We report the synthesis and characterization of RuC7, a complex in which a heme is covalently attached to a [Ru(bpy)(3)](2+) complex through a -(CH(2))(7)- linker. Insertion of RuC7 into horse heart apomyoglobin gives RuC7Mb, a Ru(heme)-protein conjugate in which [Ru(bpy)(3)](2+) emission is highly quenched. The rate of photoinduced electron transfer (ET) from the resting (Ru(2+)/Fe(3+)) to the...

Studies were carried out to elucidate the nature and importance of Fe reduction in anaerobic slurries of marine surface sediment. A constant accumulation of Fe took place immediately after the endogenous NO(3) was depleted. Pasteurized controls showed no activity of Fe reduction. Additions of 0.2 mM NO(3) and NO(2) to the active slurries arrested the Fe reduction, and the process was resumed on...

Dinuclear iron carbonyl complex 2, which contains an elongated unsupported Fe-Fe bond, was synthesized by the reaction between Fe2(CO)9 and phosphinyl radical 1. Thermal Fe-Fe bond homolysis led to the generation of a four-coordinate carbonyl-based iron-centered radical, 3, which is stabilized by π-donation. Complex 3 exhibited high reactivity toward organic radicals to form diamagnetic five-co...

The anion [Fe(2)(S(2)C(3)H(6))(CN)(CO)(4)(PMe(3))](-) (2(-)) is protonated by sulfuric or toluenesulfonic acid to give HFe(2)(S(2)C(3)H(6))(CN)(CO)(4)(PMe(3)) (2H), the structure of which has the hydride bridging the Fe atoms with the PMe(3) and CN(-) trans to the same sulfur atom. (1)H, (13)C, and (31)P NMR spectroscopy revealed that HFe(2)(S(2)C(3)H(6))(CN)(CO)(4)(PMe(3)) is stereochemically ...

   The interaction of Fe2O3, Fe3O4 and SiO2 nanoparticles with proteinase K activity was investigated using UV–vis spectroscopy. Proteinase K EC (3.4.21.14) is a member of serine protease family, which is produced from fungus Tritirachum album Limber.The effects of nanoparticles on proteinase...

As an extension of prior studies involving the linear quaterpyridine ligand, 5,5'''-dimethyl-2,2':5',5'':2'',2'''-quaterpyridine 1, the synthesis of the related expanded quaterpyridine derivatives 2 and 3 incorporating dimethoxy-substituted 1,4-phenylene and tetramethoxy-substituted 4,4'-biphenylene bridges between pairs of 2,2'-bipyridyl groups has been carried out via double-Suzuki coupling r...

The three-coordinate iron(II) NHC complexes [(IPr)Fe(N'')2] (1) and [(I(t)Bu)Fe(N'')2] (3) (N'' = N(SiMe3)2) react with PhSeH or LiSePh to give the iron(II) selenolates [(IPr)Fe(N'')(SePh)] (6) and [I(t)Bu(H)][(aI(t)Bu)Fe(SePh)3], [I(t)Bu(H)][7], with complex 7 containing an abnormal NHC ligand.

Investigations on a series of eight novel mononuclear iron(III) Schiff base complexes with the general formula [Fe(L(5))(L(1))]·S (where H(2)L(5) = pentadentate Schiff-base ligand, L(1) = a pseudohalido ligand, and S is a solvent molecule) are reported. Several different aromatic 2-hydroxyaldehyde derivatives were used in combination with a non-symmetrical triamine 1,6-diamino-4-azahexane to sy...

A new route to iron carbonyls has enabled synthesis of (57)Fe-labeled [NiFe] hydrogenase mimic (OC)3(57)Fe(pdt)Ni(dppe). Its study by nuclear resonance vibrational spectroscopy revealed Ni-(57)Fe vibrations, as confirmed by calculations. The modes are absent for [(OC)3(57)Fe(pdt)Ni(dppe)](+), which lacks Ni-(57)Fe bonding, underscoring the utility of the analyses in identifying metal-metal inte...

A new iron complex with a thioamide SNS pincer type ligand, [FeBr2(κ(3)-H2L(DPM))] (κ(3)-H2L(DPM) = 2,6-bis(N-2,6-bis(diphenylmethyl)-4-isopropylphenylthioamide)pyridine), was synthesized. This complex reacts with NaH in THF to yield a unique Fe(ii) complex with two THF molecules, [Fe(THF)2(κ(3)-L(DPM))] (κ(3)-L(DPM) = 2,6-bis(N-2,6-bis(diphenylmethyl)-4-isopropylphenyliminothiolate)pyridine). ...