US EPA

3699722 

Journal Article 

New dinuclear cobalt (II, III) and tetranuclear manganese (III) complexes assembled by a polydentate Schiff-base ligand: synthesis, structure and magnetic properties 

Zhu, W; Zhang, S; Cui, C; Bi, F; Ke, H; Xie, G; Chen, S 

2014 

Yes 

Inorganic Chemistry Communications
ISSN: 1387-7003 

46 

315-319 

10.1016/j.inoche.2014.06.019 

WOS:000340309500076 

The reactions of 2-(((2-hydroxy-3-methoxyphenyl)methylene)amino)-2-(hydroxymethyl)-1,3-propanediol (H4L) and Mn(ClO4)(2)center dot 6H(2)O or Co(SCN)(2)center dot 3H(2)O in the presence of triethylamine in methanol led to the formation of two new complexes [Mn-4(III)(HL)(2)(H2L)(2)(CH3OH)(4)]center dot 4CH(3)OH center dot(ClO4)(2) (1) and [(CoCoIII)-Co-II(H2L)(2)(CH3OH)(SCN)]center dot 1.5CH(3)OH center dot 1.5H(2)O (2), respectively. According to structural data and magnetic properties tetranuclear complex 1 contains four homo-valence manganese (III) atoms, while in the binuclear complex 2 composed of hetero-valence bi- and trivalent cobalt (II, III) atoms. Weak antiferromagnetic exchange interactions between neighboring manganese ions in 1 have place. chi T-M for 2 was fitted using a model of isolated cobalt (II) ion with zero-field splitting parameters and the study confirms its mixed valence Co-II/Co-III nature. No slow magnetic relaxation effects were observed for both complexes in the absence of an applied dc magnetic field. (C) 2014 Elsevier B.V. All rights reserved. 

Polydentate Schiff base ligand; Manganese; Cobalt; Structural characterization; Magnetic property