Sulfur cluster anion

In a series of papers, metal sulfide cluster anions of first-row transition metals, principally copper, have been reacted with a variety of reagents including thiols, sulfur, phosphorus, and phosphines (99, 145, 256, 257). 

Another cluster anion with type Ilia ligands which contains only molybdenum and sulfur occurs in (NH4)2[Moj8(82)6] H20 (11) (111, 129) (n = 0-2, with variable nonstoichiometric amounts of water, which are disordered in the crystal lattice) (35). This type of ligand has... 

Mononuclear anions, halogenocuprate 1) and halogenoargentate(I) ions four-coordinated metal centers, 37 19 three-coordinated metal centers, 37 7-11 Mononuclear iron-sulfur clusters, 47 219 EPR spectra, 47 423-425 EPR spectra, 47 448... 

A recent review on abiological iron-sulfur clusters should be the primary entry reference to anyone wishing to gain information on this wide field [2]. Indeed, Ogino et al. provide a comprehensive source of data, of synthetic, structural, spectroscopic, and electrochemical nature, on many synthetic iron-sulfur clusters. The electrochemical properties of Roussin s black anion [3] have been investigated... 

It is now well established that thiophenol reacts with zinc salts to give zinc-sulfur clusters, and a further example, [Me4N]2[(jU-SPh)6(ZnSPh)2(ZnCl)2], has been characterized crystal-lographically. The admantane-like structure observed in [(fi-SPh)6(ZnSPh)4]2 is seen to persist in the anion (113).817... 

Activation of an M-CO bond for nucleophilic substitution in anion radical metallo-complexes appears to be quite a general effect (Kaim 1987 Mao et al. 1989,1992 Shut et al. 1995 Klein et al. 1996). Such activation seems to be the basis of metal-cluster catalytic activity. The iron-sulfur cluster (Bu4N)2Fe4S4(SPh)4 deserves to be mentioned here. The cluster is considered as a ferredoxin model (Inoue Nagata 1986) it catalyzes an electron transfer from //-butyl lithium or phenyl lithium to 5-phenyl thiobenzoate or phenylbenzoate (Inoue Nagata 1986). 

An enormous range of metal-sulfur cluster compounds derived from covalently linked cubane clusters and/or ohgomers of metaUothio anions has been prepared. Many... 

A wide range of metal ions is present in metalloenzymes as cofactors. Copper zinc snperoxide dismntase is a metalloenzyme that nses copper and zinc to help catalyze the conversion of snperoxide anion to molecnlar oxygen and hydrogen peroxide. Thermolysin is a protease that nses a tightly bonnd zinc ion to activate a water atom, which then attacks a peptide bond. Aconitase is one of the enzymes of the citric acid cycle it contains several iron atoms bonnd in the form of iron-sulfur clusters, which participate directly in the isomerization of citrate to isocitrate. Other metal ions fonnd as cofactors in metalloenzymes include molybdenum (in nitrate rednctase), seleninm (in glutathione peroxidase), nickel (in urease), and vanadinm (in fungal chloroperoxidase). see also Catalysis and Catalysts Coenzymes Denaturation Enzymes Krebs Cycle. 

C-H bonds, 129 S-C bonds, 442 S-H bonds, 428 S-halogen bonds, 446, 447, 448 S-O bonds, 364 Sulfur clusters/complexes, 917 anions, 1331-1341 cations, 1325-1331 neutrals, 1323-1324... 

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