Structure of the five-coordinate Co complex (1-imidazole){tris-[(1-benzyl-triazol-4-yl-κ)meth-yl]amine-κ}cobalt(II) bis-(tetra-fluoro-borate).

The title compound, [Co(CHN)(CHN)](BF), is a five-coordinate Co complex based on the neutral ligands tris-[(1-benzyl-triazol-4-yl)meth-yl]amine (tbta) and imidazole. It exhibits a distorted trigonal bipyramidal geometry in which the equatorial positions are occupied by the three N-atom donors from the triazole rings of the tripodal tbta ligand. The apical amine N-atom donor of tbta and the N-atom donor of the imidazole ligand occupy the axial positions of the coordination sphere.

The Biologically Relevant Coordination Chemistry of Iron and Nitric Oxide: Electronic Structure and Reactivity.

Nitric oxide (NO) is an important signaling molecule that is involved in a wide range of physiological and pathological events in biology. Metal coordination chemistry, especially with iron, is at the heart of many biological transformations involving NO. A series of heme proteins, nitric oxide synthases (NOS), soluble guanylate cyclase (sGC), and nitrophorins, are responsible for the biosynthesis, sensing, and transport of NO.

Substituent Effects on the Coordination Chemistry of Metal-Binding Pharmacophores.

A combination of XAS, UV-vis, NMR, and EPR was used to examine the binding of a series of α-hydroxythiones to CoCA. All three appear to bind preferentially in their neutral, protonated forms. Two of the three clearly bind in a monodentate fashion, through the thione sulfur alone.