The reaction of [Fe(N(SiM e3)2)2] with thiols RSH, elem ental sulfur, and neutral ligands L (with sulfur donor atoms, e.g. thiourea derivatives) gives [Fe4S4(SR )2L2] clusters in high yields. The structure of [Fe4S4(2.4.6-(C3H7)3C6H 2-S)2(dpdm i)2] (dpdmi: diisopropyldim ethylim idazolthion) was determ ined by X-ray crystallography. W hen [Fe4S4I4]2~ is reac ted w ith a large excess o f P M eP ...

Quantitative analysis by high-pressure liquid chromatography shows that all commercial samples of elemental sulfur besides S8 contain traces of S7 (up to 0.56%) and in some cases also S6, S9, and polymeric sulfur (S«,). Pure S8 can be obtained by recrystallization from CS2. Elemental sulfur minerals also quite often contain traces of S7 (up to 0.3%). Since neither irradiation by daylight at 20 ...

This art ic le descr ibes the use of sul fur-containing organic monolayers to improve the adhesion of gold to sil icon substrates having a native sil icon dioxide surface layer. Gold adheres to clean sil icon,r but not to sil icon dioxide.2 The affinity of gold toward sil icon dioxide can be improved by coating with chromium3 or titaniumt films or by adding interlayers containing fluoride salts...

The effects of three sulfur products (calcium polysulfide [= lime sulfur], dry flowable sulfur, and ammonium thiosulfate, a plant nutrient), were tested in bioassays against a predatory mite, Galandromus occidentalis (Nesbitt), and two species of tetranychid (pest) mites, twospotted spider mite (Tetranychus urticae Koch) and European red mite [Panonychus ulmi (Koch)]. Calcium polysulfide and am...

Polysulfides formed through the breakdown of elemental sulfur or other sulfur compounds were found to be reduced to H(2)S by the hyperthermophilic archaebacterium Pyrococcus furiosus during growth. Metabolism of polysulfides by the organism was dissimilatory, as no incorporation of S-labeled elemental sulfur was detected. However, [S]cysteine and [S]methionine were incorporated into cellular pr...