ABSTRACT
Five new copper and zinc heteroleptic complexes with saccharin and aminoacids with general stoichiometry Na(2)[M(sac)(2)(aa)(2)].nH(2)O (M denotes Cu or Zn, sac the saccharinate ion, and aa the aminoacids) were synthesized and characterized by elemental and thermogravimetric analysis, conductimetric measurements and IR, Raman and UV-vis spectroscopies. In all the complexes, copper and zinc ions coordinated with the aminoacids through the terminal amine and carboxylate residues and with saccharin through the heterocyclic nitrogen atom. Besides, the superoxide dismutase-like activity of the heteroleptic copper complexes was evaluated and compared with the homoleptic copper amino acid complexes with the aim to observe the influence of the saccharin coordination.
Subject(s)
Amino Acids/chemistry , Carbohydrates/chemistry , Copper/chemistry , Zinc/chemistry , Spectrophotometry, Infrared , Spectrophotometry, Ultraviolet , Spectrum Analysis, Raman , Superoxide Dismutase/chemistry , ThermogravimetryABSTRACT
The infrared and Raman spectra of the copper(II) complexes [Cu(L-asn)2] and [Cu(L-gln)2] (L-asn=L-asparagine; L-gln=L-glutamine), were recorded and analyzed in relation to its structural peculiarities. Some comparisons between the spectra of these complexes and with those of related systems are made. The characteristics of the carboxylate and amide groups of the bonded ligands are discussed in detail.
Subject(s)
Asparagine/chemistry , Copper Sulfate/chemistry , Glutamine/chemistry , Spectrum Analysis, Raman , Amides/chemistry , LigandsABSTRACT
The molecular structure of the title complex, [Cu(C6H14N4O2)2(H2O)]CO3.H(2)O, was determined by single crystal X-ray diffractometry. It crystallizes in the monoclinic space group P2(1), with Z = 2. The Cu(II) ion is in a square pyramidal environment, trans coordinated at the basis by two argininate groups acting as bidentate ligands through their amino nitrogen and carboxylate oxygen atoms. The coordination around copper is completed by a water molecule at the pyramid apex. The infrared, Raman and electronic spectra are briefly discussed on the basis of the structural peculiarities of the complex.