Browsing by Subject "SULFIDO LIGANDS"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Reduction of [CP*2Mo2O5] by mercaptopropionic acid in an aqueous medium.: Isolation and characterization of a dinuclear oxo- and 3-sulfido-proprionato(2-)-bridged molybdenum(IV) compound
    (ELSEVIER SCIENCE SA) Dinoi, C; Prikhodchenko, P; Demirhan, F; Gun, J; Lev, O; Daran, JC; Poli, R
    Reaction of Cp-2*Mo2O5 with HSCH2CH2COOH in acidic (by CF3COOH) 50:50 MeOH-H2O solvent at room temperature yields compound Cp-2*Mo-2(mu-O)(mu-SCH2CH2CO2)(2), a dinuclear diamagnetic Mo-IV compound with a two-leg-sharing bis(four-legged piano stool) structure and a Mo-Mo distance of 2.6833(6) angstrom. A reaction monitoring by ESI MS shows the formation of an intermediate 18 mass units heavier, interpreted as a dihydroxo analogue. Electrochemistry shows a reversible, pH independent oxidation process and an irreversible, pH-dependent reduction process. Contrary to a recently published analogous reaction with the closely related HSCH2COOH substrate, this process does not lead to C-S bond cleavage. (c) 2007 Elsevier B.V. All rights reserved.
  • No Thumbnail Available
    Item
    Reduction of [CP2*Mo2O5] by thioglycolic acid in an aqueous medium
    (ELSEVIER SCIENCE SA) Demirhan, F; Taban, G; Baya, M; Dinoi, C; Daran, JC; Poli, R
    Compound [CP*2Mo2O5] reacts with thioglycolic acid, HSCH2COOH, in an acidic (CF3COOH) mixed water-methanol solvent, to yield compound [{Cp*Mo(mu-SCH2CO2)}(2)(mu-S)]. During this reaction, the thioglycolic acid acts as a reducing agent, as a ligand, and provides a sulfide ion for the Mo-S-Mo bridge. The molecular structure of the product can be described as containing two four-legged piano stools that share three legs. The Mo-Mo distance of 2.792(7) angstrom indicates metal-metal bonding, in agreement with the compound diamagnetism. (c) 2005 Elsevier B.V. All rights reserved.