How to make water splitting catalysts better?
- New insights for molecular artificial photosynthesis catalysts by metsl-oxide and/or metal-sulfides clusters,
Y. Hayashi, Sulphuric acid and industry, 75, No. 9, 115-130 (2022). Polyoxovanadate review 2
- Coordination Chemistry of Polyoxovanadates as Inorganic Ligands,
Y. Hayashi, Bull. Jpn. Soc. Coord. Chem., 66, 12-25, (2015). DOI:10.4019/bjscc.66.12 Polyoxovanadate Review
- Hetero and Lacunary Polyoxovanadate Chemistry: Synthesis, Reactivity and Structural Aspects, Y. Hayashi, Coord. Chem. Rev., 255, 2270–2280 (2011). DOI:10.1016/j.ccr.2011.02.013
Hexamethoxohexavanadate.
- Synthesis of a Bowl-type Dodecavanadate by the Coupling Reaction of Alkoxohexavanadate and Discovery of a Chiral Octadecavanadate, K. Domae, D. Uchimura, Y. Koyama, S. Inami, Y. Hayashi, K. Isobe, H. Kameda, T. Shimoda, Pure. Appl. Chem., 81, 1323–1330 (2009). DOI:10.1351/PAC-CON-08-08-25
The era of artificial photosynthesis, likely to arrive in the near future, promises more efficacy. The idea is not new, but a significant improvement has to be made due to the fact that all targeted materials are readily available from fossil fuel. The choice of a suitable catalyst is a key to a successful uphill reaction. Because oxides and sulfides change its structure, an intricate design of materials that make the catalyst more lasting and trouble free is necessary. The molecular chemistry of a pure material with a consistent knowledge of not only a composition but also a nano-structure is requested. In this manuscript, the basic principles of inorganic chemistry behind oxides and sulfides are explained and the recent development of vanadium oxide clusters as a model oxide-cluster molecule including a vanadium-oxide layer copmlex, a hetero vanadium-oxide cluster, a vanadium-oxide host molecule, a cubane-type manganese vanadium-oxide cluster mimicking the structure of the photosynthesis active center, and a planer-type cobalt- and a nickel-hydroxide cluster that is the proposed active center for artificial photosynthesis, are reported in Japanese language.
The review on isopolyoxovanadate species including reduced species is presented in Japanese language.
The review on iso- and heteropolyoxovanadates including lacunary polyoxovanadates.
A V(V) hexamer, the Lindqvist-type hexametalates is a representative polyoxometalate framework. It has labile methoxo-groups on the core. Those methoxo groups are moving rapidly on the surface, however in the solid state, it prefers a pseudo-hexagonal arrangement on the hexametalate core. It produces by disolving the precursor in methanol.