Triorganophosphinegold(I) complexes of pyridine-2-thionate and pyrimidine-2-thionate

Abstract

Triorganophosphinegold(I) complexes of the anions derived from pyridine-2-thione (2-pySH) and 1H-pyrimidine-2-thione (2-pymSH), [Au(PR₃)(SR′)](R = Et, Ph or C₆H₁₁), have been prepared and characterized by spectroscopic (IR, ¹H and ¹³C NMR and fast atom bombardment MS) methods and for the PPh₃ compounds by X-ray crystallographic techniques. The mononuclear compounds feature linear gold atom geometries defined by P and S atoms with important parameters for [Au(PPh₃)(2-pyS)]: Au–P 2.258(1), Au–S 2.297(2)Å and P–Au–S 177.9(1)° and for [Au(PPh₃)(2-pymS)]: Au–P 2.253(2), Au–S 2.310(3)Å and P–Au–S 174.7(1)°. The [Au(PPh₃)(2-pyS)] complex 2 crystallizes in the monoclinic space group P2₁/c with unit-cell dimensions a= 12.235(1), b= 10.009(2), c= 17.292(2)Å, β= 104.08(1)° and Z= 4; [Au(PPh₃)(2-pymS)]5 crystallizes in the triclinic space group P with a= 11.006(2), b= 11.356(4), c= 8.873(1)Å, α= 109.85(2), β= 95.72(1), γ= 93.55(2)° and Z= 2. The structures were refined to final R= 0.025 for 2527 reflections with l 2.5σ(l) and R= 0.057 for 3416 reflections with l 2.5σ(l) for 2 and 5, respectively.