scholarly journals Synthesis and Characterization of Lanthanide(III) Nitrate Complexes with Terdentate ONO Donor Hydrazone Derived from 2-Benzimidazolyl Mercaptoaceto Hydrazide and o-Hydroxy Aromatic Aldehyde

2011 ◽  
Vol 8 (4) ◽  
pp. 1900-1910 ◽  
Author(s):  
Vinayak M. Naik ◽  
Nirmalkumar B. Mallur
Keyword(s):  
Metal Ion ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Hydrazone Ligand ◽  
Keto Form ◽  
Thermal Stabilities ◽  
H Nmr ◽  
Uv Visible ◽  
Nitrate Complexes

A few eight coordinated complexes of lanthanide(III) nitrate with 2-benzimidazolyl mercaptoaceto hydrazone ligand (LH2) with the general formula [Ln(LH)2NO2]H2O (where Ln = La, Pr, Nd, Sm and Gd) have been synthesized and characterized by elemental analysis, magnetic susceptibility, molar conductance, UV-Visible, IR and1H NMR spectral studies. The experimental data sustain stoichiometry of 1:2 (metal/ligand) for the complexes. The spectral data shows that the ligand reacts in keto form and behaves as monobasic terdentate in nature. The nitrate appears to coordinate in the bidentate fashion to the metal ion. The thermal stabilities of the complexes have been studied by TGA and their kinetic parameters were calculated using Coats-Redfern and MKN methods. The antimicrobial activity studies have been under taken and results are discussed.

scholarly journals Synthesis and spectroscopic characterization of some lanthanide(III) nitrate complexes of 3-[3-carboxyethyl-4,5- dimethylthiophene-2-yl)azo]pent-2,4-dione

2011 ◽  
Vol 76 (2) ◽  
pp. 249-261 ◽  
Author(s):  
Janardhanan Athira ◽  
Yesodharan Sindhu ◽  
Susamma Sujamol ◽  
Kochukittan Mohanan
Keyword(s):  
Elemental Analysis ◽  
Metal Ion ◽  
Spectroscopic Characterization ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Structural Form ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nitrate Complexes

3-[3-Carboxyethyl-4,5-dimethylthiophene-2-yl)azo]pent-2,4-dione was synthesized by coupling diazotized 2-amino-3-carboxyethyl- 4,5-dimethylthiophene with acetylacetone. Based on various spectral studies and elemental analysis, an intramolecularly hydrogen bonded azoenol structural form was assigned for the ligand. This ligand is versatile in forming a series of lanthanide(III) complexes viz, lanthanum(III), cerium(III), praseodymium(III), neodymium(III), samarium(III) and gadolinium(III), which were characterized through various spectral studies, elemental analysis, magnetic susceptibility measurements, molar conductance and thermal analysis. The spectral data revealed that the ligand acted as a neutral tridentate, coordinating to the metal ion through one of the azo nitrogen atoms, the ester carbonyl and the enolic oxygen of the acetylacetone moiety, without deprotonation. Molar conductance values adequately supported their non-electrolytic nature. The ligand and lanthanum(III) complexes were subjected to X-ray diffraction studies. In addition, the lanthanum(III) complex underwent a facile transesterification reaction on refluxing with methanol for a long period. The thermal behavior of the lanthanum(III) complex was also examined.

Synthesis and Characterization of Complexes of New Derivative of Cyclopentaphenanthren-3-one with Manganese (II), Iron (II), Cobalt (II), Nickel (II), and Copper (II) Ions

2020 ◽  
Vol 38 (3B) ◽  
pp. 197-203
Author(s):  
Liblab S. Jassim
Keyword(s):  
Metal Ion ◽  
Molar Conductance ◽  
Spectral Measurements ◽  
Chemical Preparation ◽  
Electron Pairs ◽  
H Nmr ◽  
Absorption Studies ◽  
Ft Ir ◽  
Uv Visible

This work involves the chemical preparation from a series of metal Complexes having the general composition M(L)2(H2O)2, where M = [Mn+2, Fe+2, Co+2, Ni+2 and Cu+2]. The ligand used was 9-fluoro-17-(1-hydrazono-2-hydroxyethyl)-11,17-dihydroxy-10,13,16-trimethyl-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[α]phenanthren-3-one (FHDTCP), who was diagnosed by H-NMR spectra. These complexes have been prepared and characterized by the ligand to metal by molar conductance, spectral (UV-Visible and FT-IR), and atomic absorption studies. The IR spectral measurements forecast interference to oxygen, nitrogen in coordination from the electron pairs to the metal ion in the center. And suggested the complexes geometry be octahedral for all.

scholarly journals Synthesis, Characterization of La(III), Nd(III), and Er(III) Complexes with Schiff Bases Derived from Benzopyran-4-one and Thier Fluorescence Study

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
Aida L. El-Ansary ◽  
Nora S. Abdel-Kader
Keyword(s):  
Schiff Bases ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Water Molecules ◽  
Stoichiometric Ratio ◽  
Binuclear Complexes ◽  
Fluorescence Study ◽  
H Nmr ◽  
Coordinated Water

The Schiff bases, L1, L2, and L3, are synthesized from the condensation of 5,7-dihydroxy-6-formyl-2-methylbenzopyran-4-one (L) with 2-aminopyridine (1), p-phenylenediamine (2), and o-phenylenediamine (3). The prepared Schiff bases react with lanthanum (III), neodymium (III), and erbium (III) nitrate to give complexes with stoichiometric ratio (1 : 1) (ligand : metal). The binuclear complexes of Er(III) with L3 and the three metal ions with L2 are separated. The complexes have been characterized by elemental analysis, molar conductance, electronic absorption, and infrared, 1H-NMR spectral studies. The presence of hydrated and coordinated water molecules is inferred from thermogravimetric analysis. Thermal degradation studies show that the final product is the metal oxide. The luminescence properties of the Nd(III) and Er(III) complexes in dimethylformamide (DMF) solutions were investigated.

scholarly journals SYNTHESIS AND CHARACTERIZATION OF COBALT (III) COMPLEX OF SALICYLALDEHYDE BENZOYL HYDRAZONE

2017 ◽  
Vol 22 (1) ◽  
pp. 132-136
Author(s):  
Sabita Shrestha
Keyword(s):  
Metal Ion ◽  
Cobalt Complex ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Water Molecules ◽  
Conductance Measurement ◽  
Infrared Spectral ◽  
Metal Ligand ◽  
Benzoyl Hydrazone

Cobalt Complex of type [Co(Hsbh)2(NO3)(H2O)]. 3H2O was synthesized and characterized by different analytical procedures, molar conductance, infrared and electronic spectral studies. The complex was found to be 1:2 metal ligand ratio. Molar conductance measurement shows non electrolyte nature of complex. Dehydration studies indicate the presence of coordinated as well as lattice water molecules. Infrared spectral studies indicate that ligand undergo keto enol tautomerism and bond to the metal ion via enolic oxygen and NH2 group. The electronic spectrum shows octahedral geometry around central cobalt (III) atom.Journal of Institute of Science and TechnologyVolume 22, Issue 1, July 2017, page: 132-136

scholarly journals Bioactive Metal Complexes of Schiff Base Derived from 2,3-Dioxobutane, Ethane-1,2-diamine and 4-Chloro-2-formylphenol: Spectral Studies and in vitro Antimicrobial Activity

2021 ◽  
Vol 33 (12) ◽  
pp. 3063-3069
Author(s):  
Abhay Nanda Srivastva ◽  
Sayanwita Panja ◽  
Netra Pal Singh ◽  
Chandra Kiran Shriwastaw
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Magnetic Moment ◽  
Metal Ion ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Coordination Behaviour ◽  
Uv Visible ◽  
Iron Chromium

A novel series of trivalent coordination complexes was synthesized by the reaction between a chloride/ acetate salt of iron, chromium, cobalt or manganese ions and NNNNOO type persuasive Schiff base ligand synthesized from 2,3-dioxobutane, ethane-1,2-diamine and 4-chloro-2-formylphenol. Synthesized compounds were characterized by using elemental analysis, molar conductance, magnetic moment, IR, UV-visible, 1H NMR, 13C NMR and ESI-MS spectral analyses. IR and NMR spectra favoured hexadentate coordination behaviour of ligand. Electronic spectra and magnetic moment data reveal Oh geometry with distortion around the metal ion in complexes. The molar conductance values show 1:1 electrolytic nature of complexes. Biological potentiality of the ligand and its metal complexes were tested in vitro against two bacterial and two fungal strains; Bacillus subtilis, Escherichia coli and Aspirgillus niger, Aspirgillus flavus, respectively.

scholarly journals Colorimetric detection of hydrogen peroxide by dioxido-vanadium(V) complex containing hydrazone ligand: synthesis and crystal structure

2018 ◽  
Vol 5 (3) ◽  
pp. 171471 ◽  
Author(s):  
Sunshine D. Kurbah ◽  
Ibanphylla Syiemlieh ◽  
Ram A. Lal
Keyword(s):  
Metal Ion ◽  
Colorimetric Detection ◽  
Hydrazone Ligand ◽  
Synthesis And Crystal Structure ◽  
Cell Parameters ◽  
X Ray Crystallography ◽  
H Nmr ◽  
Pyramidal Geometry ◽  
Uv Visible ◽  
Square Pyramidal Geometry

Dioxido-vanadium(V) complex has been synthesized in good yield, the complex was characterized by IR, UV–visible and 1 H NMR spectroscopy. Single crystal X-ray crystallography techniques were used to assign the structure of the complex. Complex crystallized with monoclinic P 2 1 /c space group with cell parameters a (Å) = 39.516(5), b (Å) = 6.2571(11), c (Å) = 17.424(2), α (°) = 90, β (°) = 102.668(12) and γ (°) = 90. The hydrazone ligand is coordinate to metal ion in tridentate fashion through –ONO– donor atoms forming a distorted square pyramidal geometry around the metal ion.

scholarly journals Synthesis, Characterization and Antimicrobial Studies of N1-[(1E)-1-(2-Hydroxyphenyl) ethylidene]-2-oxo-2H-chromene-3-carbohydrazide and its Metal Complexes

2009 ◽  
Vol 6 (3) ◽  
pp. 615-624 ◽  
Author(s):  
K. Siddappa ◽  
K. Mallikarjun ◽  
Tukaram Reddy ◽  
M. Mallikarjun ◽  
C. V. Reddy ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Metal Complexes ◽  
Molar Conductance ◽  
Tetrahedral Geometry ◽  
H Nmr ◽  
Antimicrobial Studies ◽  
Mononuclear Complexes ◽  
Uv Visible

A new complexes of the type ML, MʹL and M″L [where M=Cu(II), Co(II), Ni(II) and Mn(II), Mʹ=Fe(III) and M″=Zn(II), Cd(II) and Hg(II) and L=N1-[(1E)-1-(2-hydroxyphenyl)ethylidene]-2-oxo-2H-chromene- 3-carbohydrazide (HL)] Schiff base have been synthesized and characterized by elemental analysis, magnetic susceptibility, molar conductance, IR,1H NMR, UV-Visible and ESR data. The studies indicate the HL acts as doubly monodentate bridge for metal ions and form mononuclear complexes. The complexes Ni(II), Co(II), Cu(II) Mn(II) and Fe(III) complexes are found to be octahedral, where as Zn(II), Cd(II) and Hg(II) complexes are four coordinated with tetrahedral geometry. The synthesized ligand and its metal complexes were screened for their antimicrobial activity.

scholarly journals Preparation, Characterization, and Thermal Degradation Studies ofp-Nitrophenol-Based Copolymer

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Pawan P. Kalbende ◽  
Mangesh V. Tarase ◽  
Anil B. Zade
Keyword(s):  
Thermal Degradation ◽  
Thermal Activation ◽  
Frequency Factor ◽  
Spectral Studies ◽  
H Nmr ◽  
Degradation Pattern ◽  
Degradation Step ◽  
Ft Ir ◽  
Uv Visible ◽  
Most Probable Structure

Polycondensation reaction was employed to synthesize a new copolymer resin (p-NP-4,4′-MDA-F) from p-nitrophenol (p-NP) and 4,4′-methylene dianiline (4,4′-MDA) with formaldehyde (F) in presence of 2 M hydrochloric acid as a catalyst at130±1°C. The resin was characterized by elemental analysis and spectral studies such as UV-visible, FT-IR, and1H-NMR spectra which were used to confine the most probable structure of synthesized copolymer. Thermal degradation pattern and kinetics have been investigated by thermogravimetric analysis. Thermal degradation curve have been studied with minute detail for each degradation step. Friedman, Chang, Sharp-Wentworth, Freeman-Carroll, and Coat-Redfern methods have been implemented in order to compute the kinetic parameters, that is, thermal activation energy (Ea), order of reaction (n), and frequency factor (z).

scholarly journals THE METAL COMPLEXES OF NOVEL SCHIFF BASE CONTAINING ISATIN: CHARACTERIZATION, ANTIMICROBIAL, ANTIOXIDANT AND CATALYTIC ACTIVITY STUDY

2019 ◽  
pp. 206-210
Author(s):  
VAIRALAKSHMI M ◽  
PRINCESS R ◽  
JOHNSON RAJA S
Keyword(s):  
Catalytic Activity ◽  
Metal Complexes ◽  
1H Nmr ◽  
Metal Ion ◽  
Analytical Data ◽  
Free Ligand ◽  
Molar Conductance ◽  
Diffusion Method ◽  
Spectral Studies ◽  
Standard Drug

Objectives: The aim of our work was to synthesize novel mixed ligand-metal complexes and evaluation of antimicrobial, antioxidant assay, and analysis of catalytic oxidation of cyclohexane. Methods: The complexes were characterized by means of various physicochemical techniques such as elemental analysis, molar conductance, magnetic susceptibility, infrared (IR), electronic absorption, 1H NMR (proton magnetic resonance), and mass spectral studies. The antimicrobial screening study was done by disc diffusion method. The catalytic activity of the complexes was observed in the oxidation of cyclohexane using eco-friendly hydrogen peroxide as oxidant. Results: On comparing the 1H NMR and IR spectral data of free ligand and its complexes, it was found to be azomethine (CH=N) proton which is formed in the free ligand. During complexation, the azomethine proton is coordinated to the metal ion and the phenolic oxygen is coordinated to the metal ion by deprotonation. The analytical data and mass spectra of the ligand and the complexes confirm the stoichiometry of metal complexes as being of the (MLY)Cl type and the metal to ligand ratio is 1:1. The antimicrobial, antioxidant, and catalytic potential were evaluated and the result shows the better activity of the complexes than the ligand. Conclusion: It was found to be copper(II) and zinc(II) complexes which are effective against all the bacteria when compared to standard drug streptomycin. Copper(II) complex was found to be effective antibacterial agent against Aspergillus niger and Aspergillus flavus in comparison to the standard drug Nystatin. The zinc complex exhibited good catalytic activity.

Synthesis and spectral properties of ruthenium(II) complexes with tetra-15-crown-5-phthalocyanine and N-donor ligands

2003 ◽  
Vol 07 (12) ◽  
pp. 795-800 ◽  
Author(s):  
Yuliya G. Gorbunova ◽  
Yuliya Yu. Enakieva ◽  
Sergey G. Sakharov ◽  
Aslan Yu. Tsivadze
Keyword(s):  
Spectral Properties ◽  
Donor Ligands ◽  
Preparation Technique ◽  
Reaction Products ◽  
H Nmr ◽  
Trimethylamine Oxide ◽  
Donor Solvent ◽  
Ft Ir ◽  
Uv Visible

The synthesis of novel bis-axially coordinated ruthenium(II) complexes with tetra-15-crown-5-phthalocyanine and N-donor ligands ( R 4 Pc ) Ru ( L 2) ( R 4Pc2- = 4,5,4',5',4'',5'', 4''',5'''- tetrakis(1,4,7,10,13-pentaoxotridecamethylene)phthalocyaninate-ion, L = pyridine (py), isoquino-line (iqnl), triethylamine ( Et 3 N )) is reported. The preparation technique involves the interaction of ( R 4 Pc ) Ru ( CO )( CH 3 OH ) with trimethylamine oxide in an N-donor solvent. The advantage of this method consists in selective carbonyl ejection from ( R 4 Pc ) Ru ( CO ) X with simultaneous substi-tution by N-donor ligands. The application of this procedure allowed us to decrease essentially the reaction time, as compared with photochemical methods, as well as to increase substantially the yield of reaction products. UV-visible, 1 H NMR, FT-IR and mass-spectrometry were used for characterization of the obtained compounds.

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