Synthesis and structure of organyltriphenylphosphonium dicyanoaurates: [Ph3PR][Au(CN)2], R = (CH2)5Me, cyclo-C6H11, CH2CH=CH2, (CH2)3Br, CH2C(O)OMe and [Ph3P(CH2)3PPh3][Au(CN)2]2

Complexes [Ph3PR]+[Au(CN)2]-, R = (CH2)5Me (1), cyclo -C6H11 (2), CH2CH=CH2 (3), (CH2)3Br (4), CH2C(O)OMe (5) and [Ph3P(CH2)3PPh3][Au(CN)2]2 (6) have been synthesized by interacting potassium dicyanoaurate with tetraphenylphosphonium chloride in aqueous solution at room temperature. Yields of compounds 1-6 vary in the range of 72-96 %. The structures of the synthesized compounds have been investigated by IR spectroscopy method. In the IR spectra of complexes 1-6 the characteristic bands of C≡N-group are observed at 2141, 2141, 2141, 2137, 2135, 2141 cm-1 and of С-Р bonds at 1437, 1439,1439,1437,1439, 1435 сm-1, respectively. The strong band typical for carbonyl group (С=О) is observed at 1732 см-1 in spectra of dicyanoaurate 5, and the medium intensity band of С=С-bond is present at 1614 cm-1 in spectra of compound 3. According to X-Ray data, obtained on a Bruker D8 QUEST diffractometer (Mo-Kα radiation, λ = 0.71073 Å, graphite monochromator) at 293 К, compound 1 is crystallized in a rhombohedral crystal lattice and belongs to the P bca space group. The parameters of the crystal cell are: a = 14.277(8) Å, b = 17.760(9) Å, c = 19.860(11) Å, a = β = g = 90.00 degree. Packing density is 1.573 g/cm3. Phosphorus atoms in cations of hexyltriphenylphosphonium complex 1 have distorted tetrahedral coordination: the CPC angles are 103.9(3)°-122.8(3)°, the P-С bonds vary in the range of 1.459(5)-2.075(8) Å. In the practically linear anions [Au(CN)2]- the СAuC angles are 178.9(3)°, the Au-C distances are 2.222(10), 2.230(10) Å. Structural organization in crystal of complex 1 is determined by intermolecular hydrogen bonds N×××Н-С.