Synthesis and X-ray crystal structure of an anionic heteronuclear metallamacrocyclic triangle

trans-[Pt{C=C(Ar)C-CH}(2)(PMe3)(2)] (Ar = C6Me4-3,4,5,6) (1) reacts with PPN[Au(acac)(2)] (Hacac = acetylacetone; 1:1.16 molar ratio; PPN = (Ph3P)(2)N) to give PPN[{Au-{Pt(PMe3)(2)}(2)}{mu-Ar(C=C)(2)}(3)] (2) the crystal structure of which showed the anions as quasi equilateral triangles stacked parallel to each other through C-H...Au interactions, resulting in channels of rhombic cross-section.