Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 Polish Journal of Chemistry

1 1998

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: my-tetracarboxylato

Sortuj według:

Ogranicz wyniki do:

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

Yan C.W., Li Y.T., Sun H.T., Liao D.Z.

Polish Journal of Chemistry

1998

Vol. 72, nr 9

2045-2051

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.