The future of energy supply depends on innovative breakthroughs regarding the design of cheap, sustainable, and efficient systems for the conversion and storage of renewable energy sources, such as solar energy. The production of hydrogen, a fuel with remarkable properties, through sunlight-driven water splitting appears to be a promising and appealing solution. While the active sites of enzymes involved in the overall water-splitting process in natural systems, namely hydrogenases and photosystem II, use iron, nickel, and manganese ions, cobalt has emerged in the past five years as the most versatile non-noble metal for the development of synthetic H(2)- and O(2)-evolving catalysts. Such catalysts can be further coupled with photosensitizers to generate photocatalytic systems for light-induced hydrogen evolution from water.

Splitting water with cobalt.

Recent Developments in Hydrogen Evolving Molecular Cobalt(II)-Polypyridyl Catalysts.

Publisher Summary This chapter discusses the effect of structural properties of cobalt (III) hexa-amines on their other properties. The chapter discusses complexes ranging from cobalt hexa-ammine, to complexes composed of three secondary and three tertiary amine donors. The chapter discusses only those coordination compounds, having a complete CoN 6 core, thus excluding the enormous number of CoN 6 - x L x complexes. Ammonia and organic amines with an aliphatic skeleton are described in the chapter. The chapter discusses complexes, containing just one kind of ligand—that is, homoleptic complexes. Structural properties and their relationship to kinetic stability (toward hydrolysis and racemization), electronic structure, reduction potentials, and electron transfer processes are explained in this chapter. The standard preparative procedure for the Co(III)–amine complexes consist of the reaction of an aqueous or alcoholic solution of a Co(II) salt with the free base of the amine. Oxidation in the solution is achieved by air, oxygen, H 2 0 2 , or other oxidants. In this chapter, the term molecular mechanics describes a method used frequently to predict structures and relative energies of related complexes (usually isomers). The method involves summing the potential energy of all the interatomic interactions in terms of bond deformation, valence angle deformation, torsion angle deformation, and nonbonded interactions. The chapter discusses the effects of structure on the other properties of the amine complexes predominantly in terms of the steric effects.

Structure, Reactivity, Spectra, and Redox Properties of Cobalt(III) Hexaamines

Synthesis of α-amino acids with β,γ-unsaturated side chains

Coordination Chemistry of Azacryptands

Synthese de (dinitro-1,12 hexaazapentacyclodotriacontane) Co(III) 3+ . La reduction par Zn et HCl donne les complexes de Co(II) et reduit les groupes nitro en groupes amino

Synthesis, chiroptical properties, and electron self-exchange reactivity of a rigid pentacyclic metal ion cage system with D3 symmetry

Cobalt(III)-promoted syntheses of the amino acids (RS)-2-cyclopropylglycine and (R)- and (S)-proline

Energy transfer vs. electron transfer in the excited-state quenching of tris(2,2'-bipyridine-N,N')ruthenium(II) complexes by cobalt(III) cage complexes: applications to the photoreduction of water

stereospecific template synthesis of a macrotetracyclic hexaazacryptate: x-ray crystal structure of (9,17-dimethyl-13-nitro-1,3,5,7,11,15-hexaazatetracyclo[11.5.1.13,9.15,1]heneicosane)cobalt(III) chloride

Synthesis and properties of novel cobalt(III) and nickel(II) complexes with coordinated azetidine nitrogens: crystal structure of mer-tris(3-(aminomethyl)-3-methylazetidine)cobalt(III) chloride

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