New dinuclear cobalt (ΙΙ, ΙΙΙ) and tetranuclear manganese (ΙΙΙ) complexes assembled by a polydentate Schiff-base ligand: synthesis,structure and magnetic properties |
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| Affiliation: | 1. Key Laboratory of Synthetic and Natural Functional Molecular Chemistry of Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry & Material Science, Northwest University, Xi''an 710069, PR China;2. Xi''an Modern Chemistry Research Institute, Xi''an 710065, PR China;1. Department of Chemistry & Biochemistry, Georgia Southern University, Statesboro, GA 30460, USA;2. School of Chemistry & Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332-0400, USA;1. Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina 88040-900, Brazil;2. Instituto de Química, Departamento de Bioquímica, Universidade Federal do Rio de Janeiro, 21941-909, Brazil;3. Rede Micologia RJ – FAPERJ;4. Departamento de Química, Universidade do Estado de Santa Catarina, Joinville, Santa Catarina 89219-710, Brazil |
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| Abstract: | The reactions of 2-(((2-hydroxy-3-methoxyphenyl)methylene)amino)-2-(hydroxymethyl)-1,3-propanediol (H4L) and Mn(ClO4)2·6H2O or Co(SCN)2·3H2O in the presence of triethylamine in methanol led to the formation of two new complexes MnΙΙΙ4(HL)2(H2L)2(CH3OH)4]·4CH3OH·(ClO4)2 (1) and CoΙΙCoΙΙΙ(H2L)2(CH3OH)(SCN)]·1.5CH3OH·1.5H2O (2), respectively. According to structural data and magnetic properties tetranuclear complex 1 contains four homo-valence manganese (ΙΙΙ) atoms, while in the binuclear complex 2 composed of hetero-valence bi- and trivalent cobalt (ΙΙ, ΙΙΙ) atoms. Weak antiferromagnetic exchange interactions between neighboring manganese ions in 1 have place. χMT for 2 was fitted using a model of isolated cobalt (ΙΙ) ion with zero-field splitting parameters and the study confirms its mixed valence CoΙΙ/CoΙΙΙ nature. No slow magnetic relaxation effects were observed for both complexes in the absence of an applied dc magnetic field. |
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