George B. Richter-Addo

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Inorganic nitrate and nitrite from endogenous or dietary sources are metabolized in vivo to nitric oxide (NO) and other bioactive nitrogen oxides. The nitrate-nitrite-NO pathway is emerging as an important mediator of blood flow regulation, cell signaling, energetics and tissue responses to hypoxia. The latest advances in our understanding of the(More)
Clostridium difficile is a spore-forming obligate anaerobe that can remain viable for extended periods, even in the presence of antibiotics, which contributes to the persistence of this bacterium as a human pathogen during host-to-host transmission and in hospital environments. We examined the structure and function of a gene product with the locus tag(More)
The title compound, [Fe(C64H64N8O4)Cl], is a five-coordinate square-pyramidal porphyrin complex with a chloride ion in the axial position, being coordinated from the protected side of the porphyrin; the Fe(III) atom is displaced by 0.474 (5) Å from the 24-atom mean plane of the porphyrin core towards the chloride. The porphyrin moiety is a 'picket-fence'(More)
The title compound, C20H10F12N4O4S2, is an organic diaryl di-sulfide compound with tri-fluoro-acetamide substituents at the ortho-positions of each benzene ring. There are two mol-ecules (labeled A and B) in the asymmetric unit. The F atoms of three of the -CF3 groups exhibit rotational disorder over two positions each. The S-S bond distances are 2.0914 (7)(More)
The title compound, [Fe(C44H28N4)(C4H6N2)2]·2C4H6N2, is a six-coordinate Fe(II)-porphyrinate complex with the metal located on a center of inversion and coordinated by two axial 1-methyl-imidazole ligands; the complex crystallizes as a 1-methyl-imidazole disolvate. The 1-methyl-imidazole group bonded to the Fe(II) atom [occupancy ratio 0.789 (4):0.211 (4)](More)
The solvated title compound, [Fe(C44H28N4)(C4H6N2)(C7H7NO)]·CH2Cl2, is a porphyrin complex containing an octahedrally coordinated Fe(II) atom with 1-methylimidazole [Fe-N = 2.0651 (17) Å] and o-nitro-sotoluene ligands at the axial positions. The o-nitro-sotoluene ligand is N-bound to iron(II) [Fe-N = 1.8406 (18)Å and Fe-N-O = 122.54 (14)°]. The axial N-Fe-N(More)
The title compound, [Fe(C6HF4O)(C48H36N4O4)]·C6H12, represents a five-coordinate iron(III) porphyrin complex in a square-pyramidal geometry with a tetra-fluoro-phenolate anion as the axial ligand. The Fe(III) atom is displaced by 0.364 (2) Å from the 24-atom mean plane of the porphyrinate ring towards the tetra-fluoro phenolate anion. The average Fe-N(More)
The title compound, [Fe(NO)(2)(C(18)H(12)F(3)P)(2)]·CHCl(3), belongs to the family of metal dinitrosyl compounds with the general formula Fe(NO)(2)(L)(x), referred to collectively as 'dinitrosyl iron compounds' (DNICs). Herein we report the structure of a dinitrosyl iron diphosphane complex, (Fe(NO)(2)L(2), with L = P(C(6)H(4)-p-F)(3). The structure(More)
The title compound, [Fe(CF(3)O(3)S)(C(48)H(36)N(4)O(4))], is a five-coordinate iron(III) porphyrin complex with a trifluoro-methane-sulfonate anion as an axial ligand. The Fe(III) atom is displaced by 0.40 (1) Å towards the trifluoro-methane-sulfonate anion from the 24-atom mean plane of the porphyrin. The average Fe-N(p) distance is 2.044 (2) Å and the(More)
The title compound, [OsCl(NO)(C(48)H(36)N(4))]·4C(4)H(8)O, is a six-coordinate osmium(II) porphyrin complex with nitrosyl (NO) and chloride (Cl) ligands trans to each other in an octa-hedral geometry. The metal complex lies on a fourfold rotation axis that passes through the Os, N, O and Cl atoms. The NO and Cl ligands are disordered in an 0.511 (12):0.486(More)