A dynamic disorderlinked reversible phase transition in a new chloroform solvate of cisdichloridobis(triethylphosphane)platinum(II)

The title compound, cisdichloridobis(triethylphosphane)platinum(II) chloroform monosolvate, [PtCl2(C6H15P) 2]·CHCl3, has been obtained from ligand scrambling in the cis-[PtCl2(Cyp2PCl)(PEt3)] (Cyp = cyclopentyl) system in CHCl3 solvent. Unlike the two previously reported unsolvated polymorphs, which are both monoclinic, the compound crystallizes in an orthorhombic setting. Furthermore, the system exhibits a reversible temperaturedependent structural phase transition, coupling a reduction in anisotropic displacement parameters and a reduction in crystallographic symmetry on cooling. The hightemperature phase adopts space group Pnma with the complex and solvent molecules sitting across a crystallographic mirror plane (Z� = 0.5). The low-temperature phase adopts the space group P212121 with Z� = 1. © 2011 International Union of Crystallography

Severn tidal power Potential effects of altered drainage patterns on freshwater wetlands

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Severn tidal power The natural environment

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Severn tidal power The natural environment

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Stereochemically inactive lone pairs in phosphorus(iii) compounds: The characterisation of some derivatives with the 2,5-(CF3) 2C6H3 (Ar) substituent and their complexation behaviour towards Pt(ii) species

Some new phosphorus(iii) derivatives Ar2PX (X = Br, Cl, F or H), ArPX2 (X = Br or Cl), Ar3P and ArtBuPCl, with the 2,5-bis(trifluoromethyl)phenyl (Ar) substituent on phosphorus, have been prepared, and characterised by 31P and 19F NMR solution-state spectroscopy. The complexing ability of Ar2PX, Ar 3P and ArtBuPCl towards the dimeric platinum(ii) complexes [PtY(μ-Y)(PEt3)]2 (Y = Cl or Br, the latter for X = Br only) has also been investigated. Single-crystal X-ray diffraction studies at low temperature have been carried out for Ar3P, Ar2PCl and the hydrolysis or oxidation products Ar2P(H)OH and Ar 2P(O)OH. The structures of Ar3P and Ar2PCl are particularly interesting as in each compound the geometry around P is approximately octahedral. In Ar3P there are three short contacts to fluorine as well as the three bonded C atoms for both of the independent molecules in the unit cell. For Ar2PCl there are two short P-F contacts, and the octahedron is completed by a weak P-P interaction to a neighbouring molecule. In both instances the lone pair on the P(iii) centre appears to be stereochemically inactive, and does not play a significant role in the structure. © 2011 The Royal Society of Chemistry

Nature conservation implications of sitting wave energy converters off the Moray Firth

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Severn tidal power Nature conservation

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