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- W2008616626 abstract "The compound bis(methyltriphenylphosphonium) tetrabromozincate(II), [C 19 H 18 P] 2 [ZnBr 4 ], Mr = 939.640, has a monoclinic unit cell, space group P2 1 . The lattice parameters are a = 9.7693(4) Å , b = 12.5508(4) Å , c = 16.5372(6) Å , α = 90.00°, β = 105.2670(11)°, γ = 90.00°, V = 1956.11(11) Å 3 , Z = 2, D x = 1.595 mgm −3 at T = 298 K. The structure consists of one distorted [ZnBr4] 2− tetrahedron and two [(CH 3 )(C 6 H 5 ) 3 P] + cations. Differential scanning calorimetry indicates a continuous second-order transition at (276±2) K that may be classified as a commensurate to incommensurate transformation. A first-order transition to a higher symmetry is associated with a four-fold rotation of the [ZnBr4] 2− ion and a change of entropy ΔS = 22.92 J/(K· mol) at T = (362±3) K. Dilatometric measurements showed a decrease of the lattice parameters in the temperature range 230 - 260 K, confirmed the transition at (276±2) K, and indicated the presence of a third transition at 282 K." @default.
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- W2008616626 date "2007-09-01" @default.
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- W2008616626 title "Preparation, Characterization and Crystal Structure of the Room Temperature Phase of [(CH3)(C6H5)3P]2[ZnBr4]: A Member of the A2BX4 Family" @default.
- W2008616626 doi "https://doi.org/10.1515/zna-2007-0913" @default.
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