Sharif Digital Repository

The saccharinato complexes [Zn(phen)2(sac)(H2O)]sac (1) and [Zn(sac)(dmp)(H2O)](sac) (2), where phen = 1,10-phenanthroline, dmp = 2,9-dimethyl-1,10-phenanthroline, and sac = saccharinato ion/ligand, were synthesized by the reaction of [Zn(sac)2(H2O)4] · 2H2O with ligands and have been characterized by elemental analysis, IR, and 1H NMR spectroscopies. Conductivity of complexes was measured in DMSO. Compound 1 is characterized by single crystal X-ray diffraction and compared with some isomorphous zinc-saccharinate complexes reported previously. Complex 1 crystallizes in the triclinic system, space group P1̄, with Z = 2, and consists of alternating slightly distorted octahedral... 

Tridentate Schiff-base ligands derived from condensation of 3-formyl-4-hydroxybenzyl-triphenylphosphonium chloride with glycine, L-alanine, L-valine, L-leucine and L-phenylalanine in the presence of Zn(OAc)2·2H2O form five new water-soluble Zn(II) complexes, which were characterized by elemental analyses, IR, electronic absorption and 1H, 13C NMR spectroscopies. In the IR spectra of the complexes, the difference between the asymmetric and the symmetric carboxylate stretching frequencies is larger than ∼210 cm-1, which implies that the carboxylate groups are monodentate. UV-Vis electronic absorption studies show that Zn(II) functions as a trap for the Schiff-base intermediate. Schiff-base... 

New water-soluble zinc(II) Schiff-base complexes derived from amino acids (glycine, L-phenylalanine, and L-valine) and salicylaldehyde-5-sulfonates (sodium salicylaldehyde-5-sulfonate and sodium 3-methoxy-salicylaldehyde-5- sulfonate) have been synthesized. The complexes were characterized by elemental analysis, IR, electronic, 1H NMR, and 13C NMR spectra. In the IR spectra of the complexes, the large difference between the asymmetric νas(COO) and symmetric νs(COO) carboxylate stretch, Δν(νas(COO)-νs(COO)) of 199-247 cm-1, indicates monodentate coordination of the carboxylate group. Spectral data showed that in these complexes the ligand is a tridentate ONO moiety, coordinating to the metal... 

The direct electrosynthesis of neutral copper(II) and zinc(II) complexes of a new unsymmetrical carboxamide ligand, N,N′-bis(2-pyridinecarboxamide)-2-aminobenzylamine (H2bpabza) derived from 2-pyridinecarboxylic acid and 2-aminobenzylamine, was accomplished by electrochemical oxidation of anodic metals (copper and zinc) in an acetonitrile solution of the ligand. These compounds were characterized by elemental analyses and different spectroscopic methods. The crystal and molecular structures of the ligand, H2bpabza, and its copper complex, Cu(bpabza), were determined by X-ray diffraction. The copper atom adopts a distorted square-pyramidal (4 + 1) CuN2N′N″O coordination geometry with bpabza2-...