scholarly journals Coordination Polymer: Synthesis, Spectral Characterization and Thermal Behaviour of Starch-Urea Based Biodegradable Polymer and Its Polymer Metal Complexes

2010 ◽  
Vol 2010 ◽  
pp. 1-8 ◽  
Author(s):  
Ashraf Malik ◽  
Shadma Parveen ◽  
Tansir Ahamad ◽  
Saad M. Alshehri ◽  
Prabal Kumar Singh ◽  
...  
Keyword(s):  
Thermogravimetric Analysis ◽  
Coordination Polymer ◽  
Metal Complexes ◽  
Magnetic Moment ◽  
Tetrahedral Geometry ◽  
Square Planar ◽  
Visible Spectra ◽  
Polymeric Compounds ◽  
Polymer Metal ◽  
Ft Ir

A starch-urea-based biodegradable coordination polymer modified by transition metal Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) was prepared by polycondensation of starch and urea. All the synthesized polymeric compounds were characterized by Fourier transform-infrared spectroscopy (FT-IR),H-NMRspectroscopy,C-NMRspectroscopy, UV-visible spectra, magnetic moment measurements, differential scanning calorimeter (DSC), and thermogravimetric analysis (TGA). The results of electronic spectra and magnetic moment measurements indicate that Mn(II), Co(II), and Ni(II) complexes show octahedral geometry, while Cu(II) and Zn(II) complexes show square planar and tetrahedral geometry, respectively. The thermogravimetric analysis revealed that all the polymeric metal complexes are more thermally stable than the parental ligand. In addition, biodegradable studies of all the polymeric compounds were also carried out through ASTM standards of biodegradable polymers byCO2evolution method.

scholarly journals Synthesis and Antibacterial Studies of Novel Phosphorus Ligand 5-(2-diphenylphosphino) phenyl-1,2-dihydro-1,2,4-triazole-3-thione and its Metal Complexes with some Transition Metals

2010 ◽  
Vol 4 (2) ◽  
pp. 37-45
Author(s):  
Matheel D. Al-Sabti ◽  
Ahmed A. H. Al-Amiery ◽  
Thorria R. Marzoog ◽  
Yasmien K. Al-Majedy
Keyword(s):  
Metal Complexes ◽  
Free Ligand ◽  
Antimicrobial Properties ◽  
Cadmium Complex ◽  
Gram Positive Bacteria ◽  
Visible Spectra ◽  
Number Of Microorganisms ◽  
Ft Ir ◽  
The Stability

This study involves the chemical synthesis of the novel ligand 5-(2-diphenylphosphino) phenyl-1,2-dihydro-1,2,4-triazole-3-thione (DPDTT) by the reaction of 2-diphenylphosphino benzoic acid with absolute ethanol that yield ethyl 2-diphenylphosphino benzoate and by cyclization of this compound with thiosemicarbazide, DPDTT will be produced. The chelating complexes of this ligand with Cr(III), Co(II), Ni(II), Cu(II) and Cd(II) were also prepared and studied. The new complexes were characterized by FT-IR, UV/visible spectra, and room temperature magnetic susceptibility. The stability for the prepared complexes was also measured using the density function theory and it was found that the cadmium complex is the most stable and the chromium complex is the least stable. Free ligand and its metal complexes have been tested in vitro against a number of microorganisms, like gram positive bacteria Staphylococcus aureus and gram negative bacteria E. coli, Proteus vulgaris, Pseudomonas and Klebsiella in order to assess their antimicrobial properties. All complexes showed considerable activity against all the studied bacteria.

A Density Functional Theory Study of 3,5-dichlorosalicyliden-p-iminoacetophenone oxime Complexes with Co, Ni, Cu and Zn Metals

2019 ◽  
Vol 41 (5) ◽  
pp. 770-770
Author(s):  
Ali apan Ali apan ◽  
Erdal Canpolat Erdal Canpolat ◽  
Henar Sleman and Niyazi Bulut Henar Sleman and Niyazi Bulut
Keyword(s):  
Metal Complexes ◽  
Density Functional ◽  
Azomethine Nitrogen ◽  
Carboxyl Oxygen Atom ◽  
Tetrahedral Geometry ◽  
Functional Theory ◽  
X Ray ◽  
Mechanical Methods ◽  
Elemental Analyses ◽  
Ft Ir

In this work, new Schiff baz ligand was synthesized by reaction of p-iminoacetophenone oxime with 3,5-dichlorosalicylaldehyde. Metal complexes of Co+2, Ni+2, Cu+2 and Zn+2 acetate metal salts were synthesized with this ligand. The ligand and complexes are characterized in experimental by their elemental analyses, X-ray, 1H-NMR, 13C-NMR, UV-Vis, FT-IR, magnetic susceptibility and thermogravimetric analyses (TGA) and also have been investigated by using quantum mechanical methods. The transition metals are coordinated to the schiff base through the azomethine nitrogen and the carboxyl oxygen atom. Obtained metal complexes were studied the magnetic properties and their geometries were determined. Co+2, Ni+2 and Zn+2 complexes have been found tetrahedral geometry and Cu+2 complex has been found four coordinated geometry.

A coordination polymer of mercury(II) formed by triazole-based and chloride linkers

2017 ◽  
Vol 72 (8) ◽  
pp. 573-577 ◽  
Author(s):  
Seyed Ghorban Hosseini ◽  
Keyvan Moeini ◽  
Mohammed S.M. Abdelbaky ◽  
Santiago García-Granda
Keyword(s):  
Coordination Polymer ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Coordination Numbers ◽  
H Nmr ◽  
Square Planar ◽  
Polymeric Chains ◽  
Ft Ir ◽  
Hybrid Coordination

AbstractIn this work, a coordination polymer formed from 4,5-diamino-3-methyl-4H-1,2,4-triazol-1-ium chloride (DAMT·HCl) and HgCl2 formulated as [Hg5(μ-DAMT)2(μ-Cl)6(μ3-Cl)2Cl2]n has been prepared and characterized by elemental analysis, FT-IR, 1H NMR spectroscopy, and single-crystal X-ray diffraction. X-ray analysis of the complex revealed an organic-inorganic hybrid coordination polymer containing three different mercury atoms with coordination numbers of 4 (HgN(μ-Cl)2(μ3-Cl)), 5 (Hg(μ-Cl)3(μ3-Cl)Cl), and 6 (HgN2(μ-Cl)2(μ3-Cl)2) and seesaw, octahedral, and square pyramidal geometries, respectively. The polymeric chains are extended to a three-dimensional (3D) array by C–H···Cl and N–H···Cl interactions. In addition to these hydrogen bonds, there are Hg···Cl interactions with the mercury atoms with coordination numbers 4 and 5 to complete their pseudo-square planar and -octahedral geometries, respectively.

Synthesis and Optical Studies of the 3,4-dimethoxy Benzaldehyde [5-(2-hydroxyphenyl)-1,3,4-oxadiazol-2-yl]Hydrazone Metal Complexes

2020 ◽  
pp. 95-100
Keyword(s):  
Optical Absorption ◽  
Absorption Coefficient ◽  
Metal Complexes ◽  
Mass Spectra ◽  
Energy Gap ◽  
Planar Geometry ◽  
Optical Absorption Spectra ◽  
Optical Studies ◽  
Tetrahedral Geometry ◽  
Square Planar

The aim of the present study is to synthesize and optical studies of 3,4-dimethoxy benzaldehyde [5-(2-hydroxyphenyl)-1,3,4-oxadiazol-2-yl]hydrazone metal complexes. Firstly, the 3,4-dimethoxybenzaldehyde [5-(2-hydroxyphenyl)-1,3,4-oxadiazol-2-yl] hydra zone was synthesized by the reaction of the 2-(5-hydrazino-1,3,4-oxadiazol-2-yl)phenol with 2,3-dimethoxybenzaldehyde in the ethanol as a solvent . Scondly, its complexes of Cr(III), Fe(III), Co(II) and Ni (II) have been synthesized. The synthesized coumpounds and its metal complexes were characterized by the FTIR, Mass spectra and UV-vis absorption. The results confirmed the suggested square planar geometry of the Ni (II) complex and tetrahedral geometry of the Co(II) complex, while Cr (III), Fe(III) complexes were assigned octahedral geometrics. The optical absorption spectra of those complexes in the wavelength range from 200-900 nm were studied.The results showed that the optical absorption is due to indirect allowed transitions of the compound and its complexes, the energy gap (Eg) of these compounds decreases in the order L> Ni (II)> Fe(III)> Co(II) and > Cr(III), the absorption coefficient (α), real and imaginary parts (ɛr,ɛi), and optical conductivity (σopt)were estimated.

Coumarins as ligands. Studies on metal complexes of 8-Amino-7-hydroxy-4-methylcoumarin and 7-Hydroxy-4-methylcoumarin-6-carboxylic acid

1972 ◽  
Vol 25 (4) ◽  
pp. 729 ◽  
Author(s):  
DK Rastogi
Keyword(s):  
Rare Earth ◽  
Carboxylic Acid ◽  
Metal Complexes ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Spectroscopic Studies ◽  
Nephelauxetic Effect ◽  
Square Planar ◽  
Visible Spectra ◽  
Rare Earth Metal Complexes

Some platinum and rare earth metal complexes of 8-amino-7-hydroxy-4- methylcoumarin, viz. Na2[R~(C10H2NO3)Cl4],H2O, [Ir(C10H8N03)2(0H)(H20)],- 3H20, [Ce(C10H8NO3)3(H2O)2I,6H2O, and [Pr(C10H8N03)3(H20)2],8H2O, and 7-hydroxy-4-methylcoumarin-6-carboxylic acid, viz. [Pd(CllH7O5)2], [Ce(CllH705)3- (H20)2],3HzO, and [Pr(CllH7O5)3(H2O)2], have been studied. These complexes have been isolated and characterized by analyses, conductometric, magnetic, and spectroscopic studies. An octahedral stereochemistry has been assigned to these complexes except for the PdII complex which has a typical square-planar stereo- chemistry. The visible spectra of the PrIII complexes show characteristic f-f transitions and the nephelauxetic effect (1-β) of these transitions has been evaluated.

scholarly journals Synthesis, Spectral Characterization and Pharmacological Significance of Cr(III) and Mn(II) Complexes with Schiff Base and Thiocyanate Ion as Ligands

2019 ◽  
Vol 11 (05) ◽  
Author(s):  
R. Govindharaju ◽  
P. Durairaj ◽  
T. Maruthavanan ◽  
M. Marlin Risana ◽  
T. Ramachandramoorthy
Keyword(s):  
Schiff Base ◽  
Free Radical ◽  
Ir Spectra ◽  
Metal Complexes ◽  
Magnetic Moment ◽  
Electronic Spectra ◽  
Metal Ion ◽  
Diffusion Method ◽  
Thiocyanate Ion ◽  
Ft Ir

Cr(III) and Mn(II) metal complexes of Schiff base ligand derived from phenylacetylurea condensed with salicylaldehyde (SBPS) and thiocyanate(SCN-) ion were synthesized by using microwave irradiation. Microwave assisted synthesis gives high yield of the complexes within a very short time. The molecular formulae and the geometry of the complexes have been deduced from elemental analysis, metal estimation, electrical conductance, magnetic moment, electronic spectra, FT- IR, Far IR spectra, cyclic voltammetry, thermal analysis and powder-XRD techniques. The molar conductance values indicate that the complexes are non-electrolyte (1:0) type. FT-IR spectra show that Schiff base and thiocyanate ion are coordinated to the metal ion in a monodentate manner. The electronic spectra and the magnetic moment indicate the geometry of the complexes is found to be octahedral. The antimicrobial activities of ligands and their Cr(III) and Mn(II) complexes were studied against the microorganisms, viz., E. coli, Klebsiella Pneumonia, P. aeruginosa, S. aureus, Bacillus cereus, Aspergillus flavus, Aspergillus niger, Aspergillus oryzae, Aspergillus sojae and Candida albicans by agar well diffusion method. The complexes show moderate activity against the bacteria and enhanced activity against the fungi as compared to free SBPS ligand. The free radical scavenging activity of the complexes and the ligands has been determined by measuring their interaction with the stable free radical, DPPH. The complexes have larger antioxidant activity as compared to the ligand. DNA-binding properties have been studied by fluorescence-emissions method. The results suggest that the complexes strongly bind to DNA because of metal complexes are well-known to speed up the drug action and the ability of a therapeutic agent which can frequently be enhanced upon coordination with a metal ion.

scholarly journals Metal Complexes of N-hydroxyethylnaphthalideneimine Schiff Base

1972 ◽  
Vol 27 (3) ◽  
pp. 304-307 ◽  
Author(s):  
R. K. Mehta ◽  
V. C. Singhi
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Spectral Data ◽  
Elemental Analysis ◽  
Magnetic Moment ◽  
Complex Molecule ◽  
Square Planar ◽  
Distorted Octahedral ◽  
Solid Complexes ◽  
Octahedral Configuration

The Schiff base, N-hydroxyethylnaphthalideneimine forms solid complexes with Mn (II) , Co (II), Ni (II), Cu (II), Zn (II), Cd (II), Pd (II) and UO2 (II). The structures of these compounds have been discussed on the basis of their elemental analysis, magnetic moment values and electronic spectral data. These studies have conclusively proved that UO2 (II) and Mn (II) complexes are octahedral in shape whereas the Cu (II) complex molecule displays a square planar or tetragonally distorted octahedral configuration. Co (II) , Ni (II) , Zn (II) and Cd (II) complexes are tetrahedral in structures while the Pd (II) compound is square planar.

scholarly journals Synthesis, Characterization and Antibacterial Activity Study of Cobalt(II), Nickel(II), Copper(II), Palladium(II), Cadmium(II) and Platinum(IV) Complexes with 4-Amino-5-(3,4,5-trimethoxyphenyl)-4H-1,2,4-triazole-3-thione

2021 ◽  
Vol 21 (6) ◽  
pp. 1514
Author(s):  
Waleed Abbas Jawad ◽  
Asim Alaa Abd Al-Hussein Balakit ◽  
Mahmoud Najim Abid Al-Jibouri
Keyword(s):  
Antibacterial Activity ◽  
Metal Complexes ◽  
Thermal Analyses ◽  
Free Ligand ◽  
Molar Conductance ◽  
Bidentate Ligand ◽  
Ring Closure ◽  
Tetrahedral Geometry ◽  
Visible Spectra ◽  
Elemental Analyses

New transition metal complexes of cobalt(II), nickel(II), copper(II), palladium(II), cadmium(II), and platinum(IV) with bidentate ligand 4-amino-5-(3,4,5-trimethoxyphenyl)-4H-1,2,4-triazole-3-thiol were synthesized and characterized by microelemental analyses (CHNS), Fourier-transform infrared (FT-IR), UV-Visible spectra, molar conductance, magnetic susceptibility and thermal analyses (TG-DSC). The ligand was synthesized by ring closure of potassium-2-(3,4,5-trimethoxybenzoyl) hydrazine carbodithioate with an excess amount of hydrazine, and then was acidified using hydrochloric acid. The ligand was used as Lewis bases to prepare metal complexes through the reaction of ratio (1:2) metal:ligand. The ligand was characterized by 1H-NMR and 13C-NMR and the previously described methods to identify the complexes. The results obtained from spectra and elemental analyses indicated the tetrahedral geometry around Cd(II) ion, square-planar for Cu(II) and Pd(II), and octahedral geometry around Co(II), Ni(II), and Pt(IV). All the metal complexes showed significant antibacterial activity in comparison with the free ligand. The antibacterial test of the platinum(IV) complex showed higher activity than other metal complexes against bacteria Staphylococcus aureus (G-positive) and Escherichia coli (G-negative).

scholarly journals Synthesis and Characterization of Some New Metals Complexes of [N-(4-Nitrobenzoyl Amino)-Thioxomethyl] Phenylalanine

2016 ◽  
Vol 13 (1) ◽  
pp. 113-121
Author(s):  
Baghdad Science Journal
Keyword(s):  
Molecular Structure ◽  
Magnetic Susceptibility ◽  
Palladium Complexes ◽  
Synthesis And Characterization ◽  
Conductivity Measurements ◽  
Tetrahedral Geometry ◽  
Visible Spectra ◽  
Ft Ir ◽  
Uv Visible

A new ligand [N-(4-nitrobenzoylamino)-thioxomethyl] phenylalanine is synthesized by reaction of 4-nitrobenzoyl isothiocyanate with phenylalanine (1:1). It is characterized by micro elemental analysis (C.H.N.S.), FT-IR, (UV-Vis) and 1H and 13CNMR spectra. Some metals ions complexes of this ligand were prepared and characterized by FT-IR, UV-Visible spectra, conductivity measurements, magnetic susceptibility and atomic absorption. From results obtained, the following formula [M(NBA)2] where M2+ = Mn, Co, Ni, Cu, Zn, Pd, Cd and Hg, the proposed molecular structure for these complexes as tetrahedral geometry, except copper and palladium complexes are have square planer geometry.

Thermally stable oligomer—Metal complexes based on oligo-ortho-aminophenol and oligophenylazomethinephenol

2006 ◽  
Vol 60 (4) ◽  
Author(s):  
H. Mart ◽  
M. Koç ◽  
V. Muradoğlu ◽  
H. Yürük
Keyword(s):  
Thermal Stability ◽  
Thermogravimetric Analysis ◽  
Metal Ions ◽  
Metal Complexes ◽  
Schiff Bases ◽  
Thermally Stable ◽  
Oxidative Polycondensation ◽  
Thermooxidative Decomposition ◽  
Polymer Metal ◽  
Thermal Stability Of

AbstractThe oligo-ortho-aminophenol was synthesized by the oxidative polycondensation of ortho-aminophenol with air oxygen. The oligophenylazomethinephenol was synthesized by the condensation of aniline with oligosalicylaldehyde. Metal complexes of these oligomers with Cu(II), Co(II), Zn(II), and Ni(II) were synthesized and characterized. Based on the results of thermogravimetric analysis, synthesized oligomer—metal complexes were more stable against heat and thermooxidative decomposition than some polymeric Schiff bases and polymer—metal complexes. Additionally, the presence of metal ions increased the thermal stability of oligo-ortho-aminophenol, while the thermal stability of oligophenylazomethinephenol was lowered.

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