Synthesis, spectral and structural studies of 1-ethoxycarbonyl-piperazine-4-carbodithioate and its Co(III), Zn(II) and Cd(II) complexes
摘要:
The new complexes [Co(ecpzdtc)(3)] (2) [Zn(ecpzdtc)(2)(py)] (3) and [Cd(ecpzdtc)(2)(py)]center dot H2O (4) have been synthesized from sodium 1-ethoxycarbonyl-piperazine-4-carbodithioate [(Na+(ecpzdtc)(-)]. The ligand and the complexes have been characterized by elemental analyses, IR, magnetic susceptibility and single crystal X-ray data. The [Zn(ecpzdtc)(2)(py)] and [Cd(ecpzdtc)(2)(py)]center dot H2O complexes contain pyridine as the co-ligand. [Co(ecpzdtc)(3)] (2) crystallizes in the monoclinic system, whereas [Zn(ecpzdtc)(2)(py)] (3) and [Cd(ecpzdtc)(2)(py)]center dot H2O (4) crystallize in the triclinic system. The sulfur donor sites of the bidentate ligand chelate the metal center, forming a four-membered CS2M ring. The cobalt complex has a distorted octahedral geometry, the zinc complex is almost between trigonal bipyramidal and square pyramidal, whereas the cadmium complex is square pyramidal. The crystal structures of all the complexes are stabilized by various types of inter and intramolecular hydrogen bonding. (C) 2011 Elsevier Ltd. All rights reserved.