This is the first review dealing with the coordination chemistry of metal complexes with Girard's reagents and their hydrazones. The short introduction points out to chemical properties and significance of these organic compounds. The next section briefly describes synthetic methods for preparing complexes with Girard's reagents, as well as modes of coordination of these ligands. The last two extensive sections review the preparation, stereochemistry and structural characteristics of metal complexes with Girard's hydrazones, including some newer non-hydrazonic derivatives of Girard's reagents, also.[Acknowledgments. Projekat Ministarstva nauke Republike Srbije, br. 172014
The reaction of warm EtOH solutions of FeX 3 . nH 2 O (X = Cl, NO 3 ) with tridentate ONX (X = O, S, N) pyridoxal semi-, thiosemi-and S-methylisothiosemicabazones (H 2 L 1 , H 2 L 2 , H 2 L 3 , respectively) yielded high-spin octahedral mono-and bis(ligand) complexes of the formula. H 2 O. The compounds were characterized by elemental analysis, conductometric and magnetochemical measurements, IR and UV-Vis spectra. Besides, a detailed voltammetric study of the complexes was carried out in DMF solution in the presence of several supporting electrolytes, to characterize the nature of the electrode processes and solution equilibria.
A new salt of Schiff base of aminoguanidine and 2-acetylpyridine, and its zinc(II) complex were obtained and their physicochemical and structural properties studied. The reaction of an aqueous solution of the chloride ligand salt and NH 4 NCS resulted in formation of the dithiocyanate ligand salt, L•2HNCS, while the reaction of the obtained salt with zinc(II) acetate gave a neutral complex of the formula [ZnL(NCS) 2 ]. In this complex, chelate ligand is coordinated in its neutral form, in a common tridentate NNN manner, via pyridine, azomethine and imino nitrogen atoms of the aminoguanidine fragment. This coordination mode results in formation of two strained five-membered metallocycles. Zinc(II) is situated in a distorted square-pyramidal environment of the tridentate ligand and one thiocyanate ion in the equatorial and the other thiocyanate ion in the apical position. The crystal structure of the ligand salt is stabilized by N-H … N and N-H … S interactions formed between the cationic and anionic species, while the three-dimensional crystal packing of the complex units is based on weak N-H … S interactions which involve the S acceptors from both NCS ligands.
The synthesis and structural characterization of a square-planar copper(II)
complex with pyridoxal S-methylisothiosemicarbazone (PLITSC) of the formula
[Cu(PLITSC?H)H2O]Br?H2O (1) as the first Cu(II) complex with monoanionic
form of this ligand were described. Complex 1 together with two previously
synthesized complexes [Cu(PLITSC)Br2] (2) and [Cu(PLITSC)Br(MeOH)]Br (3)
were characterized by elemental analysis, IR and electronic spectra and also
by the methods of thermal analysis, conductometry and magnetochemistry.
[Projekat Pokrajisnkog sekretarijata za nauku i tehnoloski razvoj Vojvodine
i Ministarstva nauke Republike Srbije, br. 172014]
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