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Polynuclear chain complexes of ruthenium(II,III) pivalate dimers linked by 2,5-dimethyl-N,N'-dicyanobenzoquinonediimine, 1,4-benzoquinone, and 1,4-naphthoquinone

Yoshioka D., Hanada M., Mikuriya M., Hiromitsu I.

Materials Science Poland

2005

Vol. 23, No. 3

765--771

Reactions of ruthenium(II,III) pivalate dimer with 2,5-dimethyl-N,N'- dicyanobenzoquinonediimine (2,5-dmdcnqi), 1,4-benzoquinone (1,4-bq), and 1,4- naphthoquinone (1,4-nq) gave polynuclear chain complexes, [Ru2(O2CCMe3)4(L)]nXn, L = 2,5-dmdcnqi, 1,4-bq, and 1,4-nq and X = BF4- and PF6-. It was shown that a weak antiferromagnetic interaction (J = -0.15 cm-1) operates between Ru(II,III) dimers for the 2,5- dmdcnqui complex.

Structural effects on magnetism of pyridyl nitroxide complexes of ruthenium(II, III) pivalate dimers

Handa M., Sayama Y., Mikuriya M., Hiromitsu I., Kasuga K.

Materials Science

2003

Vol. 21, No. 2

199-206

The 1:1 reactions in molar ratio of ruthenium(II,III) pivalate dimer and pyridyl nitronyl nitroxide gave chain complexes, [Ru2(O2CCMe3)4(L)]n(BF4)n, L = 2-(4-pyridyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxyl-3-N-oxide and 2-(3-pyridyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxyl-3-N-oxide. For the complex with the former radical, the chain structure made up by an alternated dimer-radical arrangement due to the axial coordination of pyridyl nitrogen and one of two nitroxide oxygens of the radical was confirmed by the X-ray diffraction method. Their magnetic behaviors were analyzed by considering magnetic interactions between Ru(II,III) dimer and radical through pyridyl and N-O groups, respectively.