A monoclinic polymorph of [(Z)-N-(3-chloro­phen­yl)-O-methyl­thio­carbamato-κS](tri­phenyl­phosphane-κP)gold(I): crystal structure and Hirshfeld surface analysis

The title compound, [Au(C8H7ClNOS)(C18H15P)], is a monoclinic (P21/n, Z′ = 1; form β) polymorph of the previously reported triclinic form (P-1, Z′ = 1; form α) [Tadbuppa & Tiekink (2010[Tadbuppa, P. P. & Tiekink, E. R. T. (2010). Acta Cryst. E66, m664.]). Acta Cryst. E66, m664]. The mol­ecular structures of both forms feature an almost linear gold(I) coordination geometry [P—Au—S = 175.62 (5)° in the title polymorph], being coordinated by thiol­ate S and phosphane P atoms, a Z conformation about the C=N bond and an intra­molecular Au⋯O contact. The major conformational difference relates to the relative orientations of the residues about the Au—S bond: the P—Au—S—C torsion angles are −8.4 (7) and 106.2 (7)° in forms α and β, respectively. The mol­ecular packing of form β features centrosymmetric aggregates sustained by aryl-C—H⋯O inter­actions, which are connected into a three-dimensional network by aryl-C—H⋯π contacts. The Hirshfeld analysis of forms α and β shows many similarities with the notable exception of the influence of C—H⋯O inter­actions in form β.