the reaction of [Ta6Cl12]3+ methanol-water solutions with HgX2 and NaX halides. The structure of [(Ta6Cl12)Cl(H2O)5][HgBr4] · 9H2O has been solved by X-ray diffraction in the cubic space group Fd 3m. Crystal data: a = 20.036(2) Å, V = 8043.0(1) Å3, Z = 8, R = 0.048 (Rw = 0.051). The structure is composed of an octahedral [(Ta6Cl12)Cl(H2O)5]2+ cluster cation, tetrahedral [HgBr4]2− anion and crystal water molecules. The 2mm symmetry of the octahedron is reduced by the statistical distribution of the five water molecules, O(1), and chlorine, Cl(2), at the terminal coordination sites. Thus, the distances Ta-O(1) and Ta-Cl(2) are averaged to the value of 2.32(2) Å. The Ta-Ta and Ta-Cl(1) bond distances are 2.911(1) Å and 2.440(3) Å, respectively, whereas the Hg-Br bond distance is 2.564(3) Å. The cluster [(Ta6Cl12)Cl(H2O)5][HgBr4] · 9H2O is semiconducting with two levels governing conductivity with respective activation energies, Eal = 0.24 eV and Ea2 = 0.17 eV." @default.
- W2116700076 created "2016-06-24" @default.
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- W2116700076 date "1999-10-01" @default.
- W2116700076 modified "2023-10-17" @default.
- W2116700076 title "Reaction of hexanuclear niobium and tantalum halide clusters with mercury(II) halides. II. Semiconducting compounds with [Ta6Cl12]3+ unit" @default.
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- W2116700076 doi "https://doi.org/10.1016/s1293-2558(00)80101-6" @default.
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