scholarly journals Synthesis of Imine-Naphthol Tripodal Ligand and Study of Its Coordination Behaviour towards Fe(III), Al(III), and Cr(III) Metal Ions

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Kirandeep Kaur ◽  
Minati Baral
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Metal Complexes ◽  
Formation Constants ◽  
Semiempirical Methods ◽  
Spectroscopic Techniques ◽  
Tripodal Ligand ◽  
Spectrophotometric Methods ◽  
Solution Studies ◽  
Coordination Behaviour

A hexadentate Schiff base tripodal ligand is synthesized by the condensation of tris (2-aminoethyl) amine with 2-hydroxy-1-naphthaldehyde and characterized by various spectroscopic techniques like UV-VIS, IR, NMR, MASS, and elemental analysis. The solution studies by potentiometric and spectrophotometric methods are done at 25 ± 1°C,µ=0.1 M KCl, to calculate the protonation constants of the ligand and formation constants of metal complexes formed by the ligand with Fe(III), Al(III), and Cr(III) metal ions. The affinity of the ligand towards Fe(III) is compared with deferiprone (a drug applied for iron intoxication) and transferrin (the main Fe(III) binding protein in plasma). Structural analysis of the ligand and the metal complexes was done using semiempirical PM6 method. Electronic and IR spectra are calculated by semiempirical methods and compared with experimental one.

scholarly journals Synthesis and Spectral Analysis of Some Metal Ions Complexes with Mixed Ligands of Schiff Base and 1, 10-Phenanthroline

2017 ◽  
Vol 14 (1) ◽  
pp. 135-147
Author(s):  
Baghdad Science Journal
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Metal Complexes ◽  
Mass Spectrometer ◽  
Schiff Base Ligand ◽  
Metal Ion ◽  
Molecular Structures ◽  
Spectroscopic Techniques ◽  
Metal Ion Complexes ◽  
Free Schiff Base

The free Schiff base ligand (HL1) is prepared by being mixed with the co-ligand 1, 10-phenanthroline (L2). The product then is reacted with metal ions: (Cr+3, Fe+3, Co+2, Ni+2, Cu+2 and Cd+2) to get new metal ion complexes. The ligand is prepared and its metal ion complexes are characterized by physic-chemical spectroscopic techniques such as: FT-IR, UV-Vis, spectra, mass spectrometer, molar conductivity, magnetic moment, metal content, chloride content and microanalysis (C.H.N) techniques. The results show the formation of the free Schiff base ligand (HL1). The fragments of the prepared free Schiff base ligand are identified by the mass spectrometer technique. All the analysis of ligand and its metal complexes are in good agreement with the theoretical values indicating the purity of Schiff base ligand and the metal complexes. From the above data, the molecular structures for all the metal complexes are proposed to be octahedral

scholarly journals A Novel Tris(2-aminoethyl)amine Based Tripodal Ligand: Synthesis and Solution Coordination Studies with Trivalent Iron and Chromium

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Minati Baral ◽  
Amit Gupta ◽  
Rifat Akbar ◽  
Bikram K. Kanungo
Keyword(s):  
Metal Ions ◽  
Formation Constants ◽  
Distorted Octahedral Geometry ◽  
Trivalent Metal ◽  
Tripodal Ligand ◽  
Complex Species ◽  
Distorted Octahedral ◽  
Coordination Behaviour ◽  
Trivalent Metal Ions ◽  
Ph Range

A novel tris(2-aminoethyl)amine (TREN) based tripodal ligand TRENOL (L) has been synthesized and characterized by elemental analysis and UV-VIS, IR, 1H, and 13C NMR spectroscopic methods. The coordination behaviour of the ligand with H+ and trivalent metal ions, Fe(III) and Cr(III), was investigated in aqueous medium at 0.1 M KCl at 25±1°C by potentiometric and spectrophotometric studies. Tripodal ligand showed seven protonation constants in the adopted pH range 2–11 and its electronic spectra exhibited three bands at 216, 323, and 423 nm. Ligand formed various metal complex species of the type MLH5, MLH4, MLH3, MLH, and ML with trivalent metal ions. The determined values of the formation constants (for ML species) of the ligand with Fe(III) and Cr(III) were 24.19 and 18.64, respectively. Molecular modeling studies revealed that the metal complexes formed distorted octahedral geometry. Besides, ligand showed fluorescence at 496 nm when excited at 289 nm. The fluorescence behaviour of the ligand in the presence of Fe(III) ions showed noticeable quenching in comparison to the other metal ions at physiological pH (7.4). So, as per the outcomes of the present study, TRENOL has the potential to be used as the iron detector in environmental, agricultural, and medical fields.

scholarly journals Metal complexes of triazine - Schiff bases: Spectroscopic and thermodynamic studies of complexation of some divalent metal ions with 3-(α-acetylethylidenehydrazino)-5,6-diphenyl-1,2,4-triazine

1999 ◽  
Vol 64 (10) ◽  
pp. 621-635 ◽  
Author(s):  
M. Mashaly ◽  
H.A. Bayoumi ◽  
A. Taha
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Metal Complexes ◽  
Water Solution ◽  
Formation Constants ◽  
Divalent Metal ◽  
Divalent Metal Ions ◽  
Different Temperatures ◽  
Metal Ligand ◽  
Cu And Zn

Metal complexes of some divalent metal ions (Co, Ni, Cu and Zn) with 3-(?- acetylethylidenehydrazino)-5,6-diphenyl-1,2,4-triazine (AHDT) as a Schiff-base have been investigated potentiometrically and spectrophotometrically and found to have the stoichiometric formulae 1:1 and 1:2 (M:L). The formation constants of the proton-ligand and metal-ligand complexes have been determined potentiometrically at different temperatures (10, 20, 30, 40 and 50?C) at an ionic strength of 0.1MKNO3 in 75%(v/v) dioxane-water solution. The standard thermodynamic parameters, viz. ?Go, ?Ho, and ?So, for the proton-ligand and the stepwise metal-ligand complexes have been evaluated.

Spectroscopic and thermodynamic studies of complexation of some divalent metal ions with isatin-β-thiosemicarbazone

2007 ◽  
Vol 61 (6) ◽  
Author(s):  
S. Konstantinović ◽  
B. Radovanović ◽  
Z. Todorović ◽  
S. Ilić ◽  
B. Konstantinović
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Metal Complexes ◽  
Dissociation Constants ◽  
Water Solution ◽  
Molecular Complexes ◽  
Formation Constants ◽  
Divalent Metal ◽  
Divalent Metal Ions ◽  
Different Temperatures

AbstractMetal complexes of some divalent metal ions (Co, Ni, Cu, Zn, Hg, and Pd) with isatin-β-thiosemicarbazone (ITS) as the Schiff base have been investigated potentiometrically and spectrophotometrically. The dissociation constants of the ligand and formation constants of the metal complexes, as well as the corresponding thermodynamic functions (ΔG, ΔH and ΔS) have been determined at different temperatures in ethanol—water solution. The full stability constants were also evaluated spectrophotometrically by the Job method. The experimental results indicate that Cu(II), Zn(II), Pd(II), and Hg(II) form one-to-one molecular complexes (ML) with the studied ligand, whereas Co(II) and Ni(II) form both ML and ML2 species.

Synthesis, Characterization and in vitro Biological Evaluation of a New Schiff Base Derived from Drug and its Complexes with Transition Metal Ions

2018 ◽  
Vol 69 (7) ◽  
pp. 1678-1681
Author(s):  
Amina Mumtaz ◽  
Tariq Mahmud ◽  
M. R. J. Elsegood ◽  
G. W. Weaver
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Ions ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Free Ligand ◽  
Transition Metal Ions ◽  
Biological Evaluation ◽  
Pyridoxal Hydrochloride

New series of copper (II), cobalt (II), zinc (II), nickel (II), manganese (II), iron (II) complexes of a novel Schiff base were prepared by the condensation of sulphadizine and pyridoxal hydrochloride. The ligand and metal complexes were characterized by utilizing different instrumental procedures like microanalysis, thermogravimetric examination and spectroscopy. The integrated ligand and transition metal complexes were screened against various bacteria and fungus. The studies demonstrated the enhanced activity of metal complexes against reported microbes when compared with free ligand.

scholarly journals The proton and metal complexes of adenyl-5′-yl imidodiphosphate

1976 ◽  
Vol 159 (1) ◽  
pp. 169-171 ◽  
Author(s):  
L D Pettit ◽  
K F Siddiqui
Keyword(s):  
Complex Formation ◽  
Transition Metal ◽  
Metal Ions ◽  
Metal Complexes ◽  
Transition Metal Ions ◽  
Formation Constants ◽  
Enthalpy Change ◽  
Two Temperatures ◽  
Bivalent Transition Metal

The formation constants of the complexes of adenyl-5′-yl imidodiphosphate with H+ Mg2+, Ca2+ and a number of bivalent transition-metal ions were measured potentionmetrically. The complexes are generally a little more stable than the analogous complexes of ATP. By measuring the formation constants at two temperatures, this increase in stability was shown to result from an increased enthalpy change on complex-formation.

scholarly journals Synthesis, Characterization of Metal Complexes of Schiff Base derived from Pyrrole-2-carbaldehyde and 4-Methoxy Aniline and their Biological Studies

2020 ◽  
Vol 32 (12) ◽  
pp. 3012-3018
Author(s):  
A. Charles ◽  
R. Krishnaveni ◽  
K. Sivara
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Dna Cleavage ◽  
Thermal Studies ◽  
Salmonella Typhi ◽  
Spectroscopic Techniques ◽  
Dna Cleavage Activity ◽  
Biological Studies ◽  
Staphylococcus Epidermis ◽  
Coordinated Water

The metal complexes of Fe(II), Co(II) and Ni(II) have been synthesized from N-((1H-pyrrol-2- yl)methylene)-4-methoxyaniline. The synthesized Schiff base and its metal complexes were structurally characterized based on IR, NMR, UV-vis spectroscopic techniques. The presence of coordinated water molecules were confirmed by thermal studies. All the synthesized compounds were screened for their antibacterial (Escherichia coli, Bacillus substilis, Salmonella typhi, Staphylococcus epidermis) and antifungal (Aspergillus flavus) and DNA cleavage activity.

scholarly journals Studies on Coordination Chemistry and Antibacterial Activity of Bidentate NS Schiff Base Derived From SBDTC and 4-Benzyloxybenzaldehyde

2019 ◽  
Vol 11 (1) ◽  
pp. 121-132 ◽  
Author(s):  
M. H. Islam ◽  
M. C. Sheikh ◽  
M. A. A. A A. Islam
Keyword(s):  
Antibacterial Activity ◽  
Schiff Base ◽  
Metal Ions ◽  
Free Ligand ◽  
Molar Conductance ◽  
Absolute Ethanol ◽  
Moderate Activity ◽  
Spectroscopic Techniques ◽  
Biological Potential ◽  
Test Organisms

The condensation of 4-benzyloxybenzaldehyde with S-benzyl dithiocarbazate (SBDTC) in absolute ethanol afforded the Schiff base, S-benzyl-β-N-(4-benzyloxyphenyl)methylene-dithiocarbazate (1). The ligand on further reaction with metal ions in absolute ethanol [for Ni(II), Cu(II), Zn(II)] and in methanol [Pd(II)] resulted in the formation of the corresponding four coordinate complexes. The ligand and its complexes were characterized by physico-chemical techniques, viz., molar conductance, magnetic susceptibility measurement, IR, NMR and solution UV/Vis spectroscopic techniques. The complexes demonstrated stronger antibacterial activity than the free ligand indicating that coordination with these metal ions has enhanced biological potential of the ligand. All the compounds exhibited more or less moderate activity against the test organisms.

scholarly journals Synthesis, Characterization and Spectroscopic Studies of A Novel 2-[(E)-[(2,4-dichlorophenyl)imino]methyl]phenol Schiff Base and Its Metal Complexes

2012 ◽  
Vol 9 (3) ◽  
pp. 1543-1549
Author(s):  
Eman Turky Shamkhy ◽  
Isam Hussain T. Al-Karkhi
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Metal Ion ◽  
Glacial Acetic Acid ◽  
Condensation Reaction ◽  
Spectroscopic Studies ◽  
Chloride Salt ◽  
Complexation Reaction ◽  
Spectroscopic Techniques ◽  
Physico Chemical

A novel Schiff base 2-{(E)-[(2,4-dichlorophenyl)imino]methyl}phenol (LB) was synthesized from the condensation reaction of 2,4-dichloroaniline with salicyladehyde in [1:1] ratio in the presence of glacial acetic acid as catalyst. Complexation reaction of this Schiff base with copper (II), cobalt (II) as nitrate salts and with Rhodium (III) as chloride salt to produce three coordinate metal complexes, with a Schiff base: Metal ion ratio of 2:1. These compounds have been characterized by a variety of physico-chemical and spectroscopic techniques. The ligand and its metal complexes were expected to show an interesting bioactivity and cytotoxicity.

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