Synthesis and molecular structure of the mixed polymeric cobalt compound [Co3(SCH2CH2S)3(PEt3)3]2[Co2Cl4(µ-O2SEt2)2]
摘要:
The mixed polymeric cobalt compound [Co-3(SCH2CH2S)(3)(PEt(3))(3)](2)[Co2Cl4(mu-O(2)SEt(2))(2)] 1 containing two trimers and one dimer was isolated from the reaction of [CoCl(PEt(3))(3)] with disodium ethane-1,2-dithiolate in 1,2-dichloroethane. It is monoclinic and crystallizes in space group P2(1)/n, with a = 12.481(7), b = 15.70(2), c = 25.84(2) Angstrom, beta = 97.85(5)degrees and Z = 2 from 2436 reflections with I > 3.50 sigma(l), final R = 0.062. X-Ray diffraction established that the two cobalt atoms in the dimer are linked via the oxygen atoms of the diethyl sulfone forming the eight-membered Co2O4S2 ring with a crystallographic inversion centre through the whole dimer. The observed cleavage of the dithiolate C-S bond together with the formation of the bridging diethyl sulfone are discussed. in the trimer of 1, the Co-3 isosceles triangle is capped by two bidentate SCH2CH2S2- ligands on either side of the plane with the sulfur atoms bridging the two long Co-Co bonds, while the short Co-Co bond is bridged by the third SCH2CH2S2- ligand. Considering the framework of the Co3P3(SCH2CH2S)(3) unit only, there is a pseudo mirror-image plane passing through the Co3P3 plane which bisects the C(31)-C(32) bond. The H-1 NMR spectrum of compound 1 demonstrates the retention of the solid-state structure of the trinuclear species in chloroform solution.