Synthesis, characterization and magnetism of tetracarboxylato-bridges dinuclear nickel(II) complexes

• Autorzy: Yan C.W. , Li Y.T. , Sun H.T. , Liao D.Z.
• Języki publikacji: EN

Abstrakty

EN

Five new tetracarboxylato-bridges dinuclear nickel(II) complexes of the formula [Ni2(PMTA)L4], where L denotes 4,7-diphenyl-1,10-phenanthroline (Ph2-phen); 2,9-dimethyl-1,10-phenanthroline (Me2-phen); diaminoethane (en); 1,3-diaminopropane (pn) and 1,2-diaminopropane (ap); and PMTA represents the tetraanion of pyromellitic acid, have been synthesized and characterized by elemental analyses, molar conductivity and room temperature magnetic moment measurements, and by spectroscopy. It is proposed that these complexes have PMTA-bridged structures and consist of two nickel(II) ions in a distorted octahedral environment. The complexes [Ni2(PMTA)(Ph2-phen)4] (1) and [Ni2(PMTA)(Me2-phen)4] (2) were further characterized by variable temperature magnetic susceptibility measurements (4-300 K) and the observed data were treated in terms of two theoretical models, givinh the exchange integrals J=-2.85 cm(-1) for (1) and -1.96 cm(-1) for (2). The result indicates that there is very weakly antiferromagnetic spin-exchange intraction between two the Ni(II) ions within each molecule.

Słowa kluczowe

EN

my-tetracarboxylato; dinuclear complex; nickel(II); magnetic properties; synthesis

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 1998
• Tom: Vol. 72, nr 9
• Strony: 2045--2051
• Opis fizyczny: Bibliogr. 24 poz., tab., wykr.

Twórcy

autor

Yan C.W.

autor

Li Y.T.

autor

Sun H.T.

autor

Liao D.Z.