New homo- and hetero-bimetallic assemblies based on 2,5-bis(4-carboxyphenylamino)-3,6-dichloro-1,4-benzoquinone: synthesis, characterization, and magnetic properties
作者:Kumar Rakesh Ranjan、Aparna Singh、A. Banerjee、B. Singh
DOI:10.1080/00958972.2011.563382
日期:2011.4.20
Synthesis, characterization, and magnetic properties of a new series of dinuclear compounds MIIM'IIL2(H2O)4 (where MII, M'II = Mn (1), Ni (2), Cu (3) and MII = Cu, M'II = Co (4), Ni (5); LH2 = 2,5-bis(4-carboxyphenylamino)-3,6-dichloro-1,4-benzoquinone) are reported. These complexes were characterized by elemental analyses, FAB mass spectra, thermogravimetric analysis, spectroscopic techniques (infrared, NMR, UV-Vis), and powder XRD studies. Magnetic properties investigated by SQUID magnetometer show antiferromagnetic coupling between the metal centers connected by the extensive -delocalized ligand. Magnetic coupling constants (J) ranging from -1.01 to -3.01 cm-1 based on the Hamiltonian H = -2JSiSj have been obtained. The optimized geometry of the ligand derived from DFT is also reported.