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Synthesis and structural characterization of a series of transition metal complexes with a tetradentate Schiff-base ligand derived from salicylaldehyde and 2-(2-aminoethylamino)ethanol

Mikuriya M., Matsunami K.

Materials Science Poland

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2005

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Vol. 23, No. 3

773--792

EN

A series of transition metal complexes with 1-[(2-hydroxyethyl)amino]-2-(salicylideneamino)ethane (H2hase), [V(Hhase)2]Cl (1), [VO2(Hhase)] (2), [Cr(Hhase)2]Cl (3), [Mn(Hhase)2]Cl (4), [Fe(Hhase)2]Cl (5), [Co(Hhase)2]Cl (6), [Co(Hhase)2]Br (7), [Co(Hhase)2]I (8), [Co(Hhase)2]NO3 (9), [Co(Hhase)2]NCS (10), [Co(Hhase)2]ClO4 (11), and [Co(Hhase)2]CH3CO2.H2O (12), have been synthesized by template reactions of salicylaldehyde and 2-(2-aminoethylamino)ethanol with metal salts and characterized by measurements of the infrared and electronic spectra, and magnetic moments. The molecular structures of these complexes were determined by the singlecrystal X-ray structure analysis. All the complexes except for 2 are mononuclear with an octahedral metal(III) ion, where the two Hhase ligands act a meridional tridentate chelate forming hydrogen bondings with counter anion. The two Hhase ligands are arranged so that the imino-nitrogen atoms are trans while the phenoxo-oxygen atoms and the aminonitrogen atoms are cis, respectively. Complex 2 is dinuclear of vanadium(V) with dioxobridges. A similar template reaction with copper(II) afforded Cu(salen) (H2salen = N,N'-bis(salicylidene)ethylendiamine) (13) in a low yield.

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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

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2005

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Vol. 23, No. 3

765--771

EN

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.

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Thiolato-bridged copper complexes with N,N,S-tridentate ligands

Kotera T., Fujita A., Mikuriya M., Handa M.

Materials Science

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2003

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Vol. 21, No. 2

171-179

EN

Thiolato-bridged complexes [CuII2(apaet)Cl3] and [CuI3CuII3(apampt)3Cl6] (Hapaet = 2-[(3-aminopropyl)amino]ethanethiol, Hapampt = 1-[(3-aminopropyl)amino]-2-methylpropane-2-thiol), have been synthesized and characterized by infrared and electronic absorption spectra and temperature dependence of magnetic susceptibilities. X-ray crystallography of the latter complex reveals a localized mixed-valence structure which is supported by the spectroscopic and electrochemical data. Magnetic susceptibility data show that a strong antiferromagnetic interaction is operating between CuII ions in both the complexes.

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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

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2003

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Vol. 21, No. 2

199-206

EN

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.