METAL-COMPLEXES OF FUNCTIONALIZED SULFUR-CONTAINING LIGANDS .3. REACTIONS OF (PH3P)2PT(ETA-2-C2H4) WITH ACYCLIC-THIOSULFINATES AND CYCLIC-THIOSULFINATES - PLATINUM(II)-THIOLATO COMPLEXES WITH SULFENATO LIGANDS - CRYSTAL-STRUCTURE DETERMINATION OF (4-SULFIDO-1-BUTANESULFENATO-S,S')BIS(TRIPHENYLPHOSPHANE)PLATINUM(II) (PH3P)2PT-S(O)-[CH2]4-S

Oxidative addition of acyclic thiosulfinates R'-S(O)-S-R (1a: R' = R = CH3; 1b: R' = R = Ph; 1c: R' = R = p-CH3C6H4; 1d: R' = p-ClC6H4, R = C6H5) to (Ph3P)2Pt(eta-2-C2H4) (4) leads to the monomeric trans-configurated complexes (Ph3P)2Pt[S(O)R'](SR) (5a-d) which loose one PPh3 ligand in solution and form the dimetallic thiolato-bridged compounds [(Ph3P)Pt[S(O)R'](mu-SR)]2. The cyclic thiosulfinates 1,2-dithiane S-oxide (2) and 1,4-dihydro-2,3-benzodithiine S-oxide (3) react with 4 to yield the monomeric seven-membered chelate (Ph3P)2Pt-S(O)-(CH2)4-S (7) and the dimetallic complex [(Ph3P)Pt-S(O)-CH2-C6H4-CH2-mu-S]2 (8), respectively. In 7, characterized by X-ray diffraction, a tetrahedral distortion of the square planar coordination of the platinum(II) atoms is remarkable; the planes Pt,P(1),P(2) and Pt,S(1),S(2) form an angle of 16.1-degrees.