Synthesis and characterization of transition metal complexes of N′-[(1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)methylene]thiophene-2-carbohydrazide

Abstract

A hydrazone ligand (HL) containing the thiophene moiety has been prepared via condensation of thiophene-2-carbohydrazide with 1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazole-4-carbaldehyde. The complexes of copper(II), nickel(II), cobalt(II), manganese(II), zinc(II), palladium(II), iron(III), ruthenium(III), uranyl(VI), and titanium(IV) with the ligand were prepared in good yield from the reaction of the ligand with the corresponding metal salts. The ligand and complexes were characterized using infrared, mass spectra, nuclear magnetic resonance, electronic absorption spectra, electron spin resonance, and magnetic moment measurements as well as elemental and thermal analyses. The results showed that the complexes are enolic by nature, whilst the ratio between the metal ion and the ligand depends on the acidity of the metallic ions and their oxidation numbers.

Preparation, characterization and Microbicide activities of N'-((3-(hydroxyimino)butan-2-ylidene)-2-(phenylamino)acetohydrazide and its complexes

“…Two bands observed at 1641 and 1605 cm -1 related to the two C=N of imine and oxime groups [49], while the bands observed at 1144 and 1025 cm -1 were attributed to the υN-O group [50]. The Presence of NH groups was supported by the bands recorded at 3338, 3290 and 3260 cm -1 [51][52][53]. Based on variation in the IR spectra of the metal complexes in comparison to that of the ligand, it could be presumed that the ligand performed either as a neutral (bidentate or tridentate), or monobasic .…”

“…The broadness of this band indicates unequal energies of the OU charge transfer in the two oxo cations. The other band observed at 410 and 415 nm is assignable to charger transfer from ligand to the uranium(VI) ion (LMCT) [51,65,74].…”

Study of Some Parameters on the Rate of the Catalyzed Decomposition of Hydrogen Peroxide by [H5LFe2(II)(SO4)2.H2O]Complex

“…Are illustrated in Fig. (8).and equation (12): ΔG = ΔH -TΔS (12) ) are being formed at the start of reaction [9]in all cases studied an induction period has been encountered before the reaction assumes a significant rate. These results showed also that the induction period (t ind ) is largely by the amount of catalyst and the temperature of the reaction.…”

Anti‐proliferative activity of newly synthesized Cd(II), Cu(II), Zn(II),Ni(II), Co(II), VO(II), and Mn(II) complexes of 2‐((4,9‐dimethoxy‐5‐oxo‐5H‐furo[3,2‐g]chromen‐6‐yl)methylene) hydrazinecarbothioamide on three human cancer cells

“…[65] In addition, the spectra of all complexes showed new peaks observed in the 410-475 nm range which could be attributed to the charge-transfer ones. [66] The diamagnetic zinc(II) and cadmium(II) complexes (2) and (3) have d 10 system, so it does not show d-d…”