SYNTHESES, STRUCTURES AND PHYSICAL PROPERTIES OF CYANIDE-BRIDGED M(II)−Ni(II) BIMETALLIC COMPLEXES WITH 2-PYRIDINEETHANOL (M(II) = Fe, Co and Ni)

Abstract

In this study, cyanide complexes with chemical formula [M(hepH)2Ni(μ-CN)2(CN)2] (hepH = 2-pyridineethanol; M = Fe(II), Co(II) and Ni(II); abbreviated to hereafter M-hepH-Ni) were obtained for the first time. The structures of these complexes were determined by using FT-IR and Raman spectroscopies, thermal and elemental analyses. The electrical and magnetic properties of the complexes were investigated by four-probe and Evans methods, respectively. Vibration assignments are obtained for all the observed bands and the spectral feature has been shown supported to the structure of complexes. Thermal behaviors of these complexes were examined using TG, DTG and DTA curves in the temperature range 30-700 °C in the static air atmosphere. According to thermal analysis curves, it has seen that neutral ligands (hepH) are released and cyanide ligands are decomposed in the complexes, followed usual decomposition mechanism. The final decomposition products are found to be the corresponding metal oxides. The magnetic measurements of the complexes are compared with experimental and theoretical values of the magnetic moment. Furthermore, Fe-hepH-Ni, Co-hepH-Ni and Ni-hepH-Ni complexes are determined to be paramagnetic.