Wyniki wyszukiwania - Biblioteka Nauki

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

1 Polish Journal of Chemistry

1 2001

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Synthesis, Characterization and Magnetic Properties of mi-Oxalato-Bridged Binuclear Iron(III) Complexes

100%

Li Y. T. , Yan C. W. , Zhang Y. H.

tom Vol. 75, nr 12

1825-1831

Four new oxalato-bridged iron(FII)-iron(III) binuclear complexes have been synthesized and characterized, namely [Fe2(ox)jL2], where ox represents the oxalato dianions; L stands for 2,9-dimethyl-1,10-phenanthroline (Mc2-phen); 4,7-diphenyl-1,10-phenanthroline o:'"o (Ph2-phen); diaminoethane (en) or l ,3-diaminopropane (pn), respectively. Based on elemental analyses, molar conductivity and magnetic moment (at room-temperature) measurements, IR and electronic spectral studies, these complexes arę proposed to have extended ox-bridged structure consisting of two iron(IIl) ions, each in an octahedral environment. The variab!e-teinperature susceptibilities of [Fe2(ox)](Me2-phen)2] (1) and [Fe2(ox))(Ph2-phen)j] (2) complexes were measured and studied in the 4.2-300 K range. The magnetic coupling parameter is consistent with an antiferromagnetic exchange in-teraction between the iron(FFI) ions through the oxalato-bridged in both complexes (1) and (2). Based on the spin Hamiltonian operator, H = 2JS i -S 2, the exchange parameters (J) were evaluated as -4.85 cm"' for (I) and J = -6.39 crrf' for (2).