The complexity of polynuclear transition metal complexes with the most appealing magnetic properties makes it impossible to extract the values of exchange interactions between the paramagnetic centers using experimental techniques. Hence, theoretical methods based on density functional theory are used because they allow the accurate estimation of such values. Three Mn(6) complexes were studied ...

A bacterium isolated from soil (designated 9702-M4) synthesizes an extracellular polymer that facilitates the transport of such hydrophobic pollutants as polynuclear aromatic hydrocarbons, as well as the toxic metals lead and cadmium in soil. Biolog analysis, growth rate determinations, and percent G+C content identify 9702-M4 as a strain of Sinorhizobium meliloti. Sequence analysis of a 16S rD...

Gold(I) Thiolates, (Benzylthiolato)gold(I) Complexes, Gold(I) Mercaptocarboxylates, Polynu­ clear Gold(I) Complexes In a search for air-stable and water-soluble mercapto compounds of gold with a high gold content, benzylthiol, a-mercapto-acetic acid, /3-mercapto-propionic acid, and thiosalicylic acid were converted into aurated sulfonium salts by treatment with reagents of the type [(R^PjAufiO*...

Since the discovery of carcinogenic polynuclear aromatic hydrocarbons in 1930 (@0), numerous at tempts have been made to correlate the carcino genicity of these compounds with their chemical structure. When methylcholanthrene, a highly carcinogenic polynuclear aromatic hydrocarbon, was synthesized in the laboratory from bile acids (7), the possibility arose that cancer may be caused by carcinog...