Crystal structure and magnetic properties of a new hetero-dinuclear (CuMnII)-Mn-II Schiff base complex

Elerman Y., Elmali A., Zeyrek C., Svoboda I., Fuess H.

ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES, vol.58, no.4, pp.271-277, 2003 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 58 Issue: 4
  • Publication Date: 2003
  • Doi Number: 10.1515/znb-2003-0405
  • Journal Name: ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.271-277
  • Keywords: hetero-dinuclear (CuMnII)-Mn-II complex, super-exchange interactions, antiferromagnetic interaction, MOLECULAR-BASED FERROMAGNET, ELECTRON-PARAMAGNETIC-RES, BIMETALLIC CHAINS, STATE, CU, DESIGN, ION, FE, CO, NI
  • Ankara University Affiliated: No

Abstract

Mn[Cu(L)(O2CMe)(2)].H2O (L = N,N'-bis(2-hydroxy-3-methoxybenzylidene)-1,3-diaminopropane) was synthesized and the crystal structure determined. (C23H26CuMnN2O8).H2O, monoclinic, space group P2(1)/c, a = 12.017(3), b = 8.217(3), c = 24.786(4) Angstrom, beta = 92.10(2)degrees, V = 2446(l) Angstrom(3), Z = 4. The crystal structure consists of ordered dinuclear units with Cu-II and Mu(II) ions bridged by two oxygen atoms of the Schiff base ligand. The Cu-II coordination sphere is a slightly distorted square-plane formed by the N2O2 donor set of the Schiff base ligands. The average Cu-O and Cu-N distances are 1.920(l) and 1.957(4) Angstrom, respectively. The coordination around the Mull ion is a distorted tetrahedron with the donor oxygen atoms of the Schiff base ligands and oxygen atoms of the acetate anions. The Cu-... Mn separation is 3.327(4) Angstrom. There is also one non-coordinating water molecule in the crystal structure. The chi and chiT versus T plots, chi being the molar magnetic susceptibility per Cu-II Mn-II unit and T the temperature, has been measured in the 4.9 - 301 K temperature ran-e. The values of the interaction parameters are J = -28.3 cm(-1), g(Mn) = 2.01, g(Cu) = 2.07. This indicates an intramolecular antiferromagnetic interaction between Cu-II and Mn-II ions.