Physical and spectroscopic studies on novel vanadyl complexes of some substituted thiosemicarbazides

El-Metwally, Nashwa M.; El-Shazly, Rafat M.; Gabr, I.M.; El‐Asmy, Ahmed A.

doi:10.1016/j.saa.2004.06.027

Cited by 104 publications

(40 citation statements)

References 18 publications

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“…The magnetic moment values ( Table 1) of the oxovanadium(IV) complexes of H 2 L 1 and H 2 L 2 ligands are 1.42 and 1.00 BM, respectively. These values are lower than reported (1.74-2.10 BM) and refer to the interaction of the oxovanadium(IV) ion with neighboring central ions [61].…”

Section: Electronic Spectra and Magnetic Moment Measurementscontrasting

confidence: 62%

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Synthesis, spectral, X-ray diffraction, antimicrobial studies, and DNA binding properties of binary and ternary complexes of pentadentate N2O3 carbohydrazone ligands

Shebl

Khalil

2014

Monatsh Chem

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Two pentadentate carbohydrazone ligands, H 2 L 1 and H 2 L 2 , were prepared by the reaction of the bifunctional compound carbohydrazide with 2-hydroxy-5-nitrobenzaldehyde and 2-hydroxy-1-naphthaldehyde, respectively. Reactions of the ligands with oxovanadium(IV), cerium(III), thorium(IV), and dioxouranium(VI) ions yielded binary complexes. Reactions of the ligands with the dioxouranium(VI) ion in the presence of secondary ligands (8-hydroxyquinoline, glycine, salicylaldehyde, or benzoylacetone) yielded ternary complexes. The ligands and metal complexes were characterized by different techniques such as elemental and thermal analyses, IR, 1 H and 13 C NMR, electronic, ESR, mass spectra, and powder XRD as well as magnetic susceptibility and conductivity measurements. The coordinating sites are phenolic oxygen, azomethine nitrogen, and carbonyl oxygen. In complexes, the ligands act as dibasic pentadentate except ternary dioxouranium(VI) complexes, obtained using glycine or benzoylacetone, in which the ligands act as monobasic pentadentate. The XRD patterns for the H 2 L 1 ligand, its binary dioxouranium(VI) complex, and its 8-hydroxyquinoline ternary complex indicate crystalline nature and the grain size was estimated. The H 2 L 1 ligand and its binary complex have triclinic systems while the ternary complex has a monoclinic system with different unit-cell parameters. The ligands and some of their metal complexes showed antimicrobial activity toward some Gram-positive and Gram-negative bacteria, yeast (Candida albicans), and fungus (Aspergillus fumigatus), and MIC values were determined. The DNA binding properties of the oxovanadium(IV) complexes of H 2 L 1 and H 2 L 2 ligands were investigated by electronic absorption spectroscopy and viscosity measurements. The results indicated that these complexes bind to DNA via an intercalation binding mode with an intrinsic binding constant K b of 2.55 9 10 4 and 3 9 10 4 M -1 , respectively.

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Section: Electronic Spectra and Magnetic Moment Measurementscontrasting

confidence: 62%

“…2 B 1 (m 2 ) transition in an octahedral geometry [61,62]. In addition, the V=O stretching frequencies for the complexes appeared in the range 954-980 cm -1 supporting the octahedral geometry of the complexes [63,64].…”

Section: Electronic Spectra and Magnetic Moment Measurementsmentioning

confidence: 63%

Synthesis, spectral, X-ray diffraction, antimicrobial studies, and DNA binding properties of binary and ternary complexes of pentadentate N2O3 carbohydrazone ligands

Shebl

Khalil

2014

Monatsh Chem

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“…This is also confirmed by the appearance of bands in the range of 418 -428 cm -1 , this has been assigned to the ν(M-N) [27,28]. And the appearance of bands in the range of 490 -501 cm -1 , this has been assigned to the ν(M-O).…”

Section: Infrared Spectrasupporting

confidence: 56%

“…814 cm -1 ν(C=S) and at 1657 cm -1 ν(C=O) in the IR spectral of ligand is shifted towards lower wave number. It indicates that thione sulphur and also the enolic oxygen coordinates to the metal ion [27]. Thus the ligand behaves as tridentate in bath saide chelating agent coordinating through azomethine nitrogen, thiolate sulphur and enolic oxygen.…”

Section: Infrared Spectramentioning

confidence: 99%

Kinetic parameters and thermal decomposition for Novel 1,1-Malonyl-bis(4-p-Chlorophenylthiosemicarbazide) and Cu(II), Co(II), Zn(II) and Sn(II) complexes(H<sub>4</sub>pClMaTS) synthesized by electrochemical method

Amin¹,

Yamany²,

Abo-Aly³

et al. 2011

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HNMR, mass), thermal, and ESR studies. The Raman and infrared spectral studies suggests the tridentate behavior of the ligand from each tail. Since the ligand has two thiosemicarbazide groups, it may acts in an SNO tridentate fashion from each side with one of the two metal ions forming a polynuclear complex coordinating through both of the lone pair of electrons the enolic oxygen of the carbonyl group (C=O), the azomethine nitrogen (C=N) and the thioenol form of the thiocarbonyl group (C=S). The differential thermogravimetric analysis (DTG) curves were used to study the decomposition steps of the isolated complexes using Horowitz-Metzger (HM) and Coats-Redfern (CR) methods. The kinetic thermodynamic parameters such as: E*, ∆H*, ∆S*and ∆G* are calculated from the DTG curves.

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“…The electronic spectrum of [VO(L 1 )(2,4-pentadionate)] Cl·4HCl complex ( Figure S25) ion [33]. Moreover, the value of the corrected magnetic moment (µ eff = 3.01 BM) per each V 4+ ion is taken an evidence for existence of two vanadium atoms [36].…”

Section: Electronic and Magnetic Measurementsmentioning

confidence: 99%

New Square-Pyramidal Oxovanadium (IV) Complexes Derived from Polydentate Ligand (L<sup>1</sup>)

Hassoon¹,

Al‐Radadi²,

Nawar³

et al. 2016

OJIC

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Physical and spectroscopic studies on novel vanadyl complexes of some substituted thiosemicarbazides

Cited by 104 publications

References 18 publications

Synthesis, spectral, X-ray diffraction, antimicrobial studies, and DNA binding properties of binary and ternary complexes of pentadentate N2O3 carbohydrazone ligands

Synthesis, spectral, X-ray diffraction, antimicrobial studies, and DNA binding properties of binary and ternary complexes of pentadentate N2O3 carbohydrazone ligands

Kinetic parameters and thermal decomposition for Novel 1,1-Malonyl-bis(4-p-Chlorophenylthiosemicarbazide) and Cu(II), Co(II), Zn(II) and Sn(II) complexes(H<sub>4</sub>pClMaTS) synthesized by electrochemical method

New Square-Pyramidal Oxovanadium (IV) Complexes Derived from Polydentate Ligand (L<sup>1</sup>)

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Physical and spectroscopic studies on novel vanadyl complexes of some substituted thiosemicarbazides

Cited by 104 publications

References 18 publications

Synthesis, spectral, X-ray diffraction, antimicrobial studies, and DNA binding properties of binary and ternary complexes of pentadentate N2O3 carbohydrazone ligands

Synthesis, spectral, X-ray diffraction, antimicrobial studies, and DNA binding properties of binary and ternary complexes of pentadentate N2O3 carbohydrazone ligands

Kinetic parameters and thermal decomposition for Novel 1,1-Malonyl-bis(4-p-Chlorophenylthiosemicarbazide) and Cu(II), Co(II), Zn(II) and Sn(II) complexes(H&lt;sub&gt;4&lt;/sub&gt;pClMaTS) synthesized by electrochemical method

New Square-Pyramidal Oxovanadium (IV) Complexes Derived from Polydentate Ligand (L&lt;sup&gt;1&lt;/sup&gt;)

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Kinetic parameters and thermal decomposition for Novel 1,1-Malonyl-bis(4-p-Chlorophenylthiosemicarbazide) and Cu(II), Co(II), Zn(II) and Sn(II) complexes(H<sub>4</sub>pClMaTS) synthesized by electrochemical method

New Square-Pyramidal Oxovanadium (IV) Complexes Derived from Polydentate Ligand (L<sup>1</sup>)