η2-S,S′-1,5-dithia-2,4,6,8-tetrazocine analogues of η2-alkene complexes: preparation and electronic structure of Pt[1,5-(Me2N)2C2N4S2](PPh3)2

The reaction of Pt(C2H4)(PPh3)2 with 1,5-E2N4S2(E = Ph2P, Me2NC) in acetonitrile produces high yields of Pt(1,5-E2N4S2)(PPh3)2 in which the η2-S,S′ bonding between platinum and the heterocyclic ligand is shown by density functional calculations to be analogous to that found in η2-alkene-platinum complexes.