Titre du document / Document title
Structures and magnetic properties of transition metal complexes of 1,3,5-benzenetricarboxylic acid
Auteur(s) / Author(s)
WANRU ZHANG ;
BRUDA Sandra ;
LANDEE Christopher P. ;
PARENT Judith L. ;
TURNBULL Mark M. ;
Résumé / Abstract
Treatment of the potassium salt of 1,3,5-benzenetricarboxylic acid with transition metal ions in aqueous solution produced a series of coordination complexes. Reaction of Ni(ClO
4)
2.6H
2O with K
3[C
6H
3(CO
2)
3] gave complexes 1, Ni
3[C
6H
3(CO
2)
3]
2(H
2O)
14. 4H
2O. The compound crystallized as trimers with two terminal Ni(H
2O)
5 units bridged by two benzenetricarboxylate ligands to a central Ni(H
2O)
4. Magnetic susceptibility data indicate the presence of either weak antiferromagnetic interactions between metal ions, or single ion anisotropy. Reaction of Co(ClO
4)
2.6H
2O with K
3[C
6H
3(CO
2)
3] gave complexes 2. Co
3[C
6H
3(CO
2)
3]
2(H
2O)
12. The complexes exists as a pendant chain coordination polymer with both bridging and terminal Co
2+ ions. Each cobalt center is also coordinated to four water molecules. A systematic linear decrease in effective moment is observed below 100 K. This decrease can be understood entirely in term of crystal field and spin-orbit coupling effects on the individual Co(II) ions and implies magnetic interaction are weak. Magnetic susceptibility data were also obtained for the Co BTCA complexes 3, Co(BTCA)(py)
2.0.67py. These data can also be described as arising solely from single-ion effects due to the non-cubic environment around the Co
2+ ion with no evidence of the presence of magnetic interactions. Reaction of Mn(ClO
4)
2.6H
2O with K
3[C
6H
3(CO
2)
3] gave complexes 4, Mn
3(C
6H
3(CO
2)
3)
2.8H
2O. Magnetic susceptibility data indicate weak antiferromagnetic interactions and suggest that the complexes have a low dimensional structures.
Revue / Journal Title
Inorganica chimica acta
ISSN
0020-1693
CODEN ICHAA3
Source / Source
2003, vol. 342, pp. 193-201 [9 page(s) (article)]
Langue / Language
Anglais
Editeur / Publisher
Elsevier, Amsterdam, PAYS-BAS
(1967)
(Revue)
Localisation / Location
INIST-CNRS, Cote INIST : 14114, 35400010367432.0240
Nº notice refdoc (ud4) : 14453142
