Ferromagnetic coupling in a novel dicyanamide-bridged dinuclear gadolinium(III)complex [Gd_2(dca)_4(OH)_2(NITpPy)_4](NITpPy=4-pyridyl-nitronyl nitroxide radical)

摘要

The novel six-coordinated gadolinium(III)complex of formula [Gd_2(dca)_4(OH)_2(NITpPy)_4](1)(dca=dicyanamide,NITpPy=4-pyridyl-4,4,5,5-tetrarnethyl-4,5-dihydro-lH-imidazolyl-oxy-3-oxide)has been prepared and characterized by X-ray crystallography.Compound 1 is a dimer structure made up of double mu_(1,5)-dca-bridged gadolinium(III)ions and one terminal dca ligand;variable-temperature magnetic susceptibility measurements reveal the occurrence of a significant ferromagnetic interaction directly spin polarization through the NITpPy-Gd(III)-NITpPy pathway with J=11.56 cm~(-1).