Reduction of by thioglycolic acid in an aqueous medium: Synthesis and structure of [{Cp*Mo(μ-SCH2COO)}2(μ-S)]

Abstract

Compound ½Cp à 2 Mo 2 O 5 reacts with thioglycolic acid, HSCH 2 COOH, in an acidic (CF 3 COOH) mixed water-methanol solvent, to yield compound [{Cp*Mo(l-SCH 2 CO 2 )} 2 (l-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) Å indicates metal-metal bonding, in agreement with the compound diamagnetism.

(p-Cymene)thioglycollatoruthenium(II) dimer; a complex with an ambi-basic S,O-donor ligand

“…The chelating/S-bridging mode found for the thioglycollate in 1 has direct precedent in some Mo and Co complexes [17] and is also related to other Mo complexes in which the bridging S supports a direct Mo-Mo bond [9,18]. Other examples have the thioglycollate as a simple chelating ligand [19], or simultaneously chelating and bridging metals through both the S and O atoms [20], so it is clearly a versatile ligand.…”

“…The only previous reports of structurally characterised organometallic complexes containing the thioglycollate ligand appear to be a mixed Mo-Zr species with one chelating and one bridging ligand [8], and [Cp*Mo(SCH 2-COO)] 2 S with chelating/bridging ligands [9]. We now report the structure of [(p-cymene)Ru(SCH 2 COO)] 2 , 1, for comparison with that of the previously described thiosalicylate analogue 2 [2].…”

Interaction of CdTe Quantum Dots with 2,2-Diphenyl-1-Picrylhydrazyl Free Radical: A Spectroscopic, Fluorimetric and Kinetic Study

“…Thus the smaller QDs react with DPPH • faster than the larger ones. Since thioglycolic acid (used as capping agent) is also a known reducing agent [41], experiments were performed where the capping agent (TGA) alone was added to DPPH • , and spectral changes similar to those in Fig. 5 were observed.…”

High oxidation state organomolybdenum and organotungsten chemistry in protic environments

“…A comparison of the results obtained for the reduction of Compound [Cp * 2 Mo 2 O 5 ] has also been reduced by compounds containing a S-H bond, namely HS(CH 2 ) n COOH (n = 1, 2) in an aqueous environment (MeOH-H 2 O acidified with CF 3 COOH) [144,145]. These reactions leads to very similar dinuclear products of Mo IV with formula [(Cp * Mo) 2 (-S(CH 2 ) n CO 2 ) 2 (-E)], curiously differing by the nature of E (S for n = 1 [144] and O for n = 2 [145]), see Scheme 10.…”

“…These reactions leads to very similar dinuclear products of Mo IV with formula [(Cp * Mo) 2 (-S(CH 2 ) n CO 2 ) 2 (-E)], curiously differing by the nature of E (S for n = 1 [144] and O for n = 2 [145]), see Scheme 10. The electrons for the reductions are provided by the S-H bonds, yielding compounds HOOC(CH 2 ) n SS(CH 2 ) n COOH which cocrystallize in each case with the organometallic product as H-bonded interstitial molecules.…”