Synthesis, crystal structure and a spectroscopic study of bis(triphenylphosphine)gold(I)+ TCNQ-

Article abstract of DOI:10.1016/S0277-5387(97)00463-4

The complex of the bis(triphenylphosphine)gold(I) cation and the radical anion of 2,2-(2,5-cyclohexadiene-1,4-diylidene)bispropanedinitrile, (TCNQ), has been prepared and characterized by spectroscopic and X-ray crystallographic methods. The solid state structure consists of the linear (P-Au-P) cation bis(triphenylphosphine)gold(I) and the approximately planar radical anion of TCNQ. The bond lengths are: Au-P 2.300(2); P-C 1.800(11), 1.789(11), 1.800(11); C≡N 1.175(16), 1.128(16). The infrared spectrum of the complex exhibits bands at 2176 and 2150 cm^-1 in the nitrile region. The electron spin resonance spectrum of this compound, in benzene, is consistent with a structure in which the TCNQ radical anion is symmetrically oriented about the bis(triphenylphosphine)gold(I) cation. The hyperfine coupling constants are: a^N = 0.981, a^H = 1.379, a^P = 0.095 gauss.