Spectral, thermal, electrochemical and analytical studies on Cd(II) and Hg(II) thiosemicarbazone complexes

El‐Asmy, Ahmed A.; El‐Gammal, O.A.; Saleh, H.S.

doi:10.1016/j.saa.2007.11.018

Cited by 29 publications

(10 citation statements)

References 17 publications

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“…Also, the IR spectra of the complexes showed a new band at 464-521 cm −1 due to (M-O) vibration. The vanadyl complex showed a strong band, at 970 cm −1 , attributed to the (V O) vibration which is an evidence for the square-pyramidal configuration of the VO 2+ complex [17].…”

Section: Molecular Modeling Of H 6 Lmentioning

confidence: 93%

Ligational, analytical and biological applications on oxalyl bis(3,4-dihydroxybenzylidene) hydrazone

El‐Asmy

El‐Gammal

Radwan

et al. 2010

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Section: Molecular Modeling Of H 6 Lmentioning

confidence: 93%

Ligational, analytical and biological applications on oxalyl bis(3,4-dihydroxybenzylidene) hydrazone

El‐Asmy

El‐Gammal

Radwan

et al. 2010

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…The coordination toward each Cd (II) ion includes bi‐molecules of ligand, one acts as NNS‐donor set and the other is bonded by the oxygen atom of the SO 3 − group (Figure ). This behavior is revealed by the disappearance of the bands at 3058 and 1343 cm −1 assigned to ν(N 2 H) and ν(C=S) groups in the ligand, with the concurrent appearance of new bands at 1643 cm −1 assigned to the new ν(C=N) group . The bands at 1531 cm −1 assigned to ν(C=N) py in the IR spectrum of the ligand experience a shift to lower wavenumber, while the band at 662 cm −1 assigned to δ(C=N) py is shifted to a higher wavenumber.…”

Section: Resultsmentioning

confidence: 95%

“…This behavior is revealed by the disappearance of the bands at 3058 and 1343 cm −1 assigned to ν(N 2 H) and ν(C=S) groups in the ligand, with the concurrent appearance of new bands at 1643 cm −1 assigned to the new ν(C=N) group. [31] The bands at 1531 cm −1 assigned to ν(C=N) py in the IR spectrum of the ligand experience a shift to lower wavenumber, while the band at 662 cm −1 assigned to δ(C=N) py is shifted to a higher wavenumber. This confirms the complexation through the nitrogen of the pyridine ring.…”

Section: Infrared Spectramentioning

confidence: 99%

Synthesis, characterization, cyclic voltammetry and biological studies of Zn (II), Cd (II), Hg (II) and UO₂²⁺ complexes of thiosemicarbazone salt

Fetoh

Mohammed

Youssef

et al. 2019

Applied Organom Chemis

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Zn (II), Cd (II), Hg (II) and U (VI)O22+ complexes of water‐soluble thiosemicarbazone ligand (NaH3PyTSC) have been prepared and characterized using various techniques. Fourier transform‐infrared (FT‐IR) demonstrated that NaH3PyTSC ligand behaves as a binegative NOS tridentate in [Hg(H2PyTSC)(H2O)]2 and [UO2(H2PyTSC)(H2O)]2 complexes via the deprotonated SH, (C=N)az groups from one molecule and SO3− group from another molecule, while it behaves as a binegative NNSO tetradentate in [Cd(H2PyTSC)(H2O)2]2 complex through the deprotonated SH group, the SO3− group and the nitrogen of both the (C=N)az and (C=N)py. Finally, it behaves as a binegative OO bidentate in [Zn(H2PyTSC)(H2O)2]2·2H2O complex by the deprotonated OH group from one molecule and SO3− group from another ligand molecule. The spectral data suggest a tetrahedral coordination around Hg (II) and Zn (II) ions, and an octahedral coordination around Cd (II) and U (VI)O22+ ions. The NaH3PyTSC ligand exhibited maximum luminescent intensity at 501 nm, while Zn (II), Cd (II) and Hg (II) chelates show emission bands at 459, 458 and 358 nm, respectively. Two comparable methods were used to estimate various thermodynamic parameters. Cyclic voltammetry has been studied for Cd (II) complex in solution. Different biological applications of the isolated complexes have been estimated. It was found that [Cd(H2PyTSC)(H2O)2]2 showed the most effective antioxidant and anticancer activity.

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“…The shift of υ(C=O) to lower or higher wavenumbers with appearance of υ(C=N)*, υ(C–O) (due to enolization of one amidic group) [20] and υ(M–O) at 1550, 1140 and 463 cm −1 indicates the participation of carbonyl group in bonding. In the VO 2+ complex, the band observed at 3412 cm −1 is attributed to hydrated water [21] and absence of sulfate bands indicates enol type of complexes.…”

Section: Resultsmentioning

confidence: 99%

Spectral, thermal, molecular modeling and biological studies on mono- and binuclear complexes derived from oxalo bis(2,3-butanedionehydrazone)

El‐Asmy

Jeragh

Ali

2015

Chemistry Central Journal

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BackgroundHydrazones and their metal complexes were heavily studied due to their pharmacological applications such as antimicrobial, anticonvulsant analgesic, anti-inflammatory and anti-cancer agents. This work aims to synthesize and characterize novel complexes of VO2+, Co2+, Ni2+, Cu2+, Zn2+, Zr4+and Pd2+ ions with oxalo bis(2,3-butanedione-hydrazone). Single crystals of the ligand have been grown and analyzed.ResultsOxalo bis(2,3-butanedionehydrazone) [OBH] has a monoclinic crystal with P 1 21/n 1 space group. The VO2+, Co2+, Ni2+, Cu2+, Zn2+, Zr4+ and Pd2+ complexes have the formulas: [VO(OBH–H)2]·H2O, [Co(OBH)2Cl]Cl·½EtOH, [Ni2(OBH)Cl4]·H2O·EtOH, [Cu(OBH)2Cl2]·2H2O, [Zn(OBH–H)2], [Zr(OBH)Cl4]·2H2O, and [Pd2(OBH)(H2O)2Cl4]·2H2O. All complexes are nonelectrolytes except [Co(OBH)2Cl]Cl·½EtOH. OBH ligates as: neutral tetradentate (NNOO) in the Ni2+ and Pd2+ complexes; neutral bidentate (OO) in [Co(OBH)2Cl]Cl·½EtOH, [Zr(OBH)Cl4]·2H2O and [Cu(OBH)2Cl2]·2H2O and monobasic bidentate (OO) in the Zn2+ and VO2+ complexes. The NMR (1H and 13C) spectra support these data. The results proved a tetrahedral for the Zn2+ complex; square-planar for Pd2+; mixed stereochemistry for Ni2+; square-pyramid for Co2+ and VO2+ and octahedral for Cu2+ and Zr4+ complexes. The TGA revealed the outer and inner solvents as well as the residual part. The molecular modeling of [Ni2(OBH)Cl4]·H2O·EtOH and [Co(OBH)2Cl]Cl·½EtOH are drawn and their molecular parameters proved that the presence of two metals stabilized the complex more than the mono metal. The complexes have variable activities against some bacteria and fungi. [Zr(OBH)Cl4]·2H2O has the highest activity. [Co(OBH)2Cl]Cl·½EtOH has more activity against Fusarium.ConclusionOxalo bis(2,3-butanedionehydrazone) structure was proved by X-ray crystallography. It coordinates with some transition metal ions as neutral bidentate; mononegative bidentate and neutral tetradentate. The complexes have tetrahedral, square-planar and/or octahedral structures. The VO2+ and Co2+ complexes have square-pyramid structure. [Cu(OBH)2Cl2]·2H2O and [Ni2(OBH)Cl4]·H2O·EtOH decomposed to their oxides while [VO(OBH–H)2]·H2O to vanadium. The energies obtained from molecular modeling calculation for [Ni2(OBH)Cl4]·H2O·EtOH are less than those for [Co(OBH)2Cl]Cl·½EtOH indicating the two metals stabilized the complex more than mono metal. The Co(II) complex is polar molecule while the Ni(II) is non-polar.Graphical abstractElectronic supplementary materialThe online version of this article (doi:10.1186/s13065-015-0135-y) contains supplementary material, which is available to authorized users.

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Spectral, thermal, electrochemical and analytical studies on Cd(II) and Hg(II) thiosemicarbazone complexes

Cited by 29 publications

References 17 publications

Ligational, analytical and biological applications on oxalyl bis(3,4-dihydroxybenzylidene) hydrazone

Ligational, analytical and biological applications on oxalyl bis(3,4-dihydroxybenzylidene) hydrazone

Synthesis, characterization, cyclic voltammetry and biological studies of Zn (II), Cd (II), Hg (II) and UO₂²⁺ complexes of thiosemicarbazone salt

Spectral, thermal, molecular modeling and biological studies on mono- and binuclear complexes derived from oxalo bis(2,3-butanedionehydrazone)

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Spectral, thermal, electrochemical and analytical studies on Cd(II) and Hg(II) thiosemicarbazone complexes

Cited by 29 publications

References 17 publications

Ligational, analytical and biological applications on oxalyl bis(3,4-dihydroxybenzylidene) hydrazone

Ligational, analytical and biological applications on oxalyl bis(3,4-dihydroxybenzylidene) hydrazone

Synthesis, characterization, cyclic voltammetry and biological studies of Zn (II), Cd (II), Hg (II) and UO22+ complexes of thiosemicarbazone salt

Spectral, thermal, molecular modeling and biological studies on mono- and binuclear complexes derived from oxalo bis(2,3-butanedionehydrazone)

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Synthesis, characterization, cyclic voltammetry and biological studies of Zn (II), Cd (II), Hg (II) and UO₂²⁺ complexes of thiosemicarbazone salt