Add time:07/28/2019         Source:sciencedirect.com

Single crystals of two modifications of AuBr, called P-AuBr and I-AuBr, were prepared by a vapour-transport method. I-AuBr is isostructural with AuCl; it is tetragonal with a = 6.940Å, c = 9.252Å, space group I41/amd, Z = 8. P-AuBr is isostructural with Aul; it is tetragonal with a = 4.296Å, c = 12.146Å, space group P42/ncm, Z = 4.The structures consist of zigzag chains of Au and Br with symmetry mm. Au is linearly coordinated to Br at distances of 2.40Å in I-AuBr and 2.44Å in P-AuBr; the bond angles Au-Br-Au are 92.3° and 77.1°, respectively.The bromine atoms and gold atoms in P-AuBr form square planar nets perpendicular to the c axis with the dimensions 4.30Å × 4.30Å and 3.04Å × 3.04Å, respectively, for bromine and gold layers; the Au-Au distance inside the chain is equal to the distance between gold atoms of different chains in the same layer. The sequence of layers of Au and Br is Au/Br/Br/ Au/Br/Br/Au. Therefore P-AuBr can also be considered as a layered compound.

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