Tomohiko Hamaguchi

Bis(2,2′-bipyridine)(pyridin-2-olato)ruthenium(II) hexa­fluorido­phosphate benzene hemisolvate

In the title compound, [Ru(C5H4NO)(C10H8N2)2]PF6·0.5C6H6, the Ru2+ cation has a distorted octahedral RuN5O coordination environment. This complex is more distorted than the closely related ruthenium complex containing a pyridine-2-thiolate ligand [Santra et al. (1997 ▶). J. Chem. Soc. Dalton Trans. pp. 1387–1393]. The distortion is caused by the difference in size between the O and S atoms. The benzene solvent molecule is situated on a twofold rotation axis.

Crystal structure of bis­(1,10-phenanthroline-κ2N,N′)(1,3-thia­zole-2-thiol­ato-κ2S2,N)nickel(II) hexa­fluorido­phosphate 1,4-dioxane sesquisolvate

2-Mercaptothiazolate is generally used as a monodentate and bridging ligand. We report here the crystal structure of a new type of nickel(II) complex in which the 2-mercaptothiazolate ligand acts as a chelating and non-bridging ligand.

Bis[(5-bromo­pyridin-2-yl)methano­lato-κ2N,O]copper(II) monohydrate

In the title compound, [Cu(C6H5BrNO)2]·H2O, the CuII ion has a square-planer N2O2 coordination environment. Slipped π–π stackings [centroid-centroid distances: 3.625 (3), 3.767 (3), 3.935 (3) and 4.255 (3) Å] between pyridine rings and Cu⋯π interactions (centroid-to-CuII distance: 3.56 Å) between Cu2+ ions and pyridine rings lead to a layered arrangement parallel to (010). Intermolecular Br⋯O interactions [Br⋯O distances: 2.904 (3) and 3.042 (3) Å] and O—H⋯O hydrogen bonds form a three-dimensional network structure.

Tris(pyridin-2-yl-methanol)nickel(II) hexa-fluoridophosphate trifluoro-acetate.

In the crystal structure of the title complex, [Ni(C6H7NO)3](PF6)(C2F3O2), the NiII ion is in a slightly distorted octahedral NiO3N3 coordination geometry with each of the three N and three O atoms in a meridional coordination. In the crystal, the complex molecules and the trifluoroacetate anions are connected via O—H⋯O hydrogen bonding into layers parallel to the ab plane.

Triruthenium Cluster Oligomers that Show Multistep/Multielectron Redox Behavior

We synthesized triruthenium cluster oligomers which showed well-separated multistep one-electron redox waves. It has been accomplished by assembling cluster units with different redox potentials. To the best of our knowledge, the present compounds show the largest number of well-characterized and well-separated single-electron redox processes reported thus far. As an extension of this sudy, we are now making dendrimers comprised of the present Ru3 clusters.