Syntheses, structural characterization and spectroscopic studies of cadmium(II)-metal(II) cyanide complexes with 4-(2-aminoethyl)pyridine

Abstract

Three new cadmium(II)-metal(II) cyanide complexes, [Cd(4aePY)(2)(H2O)(2)][Ni(CN)(4)] (1), [Cd(4aePY)(2)(H2O)(2)][Pd(cN)(4)] (2) and [Cd(4auPY)(2)(H2O)(2)][Pt(CN)(4)] (3) [4aepy = 4-(2-aminnethyl)pyridine], have been synthesized and characterized by elemental, thermal, FT-IR and Raman spectral analyses. The crystal structures of 1 and 2 have been determined by single crystal X-ray diffraction technique, in which they crystallize in the monoclinic system and C2/c space group. The M(II) [M(II) = Pd(II) and Pt(II)] ions are coordinated with the carbon atoms of the four cyanide groups in the square planar geometries and the [M(CN)(4)](2-) ions act as counter ions. The Cd(II) ions display an N4O2 coordination sphere with a distorted octahedral geometry, the nitrogen donors belonging to four molecules of the organic 4aepy that act as unidentate ligands and two oxygen atoms from aqua ligands. 3D supramolecular structures of 1 and 2 were occurred by M center dot center dot center dot pi and hydrogen bonding (N-H center dot center dot center dot N and O-H center dot center dot center dot N) interactions. Vibrational assignments of all the observed bands were given and the spectral properties were also supported the crystal structures of the complexes. A possible decompositions of the complexes were investigated in the temperature range 30-800 degrees C in the static atmosphere