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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(ClO4)2.6H2O with K3[C6H3(CO2)3] gave complexes 1, Ni3[C6H3(CO2)3]2(H2O)14. 4H2O. The compound crystallized as trimers with two terminal Ni(H2O)5 units bridged by two benzenetricarboxylate ligands to a central Ni(H2O)4. Magnetic susceptibility data indicate the presence of either weak antiferromagnetic interactions between metal ions, or single ion anisotropy. Reaction of Co(ClO4)2.6H2O with K3[C6H3(CO2)3] gave complexes 2. Co3[C6H3(CO2)3]2(H2O)12. The complexes exists as a pendant chain coordination polymer with both bridging and terminal Co2+ 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 Co2+ ion with no evidence of the presence of magnetic interactions. Reaction of Mn(ClO4)2.6H2O with K3[C6H3(CO2)3] gave complexes 4, Mn3(C6H3(CO2)3)2.8H2O. 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



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