The reactivity of [Pt(SbPh 3 ) 3 ], a compound of zerovalent platinum, exceptionally stable in air, is described. The compounds [{Pt(SbPh 3 ) 3 } 2 N 2 ], containing bridging dinitrogen, [{Pt(SbPh 3 ) 3 } 2 C 2 ], with an ethynediyl group also bridging, and [Pt(CO) 2 (SbPh 3 ) 2 ], were all obtained under ordinary pressure of nitrogen, acetylene or carbon monoxide, respectively, and are also described. Among the products of the reactions, the dimer [PtBr 3 (SbPh 3 ) 2 ] 2 and the mixed complexes [PtL 2 (SbPh 3 ) 2 ] (L = PPh 3 , AsPh 3 ) were also obtained. Some of these complexes are luminescent when excited by u.v. radiation.