14.  Mononuclear and Binuclear Complexes Containing Barbituric Derivatives as Ligands-Precursors for Supramolecular Structures. II. Synthesis and Spectral Properties of Co(II) and Ni (II) Complexes Containing N,N-bis-(5,5-diethyl-barbituryl-1-methyl)-piperazine (VEP) as Ligand

Authors: Carmen Maria Bucovicean, Wolfgang Linert, Otilia Costisor


Abstract:

The new mononuclear complex CoVEP(X)2, where X = NCS-, and binuclear complex Ni2VEP(X)44H2O, X=ClO4- where VEP stands for N,N-bis-(5,5-diethyl-barbituryl-1-methyl)-piperazine, were obtained by metal - ligand direct synthesis. The nature of the complexes was established on the basis of elemental analyses and structural information were obtained from molar conductivity values in different solvents and UV VIS and IR spectra. Tetrahedral geometry of the metal ion is preserved in solution as well in solid state. Electronic spectra of mononuclear complex in DMSO and in solid state, indicate the distorted octahedral geometry around the Co(II) ion. The binuclear complexes contains VEP in a chair conformation. The mononuclear complex, CoVEP(NCS)2, contain the ligand VEP in a boat conformation.


Keywords: cobalt(II) and nickel(II) complexes; Mannich base ligand; barbituric acid derivative

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