Magnetic and Spectroscopic Studies of the Synthesized Metal Complexes of Bis(Pyridine‐2‐carbo) Hydrazide and Their Antimicrobial Studies

Singh, Netra Pal; ., Anu .; Singh, Jagvir

doi:10.1155/2012/521345

Cited by 9 publications

(6 citation statements)

References 19 publications

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“…(II) The value of the nephelauxetic ratio β is evaluated as the ratio of the term separation in the complex. The electronic spectrum coupled with magnetic 4.78BM supports the suggested geometry of this complex [22].…”

Section: Electronic Spectra and Magnetic Momentsupporting

confidence: 65%

Synthesis, Spectral Study and Theoretical Treatment of Some Mixing Ligand Complexes of Quinaldic Acid and 1, 10-Phenathroline

Journal¹

2016

Baghdad Sci.J

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Metal complexes of Cu (II), Fe (III) and Mn (II) with Quinaldic acid (L1) and 1, 10-Phenathroline (L2) are synthesized and characterized by standaral physic- chemical procedures (element analysis, metal analysis, FTIR, Uv-Vis, magnetic moment and conductometeric measurements). On the base of these studies, mononuclear and six coordinated octahedral geometry and nonelectrolyte of these complexes have been proposed. The standard heat of formation (?Hºf) and binding energy (?Eb) for the free ligands and their complexes are calculated by using the PM3 method at 273K of Hyperchem.-8 program. The complexes are more stable than their ligands. Moreover, the electrostatic potential of free ligands are measured to investigate the reactive site of the molecules, PM3 is used to evaluate the vibrational spectra of the free ligands, the frequencies are obtained approximately agreed with those values experimentally found; in addition, the calculation helps to assign clearly the most diagnostic bands .

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Section: Electronic Spectra and Magnetic Momentsupporting

confidence: 65%

Synthesis, Spectral Study and Theoretical Treatment of Some Mixing Ligand Complexes of Quinaldic Acid and 1, 10-Phenathroline

Journal¹

2016

Baghdad Sci.J

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“…This provides evidence for coordination through the carbonyl oxygen. In addition, the broadened bandwidth at around 1695 cm –1 in the complexes may be considered as further evidence for metal chelation . The heterocyclic ring nitrogen was suggested to undergo bond formation with the metal, thus increasing the dipolar contribution of CN + .…”

Section: Resultsmentioning

confidence: 96%

“…In addition, the broadened bandwidth at around 1695 cm −1 in the complexes may be considered as further evidence for metal chelation. 23 The heterocyclic ring nitrogen was suggested to undergo bond formation with the metal, thus increasing the dipolar contribution of CN + . 21 Bands at 1632 or 1619 cm −1 may be assigned as ring nitrogen vibration.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Stabilization of the Potent Odorant 2-Acetyl-1-pyrroline and Structural Analogues by Complexation with Zinc Halides

Fang

Cadwallader

2014

J. Agric. Food Chem.

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2-Acetyl-1-pyrroline (2AP) and the structurally similar compounds 6-acetyl-2,3,4,5-tetrahydropyridine (ATHP, along with its tautomer 6-acetyl-1,2,3,4-tetrahydropyridine), 2-propionyl-1-pyrroline (2PP), and 2-acetyl-2-thiazoline (2A2T) are well-known potent odorants in various food products. However, due to the highly unstable nature of these compounds, especially 2AP and ATHP, they are scarcely used commercially in flavor formulations. A novel and attractive method for the stabilization of these potent odorants in dry powder form is presented. Coordination of 2AP, ATHP, 2PP, and 2A2T to zinc ions (ZnI2, ZnBr2, or ZnCl2) resulted in the formation in high yields of stable crystalline complexes, which upon hydration release the free odorant. Infrared spectroscopy was used to study the coordination complexes. 2AP contains donor atoms, which coordinate (with covalent character) through both the heterocyclic nitrogen and carbonyl oxygen atoms to the zinc ion. This is also the case for ATHP and 2PP, but not for 2A2T, because the sulfur group in 2A2T provides a third possible donor site. Stability studies showed that the 2AP-ZnI2 complex (with 14% loading) maintained >94% retention of 2AP after 3 months of storage at ambient temperature in a dry environment. Meanwhile, the ATHP-ZnI2 complex was similarly stable and retained 89% of the ATHP after 3 months of storage. This stabilization technology may enable the commercial use of this powerful aroma compound as a flavoring agent.

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“…The observed magnetic moment of the copper complexes is 1.75–180 BM. The Ni(II) complex is found to have a room temperature magnetic moment value of 3.87 B.M., which is in the normal range observed for octahedral Ni(II) complexes [26, 34, 36]. The electronic spectrum displays three bands in the solid reflectance spectrum at m 1 : 14968 cm −1 ; 3 A 2g → 3 T 2g ; m 2 : 17,788 cm −1 ; 3 A 2g → 3 T 1 g (F) and m 3 ; 21347 cm −1 ; 3 A 2g → 3 T 1g (P).…”

Section: Resultsmentioning

confidence: 99%

“…Antimicrobial activity of the tested samples was determined using a modified Kirby-Bauer disc diffusion method [ 25 ]. One hundred microliters of the tested bacteria or fungi were grown in 10 mL of fresh media until they reached account of approximately 98 cells/mL for bacteria and 95 cells/mL for fungi [ 26 ]. One hundred microliters of microbial suspension was spread onto agar plates corresponding to the broth in which they were maintained.…”

Section: Methodsmentioning

confidence: 99%

Synthesis, Spectroscopic Characterization, and In Vitro Antimicrobial Studies of Pyridine-2-Carboxylic Acid N′-(4-Chloro-Benzoyl)-Hydrazide and Its Co(II), Ni(II), and Cu(II) Complexes

Singh

2012

Bioinorganic Chemistry and Applications

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N-substituted pyridine hydrazide (pyridine-2-carbonyl chloride and 4-chloro-benzoic acid hydrazide) undergoes hydrazide formation of the iminic carbon nitrogen double bond through its reaction with cobalt(II), nickel(II), and copper(II) metal salts in ethanol which are reported and characterized based on elemental analyses, IR, solid reflectance, magnetic moment, molar conductance, and thermal analysis (TG). From the elemental analyses data, 1 : 2 metal complexes are formed having the general formulae [MCl2(HL)2] ·yH2O (where M = Co(II), Ni(II), and Cu(II), y = 1–3). The important infrared (IR) spectral bands corresponding to the active groups in the ligand and the solid complexes under investigation were studied. IR spectra show that ligand is coordinated to the metal ions in a neutral bidentate manner with ON donor sites. The solid complexes have been synthesized and studied by thermogravimetric analysis. All the metal chelates are found to be nonelectrolytes. From the magnetic and solid reflectance spectra, the complexes (cobalt(II), nickel(II), and copper(II)) have octahedral and square planner geometry, respectively. The antibacterial and antifungal activity's data show that the metal complexes have a promising biological activity comparable with the parent ligand against bacterial and fungal species.

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Magnetic and Spectroscopic Studies of the Synthesized Metal Complexes of Bis(Pyridine‐2‐carbo) Hydrazide and Their Antimicrobial Studies

Cited by 9 publications

References 19 publications

Synthesis, Spectral Study and Theoretical Treatment of Some Mixing Ligand Complexes of Quinaldic Acid and 1, 10-Phenathroline

Synthesis, Spectral Study and Theoretical Treatment of Some Mixing Ligand Complexes of Quinaldic Acid and 1, 10-Phenathroline

Stabilization of the Potent Odorant 2-Acetyl-1-pyrroline and Structural Analogues by Complexation with Zinc Halides

Synthesis, Spectroscopic Characterization, and In Vitro Antimicrobial Studies of Pyridine-2-Carboxylic Acid N′-(4-Chloro-Benzoyl)-Hydrazide and Its Co(II), Ni(II), and Cu(II) Complexes

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