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Journal of Structural Chemistry

2010 year, number 3

[Rh(NH3)5Cl]WO4 CRYSTAL STRUCTURE

S. P. Khranenko, E. A. Shusharina, A. I. Smolentsev, P. E. Plyusin, S. A. Gromilov
Keywords: tungsten, rhodium, complex salt, crystal chemistry, single crystal X-ray diffraction analysis, thermal analysis
Pages: 601-604

Abstract

At T 150 K the crystal structure of [Rh(NH3)5Cl]WO4 is studied: a = 11.2374(4) Å, b = 8.4857(3) Å, c = 10.5326(3) Å, V = 1004.36(6) Å3, space group Pnma, Z = 4, dx = 3.117 g/cm3. In the structure, complex ions are bound by N-H…O hydrogen bonds, with the shortest ones of 2.85-2.94 Å. Ionic packing is shown to be considered as rhombohedral with at ≈ 5.26 Å, αt ≈ 106°. Thermal properties of the salt are studied in the hydrogen atmosphere. The product of thermal decomposition at 750°C is a mixture of three solid solutions of RhxW1-x based on fcc, bcc, and hcp structures. All the obtained phases are nanocrystalline. The sizes of coherent scattering regions are 10-12 nm.