Synthesis,characterization, and crystal structure of a new truly one-dimensional compound: PV2S10 |
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Authors: | R Brec G Ouvrard M Evain P Grenouilleau J Rouxel |
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Institution: | Laboratoire de Chimie des Solides, L.A. 279, 2, rue de la Houssinière, 44072 Nantes Cédex, France |
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Abstract: | PV2S10 was obtained by heating the elements in stoichiometric proportions at 490°C in evacuated Pyrex tubes. The crystal symmetry is monoclinic, space group , with the unit cell parameters a = 12.734(8)Å, b = 7.349(7)Å, c = 23.662(4)Å, β = 95°22(1), V = 2205(4)Å3, and Z = 8. The structure was solved from 2269 independant reflexions, and anisotropic least squares refinement gave R = 0.036 with 236 variables. The structure can be described as made of V2S12] units forming endless chains themselves linked, two by two, by PS4] tetrahedra. In these units each vanadium is surrounded by eight sulfur atoms (mean dVS = 2.459Å) arranged in a distorted bicapped triangular prism. Two of these prisms shared a rectangular face to form V2S12] groups, in which intercationic distances implied vanadium-vanadium bonds (mean dVV = 2.852(2)Å). Between the infinite double chains, only SS weak van der Waals' bonds exist. More than two thirds of the sulfur atoms are present as SS]?II pairs, (mean dSS = 2.015Å); the rest are S?II anions. |
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