Synthesis of bis(imidazole) metal complexes and their use in rapid NO detection and quantification devices.

To explore the release of nitrogen oxide gases from reaction solutions, we developed a series of colorimetric sensors based on the cis-nitrogen-donating ligand bis(1-methylimidazol-2-yl)phenylmethoxymethane (BIPhMe). The complexes M(BIPhMe)X2, where M is Fe(2+) or Co(2+) and X is Cl(-), Br(-), or I(-), were prepared and structurally and spectroscopically characterized. The reactivity of these complexes toward NO(g) and NO2(g) in solution was explored.

A tetranitrosyl [4Fe-4S] cluster forms en route to Roussin's black anion: nitric oxide reactivity of [Fe4S4(LS3)L'](2-).

Previous studies provide evidence that [4Fe-4S] clusters serve as targets of reactive nitrogen oxide species in biology. The products of this reaction range from dinitrosyliron complexes, [Fe(NO)2L2](-), to Roussin's black anion, [Fe4S3(NO)7](-). To date, the pathways by which these reactions occur have not been fully elucidated.

Oxidation chemistry of axially protected Mo(2) and W(2) quadruply bonded compounds.

Reported is a facile, high-yielding one-pot synthesis of the quadruply bonded ditungsten (II,II) compound W(2)(dpa)(4) (1) (dpa = 2,2'-dipyridylamide), which was obtained from W(CO)(6) at high temperature in naphthalene. A similar reaction in 1,2-dichlorobenzene furnished a ditungsten (III, III) species as the major product that was crystallized as [W(2)(dpa)(3)Cl(2)][BPh(4)] (3). The [W(2)(dpa)(3)Cl(2)](+) cation is better prepared by oxidation of 1 with SO(2)Cl(2).