The resonance Raman spectra of neutrophil cytochrome b558 obtained upon Soret excitation indicate that the heme is low spin six-coordinate in both ferric and ferrous oxidation states; comparison with the spectra of bis-imidazole hemin suggests imidazole or imidazolate axial ligation. Minor bands attributable to vibrational motions of ring-conjugated vinyl substituents were also observed, consis...

In the title coordination polymer, {[Zn(C(9)H(7)NO(4))(C(10)H(14)N(4))]·2H(2)O}(n), the Zn(II) ion displays a distorted tetra-hedral geometry with two imidazole N atoms from two 1,1'-(butane-1,4-di-yl)bis-(imidazole) (bbi) ligands and two carboxyl-ate O atoms from two 2,6-dimethyl-pyridine-3,5-dicarboxyl-ate (dpdc) ligands. The bbi and dpdc ligands bridge the Zn(II) ions, forming layers paralle...

The title compound, [Ag(2)(C(16)H(14)N(6))(2)](BF(4))(2), forms a centrosymmetric 22-membered metallamacrocycle via two Ag(I) ions bridging two 2,3-bis-(imidazol-1-ylmeth-yl)quinoxaline ligands. The Ag(I) ions are coordinated by two N donors of the imidazole groups, forming an approximately linear coordination geometry.

The title compound, [Co(2)Cl(4)(C(7)H(8)N(4))(2)], contains a dinuclear complex molecule in which each Co(II) atom is tetra-hedrally coordinated by two N atoms and two chloride ions. The 1,1'-methyl-enebis(1H-imidazole) ligands adopt a bis-monodentate bridging mode linking two Co(II) atoms.

The synthesis of two molecular iron complexes, a dinuclear iron(iii,iii) complex and a nonanuclear iron complex, based on the dinucleating ligand 2,2'-(2-hydroxy-5-methyl-1,3-phenylene)bis(1H-benzo[d]imidazole-4-carboxylic acid) is described. The two iron complexes were found to drive the oxidation of water by the one-electron oxidant [Ru(bpy)3](3+).