Magnetic properties and crystal structure of a (CuGdIII)-Gd-II heterodinuclear Schiff base complex
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES, vol.59, no.5, pp.535-540, 2004 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 59 Issue: 5
- Publication Date: 2004
- Journal Name: ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.535-540
- Keywords: heterodinuclear complex, copper, gadolinium, crystal structure, magnetic properties, MOLECULAR-STRUCTURE, CU, GADOLINIUM(III), LANTHANIDE, BEHAVIOR
- Ankara University Affiliated: No
Abstract
The crystal structure and the magnetic properties of a heterodinuclear complex, [LCu(Me2CO)Gd(NO3)(3)](2) (L=N,N'-bis(2-hydroxy-3-methoxybenzylidene)-1,3-diaminopropane) are reported: [(C19H20N2O4)Cu(C3H6O)Gd(NO3)(3)](2), triclinic, space group PI, with a = 12.118.3(9), b = 13.562(3), c = 9.391(3) Angstrom, alpha = 93.03(3), beta = 107.65(2), gamma = 73.07(2)degrees, V = 1406.0(7) Angstrom(3), Z = 1. The crystal structure consists of two independent binuclear (CuGdIII)-Gd-II complexes and two non-coordinating acetone molecules in the asymmetric unit. The central region of the complexs is occupied by Cu-II and Gd-III ions which are bridged by two phenolato oxygen atoms of the ligand. The Cu-II ion is in a square-planar geometry and coordinated by four donor atoms of the ligand (N2O2). The Gd-III ion is deca-coordinated. In addition to the two phenolate oxygen atoms, its coordination sphere contains two oxygen atoms of the OMe side arms of L and six oxygen atoms from the three bidentate nitrate ions. The average (CuGd)-Gd-... separation is 3.375(2) Angstrom. The chiT versus T plots, chi being the molar magnetic susceptibility per (CuGdIII)-Gd-II unit and T the temperature, has been measured in the 4 - 347 K range. The values of the intrachain interaction parameters have been deduced from the magnetic data: J = 7.4 cm(-1), g(Cu) = 2.12, g(Gd) = 2.06. This indicates a weak ferromagnetic spin exchange interaction between Cu-II and Gd-III ions. The nature of the magnetic super-exchange interaction of the title compound is compared with similar (CuGdIII)-Gd-II heterodinuclear complexes.