Different coordination modes for disulfoxides towards diorganotin(IV) dichlorides. X-ray crystal structures of 1,2-cis-bis-(phenylsulfinyl)ethene (rac-,cis-cbpse) and adducts [{Ph2SnCl2(meso-bpse)}n] and [{n-Bu2SnCl2(pdtd)}2]

the reactions of meso-1,2-bis(phenylsulfinyl)ethane (meso-bpse) with ph2sncl2, 2-phenyl-1,3-dithiane trans-1-trans-3-dioxide (pdtd) with n-bu2sncl2 and 1,2-cis-bis-(phenylsulfinyl)ethene (rac-,cis-cbpse) with ph2sncl2, in 1:1 molar ratio, yielded [{ph2sncl2(meso-bpse)}n], [{n-bu2sncl2(pdtd)}2] and [{ph2sncl2(rac,cis-cbpse)}x] (x = 2 or n), respectively. all adducts were studied by ir, m？ssbauer and 119sn nmr spectroscopic methods, elemental analysis and single crystal x-ray diffractometry. the x-ray crystal structure of [{ph2sncl2(meso-bpse)}n] revealed the occurrence of infinite chains in which the tin(iv) atoms appear in a distorted octahedral geometry with cl atoms in cis and ph groups in trans positions. the x-ray crystal structure of [{n-bu2sncl2(pdtd)}2] revealed discrete centrosymmetric dimeric species in which the tin(iv) atoms possess a distorted octahedral geometry with bridging disulfoxides in cis and n-butyl moieties in trans positions. the spectroscopic data indicated that the adduct containing the rac,cis-cbpse ligand can be dimeric or polymeric. the x-ray structural analysis of the free rac-,cis-cbpse sulfoxide revealed that the crystals belong to the c2/c space group.