Isonitrosoacetylacetone dithiosemicarbazone complexes of some first row transition metals

Abstract

Complexes of the potentially tetradentate ligand isonitrosoacetylacetone dithiosemicarbazone (inbtH2) of formulae [Ti(inbtH2)C12]C12, [M(inbt)], where M = VIVO, Mn II, Ni n or Zn n, [M(inbtH2)X2] , where M = Co II and X = C1, or M = Ni n and X = C1, Br or I, and [M(inbtH2)C12]C1, where M = Cr lu or Fe m, have been prepared and characterized by physico-chemical and spectroscopic methods.In all the compounds the metal is coordinated by the thiocarbonyl sulphur and imine nitrogen, as revealed by i.r. studies. The n.m.r, spectra of the complexes ofNi n and Zn ~ confirm coordination through nitrogen. Possible structures for the complexes are proposed. The M6ssbauer spectrum of the Fe II~ complex is discussed.

Synthesis, characterization and extraction studies of some metal (II) complexes containing (hydrazoneoxime and bis-acylhydrazone) moieties

“…3). However, the shift of the amide NH proton absorption to relatively lower field cannot be explained by the intramolecular hydrogen bonding but may be explained by the intermolecular hydrogen bonding since the amide and carbonyl groups of ligand can bond by intermolecular hydrogen bonding to produce dimmer with an s-cis conformation [37,38] (Fig. 4).…”

“…The IR spectra of L 1 H 2 exhibits a very broad medium intensity peak 3400-2600 cm À1 region, which are assigned to the intramolecular H-bonding vibration (OAHÁ Á ÁN) [37]. Also the amide NH stretching band of this ligand was not observed in the IR spectra probably due to overlapping with the intermolecular hydrogen-bonded OH stretching frequency, or maybe buried under broad band of OH.…”

“…Several commercial reagents some of which are phenolic oximes derived from salicylaldehyde or ketophenols have been used for copper recovery from sulfate, chloride, nitrate or ammonia media [1,2,4,8,9,37].…”

Synthesis, characterization and biological activities of transition metal chelates of 2-aminothiazole-derived Mannich bases

“…The covalency parameter (α 2 ) indicates considerable covalent character for the metal-ligand bond [40]. Also the trend g || > g ┴ > g e (2.0027) observed for these complexes indicates that the unpaired electron is most likely in the d x2−y2 orbital of the Cu(II) ion in complexes [41]. The EPR spectral assignments of the Cu(II) complexes are presented in Table 6.4 and spectra of the Cu(II) complexe are given in Fig.…”

Synthesis and Antimicrobial Activity of 2-((2-(Hydroxyimino)-1-Phenylpropylidene) Hydrazono)-1, 2-Diphenylethanone (HMPPH) and its Derivative

“…These compounds find several applications as sensitive and selective reagents in the detection and determination of several metal ions. In addition, many of these compounds possess a wide spectrum of biological activity 3 . The present paper deals with the preparation and characterization of the title ligand, viz.…”