Abstract Tetrasulfur tetranitride reacts with (PPh 3) 2M(C 2H 4), M = Pd, Pt, or [(PPh 3) 2Ni(C 3Ph 3)]ClO 4 to give the compounds (PPh 3)M(μ-S 2N 2) 2M(PPh 3). A complete X-ray structure determination has been carried out on the platinum derivative. The compound crystallizes in the monoclinic system, space group P2 1/ n, with a 14.872(10), b 14.920(10), c 9.255(6) Å, β 98.93(4)°, Z = 4. The structure was solved by the heavy atom method and refined by full-matrix least-squares to the conventional R factor of 0.063 for 811 observed reflections. The structure consists of centrosymmetric dinuclear complexes in which the metal atoms are bridged by two S 2N 2 fragments. Each S 2N 2 group acts as a bidentate ligand bridging the metal centers through a nitrogen and coordinating to only one metal through a sulfur atom. A triphenylphosphine ligand completes a square planar environment around each metal atom.