Binuclear complexes containing barbituric derivatives as ligands-precursors for supramolecular structures. I. Synthesis and spectral properties of N,N’-bis-(5,5’-diethyl-barbituryl-1-methyl)-piperazine (VEP) and its copper(II) complex [articol]

Abstract

The new Mannich base VEP (N,N’-bis-(5,5’-diethyl-barbituryl-1-methyl)-piperazine), has been synthetized by condensation of veronal with formaldehyde and piperazine following a Mannich procedure. The new binuclear complex Cu2VEP(X)4·4H2O , X=ClO4- where VEP stands for N,N’-bis-(5,5’-diethyl-barbituryl-1-methyl)-piperazine, were obtained by metal - ligand direct synthesis. Tetrahedral geometry of the metal ion was preserved in solution as well in solid state. The binuclear complex contain VEP in a chair conformation.