Thermal and spectral studies of 3-N-methyl-morpholino-4-amino-5-mercapto-1,2,4-triazole and 3-N-methyl-piperidino-4-amino-5-mercapto-1,2,4-triazole complexes of cobalt(II), nickel(II) and copper(II)

Maravalli, P. B.; Goudar, T. R.

doi:10.1016/s0040-6031(98)00548-6

Cited by 143 publications

(33 citation statements)

References 9 publications

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“…Their activation energies found to be 98 and 242 kJ mol -1 , respectively. It is found that the release of the coordinated water molecules and chloride atoms fairly accord with literature [42,43].…”

Section: Thermal Analysissupporting

confidence: 87%

Biheterocyclic ligands: synthesis, characterization and coordinating properties of bis(4-amino-5-mercapto-1,2,4-triazol-3-yl) alkanes with transition metal ions and their thermokinetic and biological studies

et al. 2008

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Abstract:The Co(II), Ni(II) and Cu(II) metal ions complexes of Bis (4-amino-5-mercapto-1,2,4-triazol-3-yl) alkanes (BATs) have been prepared and characterized by elemental analysis, conductivity measurements infrared, magnetic susceptibility, the electronic spectral data and thermal studies. Based on spectral and magnetic results, the ligands are tetradentate coordinating through the N and S-atoms of BATs; six-coordinated octahedral or distorted octahedral and some times four-coordinated square planar were proposed for these complexes. Activation energies computed for the thermal decomposition steps were compared. The ligands and their metal complexes were tested in vitro for their biological effects. Their activities against two gram-positive, two gram-negative bacteria and two fungal species were found to vary from moderate to very strong.

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Section: Thermal Analysissupporting

confidence: 87%

Biheterocyclic ligands: synthesis, characterization and coordinating properties of bis(4-amino-5-mercapto-1,2,4-triazol-3-yl) alkanes with transition metal ions and their thermokinetic and biological studies

et al. 2008

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“…iii) The value of ∆G increases for complexes because while going from one decomposition step to another; the rate of H 2 L removal will be lower [40,41]. This can be due to, the rigidity of remaining complex after the explosion of one or more H 2 L molecules.…”

Section: Thermogravimetric Studiesmentioning

confidence: 98%

2-(2-(2-Hydroxybenzyliden) Hydrazinyl)-2-Oxo-N-(Pyridine-2-Yl) Acetamide Complexes: Synthesis, Characterization and Biological Studies

El-Reash¹,

Zaky²,

Yaseen³

2016

Chem Sci J

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Citation: El-Reash YGA, Zaky R, Yaseen MA (2016) 2-(2-(2-Hydroxybenzyliden) Hydrazinyl)-2-Oxo-N-(Pyridine-2-Yl) Acetamide Complexes: Synthesis, Characterization and Biological Studies. Chem Sci J 7: 145. doi: 10.4172/2150-3494.1000145 Copyright: © 2016 El-Reash YGA, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Keywords: Hydrazones; DFT; DND; Potentiometry IntroductionHydrazones are versatile ligands and possessing an azomethine -NHN=CH-proton groups. They can be described by the following general structure R 2 C = NNR 2 . Hydrazone ligands and their metal complexes were attracted many authors because of their varied applications in biological, pharmaceutical, analytical, catalytic [1][2][3][4][5] and industrial fields. Hydrazones and their coordination compounds play important roles in treatment of different diseases. Hydrazones considered as an significant class of compounds with wide importance due to their various biological applications such as anticonvulsant, analgesic, antidepressant, antimalarial, antiplatelet, antimycobacterial, antimicrobial, antiviral, anticancer, antidiabetic, vasodilator, anthelmintic,. This work targets the synthesize and characterization Co(II) and Ni(II) complexes of 2-(2-(2-hydroxybenzyliden) hydrazinyl)-2-oxo-N-(pyridine-2-yl) acetamid (H 2 L). The geometry and modes of chelation of complexes were discussed based on the resulted (DFT) quantum calculations, the magnetic moment, the different spectroscopic methods ( 1 H and 13 C-NMR, UV-visible, IR, EI-mass). Moreover, the thermal decomposition steps were studied and both the kinetics and thermodynamic factors were determined using Coats-Redfern and Horowitz-Metzger models. In addition, potentiometric titrations were done in 50% DMSO-water mixture at various temperatures (298, 308 and 318 K) respectively. Moreover, their Minimum inhibitory concentration (MIC) and DNA-binding affinity assay were tested. (C, H and N) percent presented in the prepared ligand (H 2 L) and complexes were detected using a Perkin-Elmer 2400 series II analyzer, while chloride and metal contents determined using standard methods reported previously [15]. A thermogravimetric analyzer (TGA-50H) from Shimadzu, Japan, used for both thermogravimetric (TGA) and differential thermal analysis (DTA) measurements with a heating rate of 10°C/min on at temperature range (20-800°C) and nitrogen flow rate of 15 ml/min. A Sherwood Magnetic Balance was utilized to measure the magnetic susceptibility of solid complexes. A Mattson 5000 FTIR spectrophotometer was used to analyze the prepared ligand and complexes under range of (4000-400 cm -1 ) in KBr discs. While; the electronic spectra of complexes (in DMSO solution) was recorded using a Perkin Elmer Lamda 25 UV/Vis Spectrophotometer. 1 H, 13 C-NMR measurements were done on Mercury and Gemini 400 MHZ spectrome...

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“…The positive values of entropy change of some complexes, may suggest that the disorder of the decomposed fragments increases much more rapidly than that of the undecomposed one. [32].…”

Section: Kinetic Datamentioning

confidence: 99%

Mononuclear Cr(III), Mn (II), and Fe(III) complexes derived from new ONO symmetrical flexible hydrazone: synthesis, spectral characterization, optical band gap and DFT computational study

2019

Lett Appl NanoBioSci

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New mononuclear Mn (II), Cr (III) and Fe (III) complexes of flexible symmetrical 2-(2-(2-hydroxy-3-methoxybenzylidene) hydrazinyl)-2-oxo-N-(pyridine-2-yl) acetamid (H 4 MPA) were isolated and characterized. IR spectra proved that the hydrazone coordinates as ONO dibasic or monobasic in keto and enol forms. The density functional theory (DFT) based quantum chemical calculations were accomplished at B3LYP/6-level of theory. Muilikan atomic charge in a companion with global and local reactivities and various energitic values have been calculated at the selected atoms, and the reactive sites have been assigned on the surface of the molecules through molecular electrostatic potential (MEP) map. The stability of all compounds was examined by TGA and DrTGA and the associated kinetic parameters were determined. Also, the optical band gap values were evaluated and found to be comparable with those obtained by DFT suggesting the possibility of using the title compounds in solar cells.

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Thermal and spectral studies of 3-N-methyl-morpholino-4-amino-5-mercapto-1,2,4-triazole and 3-N-methyl-piperidino-4-amino-5-mercapto-1,2,4-triazole complexes of cobalt(II), nickel(II) and copper(II)

Cited by 143 publications

References 9 publications

Biheterocyclic ligands: synthesis, characterization and coordinating properties of bis(4-amino-5-mercapto-1,2,4-triazol-3-yl) alkanes with transition metal ions and their thermokinetic and biological studies

Biheterocyclic ligands: synthesis, characterization and coordinating properties of bis(4-amino-5-mercapto-1,2,4-triazol-3-yl) alkanes with transition metal ions and their thermokinetic and biological studies

2-(2-(2-Hydroxybenzyliden) Hydrazinyl)-2-Oxo-N-(Pyridine-2-Yl) Acetamide Complexes: Synthesis, Characterization and Biological Studies

Mononuclear Cr(III), Mn (II), and Fe(III) complexes derived from new ONO symmetrical flexible hydrazone: synthesis, spectral characterization, optical band gap and DFT computational study

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