Abstract
The crystalline yellow complexes [Ph3PAlk][Au(CN)2Br2], where Alk = CH2C6H4(OH)-2 (I), CH2C6H11-cyclo (II ⋅ 1/2PhH), CH2Ph (III), CH2C6H4CN-4 (IV), have been synthesized from potassium dicyanodibromoaurate and alkyl triphenyl phosphonium chlorides in water and structurally characterized by X-ray diffraction. Crystals of complexes I–IV contain tetrahedral alkyl triphenyl phosphonium cations (CPC, 104.8(2)°–114.1(2)°; P–C, 1.782(6)–1.825(5) A). In square [Au(CN)2Br2]– anions, the CAuC and BrAuBr trans-angles are 178.8(2)°–180.0(5)° and 178.38(3)°–180.00(3)°, and the Au–C and Au–Br bonds are 2.001(7)–2.205(9) A and 2.4086(14)–2.4276(18) A, respectively. The crystal structures are formed by weak hydrogen bonds N⋅⋅⋅Н–С and strong bonds N⋅⋅⋅Н–О in complex I and contacts Br⋅⋅⋅Н–С in dicyano-dibromides I, III, and IV.
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