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.

scholarly journals Synthesis and Characterization Studies of Cobalt(II), Nickel(II), Copper(II) and Zinc(II) Complexes of Carboxymethyl-N-Methyl-N-Phenyl Dithiocarbamate

2018 ◽  
Vol 34 (6) ◽  
pp. 3064-3069 ◽  
Author(s):  
Lekshmi V. Kumar ◽  
G. Rathika Nath
Keyword(s):  
Metal Complexes ◽  
Elemental Analysis ◽  
Electronic Spectra ◽  
Molar Conductance ◽  
Molar Ratio ◽  
Planar Geometry ◽  
Tetrahedral Geometry ◽  
Square Planar ◽  
13C Nuclear Magnetic Resonance ◽  
Characterization Studies

Complexes of carboxymethyl-N-methyl-N-phenyl dithiocarbamate (DTC) with cobalt(II), nickel((II), copper(II) and zinc(II) complexes were synthesized in 1:2 molar ratio with general formula [M(DTC)2],{M=Co(II)/Ni(II)/Cu(II)/Zn(II)} and characterized by elemental analysis, molar conductance, infrared and electronic spectra. The ligand structure was confirmed by 1H and 13C nuclear magnetic resonance spectrum. The measured molar conductance values indicate the non-electrolytic nature of the metal complexes. The elemental analysis, infrared, electronic spectra and magnetic moment suggest that the coordination of DTC occurred through sulphur and oxygen atom as a bidentate. The cobalt(II) and zinc(II) complexes were found to coordinate in a tetrahedral geometry and complexes and nickel(II) and copper(II) complexes coordinate in a square planar geometry. Thermal analysis was carried out to ascertain the thermal stability of the metal complexes. By using powder XRD measurements, the lattice parameters, space group and grain size were determined. The scanning electron microscope images reveal the surface morphology of the metal complexes.

scholarly journals Synthesis and Spectroscopic Characterization for Some Metal ion Complexes with 2-Hydroxy-3-((5-Mercapto-1,3,4-Thiadiazol-2-yl)Diazenyl)-1-Naphthaldehyde

2016 ◽  
Vol 13 (2) ◽  
pp. 105-114
Author(s):  
Baghdad Science Journal
Keyword(s):  
Metal Complexes ◽  
Metal Ion ◽  
Mass Spectra ◽  
Spectroscopic Characterization ◽  
Bidentate Ligand ◽  
Molar Ratio ◽  
Theoretical Treatment ◽  
Spectroscopic Techniques ◽  
Metal Ion Complexes ◽  
Square Planar

New metal ion complexes were synthesized with the general formula; K[PtLCl4], [ReLCl4] and K[ML(Cl)2] where M = Pd(II), Cd(II), Zn(II) and Hg(II), from the Azo ligand (HL) [2-Hydroxy-3-((5-mercapto-1,3,4-thiadiazol-2-yl)diazenyl)-1-naphth aldehyde] (HL) the ligand was synthesized from (2-hydroxy-1-naphthaldehyde) and (5-amino-1,3,4-thiadiazole-2-thiol). The ligand and its metal complexes are characterized by phisco- chemical spectroscopic techniques (FT.IR, UV-Vis and Mass spectra, elemental analysis, molar conductivity, Atomic Absorption, Chloride contain and magnetic susceptibility). The spectral data suggest that the (HL) behaves as a bidentate ligand in all complexes. These studies revealed tetrahedral geometries for all metal complexes, except square planar for Pd(II) complex and except octahedral geometry for Pt(IV) and Re(V) complexes. The study of complexes formation via molar ratio of (M:L) as (1:1). Theoretical treatment of this ligand and its metal complexes in gas phase using Hyper chem.8 was preformed.

scholarly journals Synthesis and Structural Studies of Some Inorganic Polymers of Succinoyl Carboxymethyl Cellulose

2011 ◽  
Vol 8 (4) ◽  
pp. 1993-1999 ◽  
Author(s):  
H. D. Juneja ◽  
Manisha Joshi ◽  
N. T. KhatiI
Keyword(s):  
Ir Spectroscopy ◽  
Carboxymethyl Cellulose ◽  
Aqueous Media ◽  
Octahedral Geometry ◽  
Planar Geometry ◽  
Inorganic Polymers ◽  
Structural Studies ◽  
Tetrahedral Geometry ◽  
Square Planar ◽  
Uv Reflectance

The inorganic polymers containing transition metals such as Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) were synthesized by using succinoyl carboxymethyl cellulose (SCMC) in aqueous media. The newly synthesized polymers were characterized by elemental analysis, IR spectroscopy, TG analysis, UV reflectance spectra and magnetic moment. On the basis of these studies, the composition of the polymeric unit was found to be [M(II)L]n, [Mʼ(II)L.2H2O]n, {[Mˮ(II)L.2H2O]n H2O}, where M= Zn(II), Mʼ = Mn(II), Ni(II) and Cu(II) and Mˮ = Co(II), L = SCMC ligand. On the basis of instrumental techniques, it has been found that the [Zn(II)(SCMC)]n inorganic polymer has tetrahedral geometry, whereas {[Cu(II)(SCMC)].2H2O}n has square planar geometry and [Mn(II)(SCMC).2H2O]n, {[Co(II)(SCMC).2H2O)].H2O}n and [Ni(II) (SCMC).2H2O]n have octahedral geometry. The decomposition temperatures of the inorganic polymers have been determined by TGA. The TGA reveal that the Mn(II) polymer of SCMC is highly thermally stable than rest of the polymers and these polymers can be used as thermal resisting materials.

Synthesis and Photophysical Study of Divalent Complexes of Chelating Schiff Base

2020 ◽  
Vol 1 (01) ◽  
pp. 5-16
Author(s):  
Alaa A. Rashad ◽  
Farah Muaiad ◽  
Ahmed Ahmed ◽  
EkhlasA. Salman ◽  
Evon Akram
Keyword(s):  
Schiff Base ◽  
Surface Morphology ◽  
Theoretical Study ◽  
Energy Gap ◽  
Photophysical Properties ◽  
Schiff Base Complex ◽  
Tetrahedral Geometry ◽  
Force Microscopy ◽  
Atomic Force ◽  
Square Planar

 Background: Schiff base compounds derivative from1,2,4-triazole, and their transition metal complexes play an essential role in coordination and bioinorganic chemistry due to biological and industrial applications. Objective: The work aims to prepare and characterize of 1, 2, 4-triazole Schiff base and its complexes with a theoretical study using  PM3 calculation and HyperChem program, photophysical properties, and surface morphology for these complexes. Methods: 1, 2, 4-triazole Schiff base prepared by condensation reaction between  4-Amino-3-mercapto-5-phenyl-4H-1,2,4-triazole and 2-hydroxy-1-naphthaldehyde, then Schiff base reacted with Co2+, Ni2+,  and Cu2+ ions,   the synthesized 1, 2, 4-triazole Schiff base, and its complexes were characterized by infrared spectra, magnetic susceptibility, conductivity measurements, photophysical properties, and surface morphology measured by atomic force microscopy. The practical results were reinforced with a theoretical study for these Schiff base complexes. Then the proposed structures of the prepared complexes. Results: 1, 2, 4-triazole Schiff base act as a chelate ligand. The coordination has occurred through the oxygen of the phenolic group O-H and the nitrogen of the imine group N=C of Schiff base with divalent metal ions. Cobalt complex has a tetrahedral geometry, while the nickel and copper complexes have square planar geometries. The stability of all compounds was studied by calculating the energy gap by diffuse reflectance spectroscopy and theoretical calculations. Copper Schiff base is a more stable complex due to the lower value of the energy gap, and the copper Schiff base complex is more semiconductivity than the other complexes. Surface morphology, properties of chelating  Schiff base ligand and its complexes measured by atomic force microscopy, cobalt Schiff base complex is higher roughness. The bond length of (-C=N-), (-C-O-),(M-O), and (M-N)  are affected in the coordination with metal ions, the bond length of the square planar geometry more affected than tetrahedral geometry. Conclusion: All compounds were prepared successfully, characterized, and photophysical properties were studied.  

Synthesis and Characterization of Palladium(II) Complexes with Substituted Dihydrobenzoimidazoquinazoline Derivatives

2016 ◽  
Vol 15 (2) ◽  
pp. 17-32
Author(s):  
Rita Bhattacharjee
Keyword(s):  
Thermal Analysis ◽  
Biological Activity ◽  
Mass Spectra ◽  
Molar Conductivity ◽  
Synthesis And Characterization ◽  
Planar Geometry ◽  
Conductivity Measurements ◽  
Square Planar

A series of palladium(II) halo complexes of the types[PdX2L2].nH2O {n = 0, X = Cl, L = L4and L6; X = Br, L = L3,L4, L5 and L6; n = 2, X = Cl, L = L3and L7, X = Br, L = L1};Pd2X4L2 {X = Cl, Br, L = L2 and L8} and Pd2X4L3 [X = Cl, L= L1; X = Br, L = L7] were prepared where L is 6-R-5,6-dihydrobenzoimidazo quinazoline (R-Diq; where R =phenyl: L1/furyl: L2/thiophenyl: L3/o- or phydroxyphenyl: L4, L5/o- or p-chlorophenyl: L6,L7/dimethylaminophenyl: L8and characterized byelemental analyses, molar conductivity measurements,TGA, infrared, electronic, NMR and mass spectraltechniques. Based on these studies, monomeric/dimericstructure with a square planar geometry around the metalion was proposed for these complexes. Anti-microbialactivity for some of the synthesized complexes wereinvestigated.Keywords: dihydrobenzoimidazoquinazoline, palladium(II),thermal analysis, mass spectra, biological activity.

scholarly journals Optical Studies on KBr:Tl and KCl-Br:Tl Mixed Crystals

2010 ◽  
Vol 7 (2) ◽  
pp. 425-432
Author(s):  
P. Eswaran ◽  
A. Anbagi ◽  
S. Nagarajan
Keyword(s):  
Optical Absorption ◽  
Single Crystals ◽  
Absorption Spectra ◽  
Emission Band ◽  
Mixed Crystals ◽  
Optical Absorption Spectra ◽  
Optical Studies ◽  
Excitation Spectra ◽  
X Ray ◽  
Wavelength Side

Optical absorption spectra of KBr:Tl+(0.0125 mol%) single crystals shows A, B and C bands around 258, 220 and 210 nm respectively. In KCl0.1Br0.9:Tl+(0.0125 mol%) mixed crystals exhibit slightly broadening of the A-band towards lower wavelength side. The broadening of the absorption spectra are suggested to be due to some complex Tl+centers involving Br-and Cl-ions formed in the mixed crystals. When excited at A, B and C-bands of Tl+ions, PL of KBr:Tl+showed emission band around 320 with a prominent shoulder around 365 nm. In KCl0.1Br0.9mixed crystals the shoulder around 365 nm is not prominent due to the perturbing influence of Cl-ions. Addition bands in the excitation spectra are attributed to the presence of Tl+dimmers. PSL observed in X-ray irradiated crystals resembled their respective PL emissions indicating that PSL in them is due to Tl+ions.

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 Mixed Ligand Complexes of Copper(II) and Cobalt(II) with Hydrazones Derivatives and ortho-Vanillin: Syntheses, Characterizations and Antimicrobial Activity

2019 ◽  
Vol 35 (6) ◽  
pp. 1722-1730
Author(s):  
Israa A. Alghamdi ◽  
Mohamed Abdelbaset ◽  
Ines El Mannoubi
Keyword(s):  
Metal Complexes ◽  
Antimicrobial Activities ◽  
Molar Conductance ◽  
Mixed Ligand ◽  
Planar Geometry ◽  
Central Metal ◽  
Bacterial Strains ◽  
Hydrazone Ligand ◽  
Metal Atoms ◽  
Square Planar

The purpose of this paper was to synthesis new mixed-ligand Cu(II) and Co(II) metal complexes utilizing bidentate and tridentate donor hydrazones derivatives as primary ligands and o-vanillin as co-ligand. The obtained compounds were characterized by elemental analysis, Infrared, UV-Vis., 1H-NMR, Mass spectra, molar conductance, thermal analysis and atomic absorption spectroscopy (ASS). Spectroscopic analysis results indicated that the hydrazone ligand (L1) behave as tridentate (ONO) and forms metal complexes having distorted square planar geometry. While the ligands (L2, L3 AND L4) behave as bidentate (NO) and forms metal complexes having octahedral geometry around the central metal atoms. The antimicrobial potentials were assessed for the ligand (L2) and its metal complexes only and were screened against six types of bacterial strains and one fungal strain. The antimicrobial activities results of the tested compounds showed enhanced activity of the complexes over their parent ligands.

scholarly journals Structures of Pt(0)P3, Pt(0)P4 and Pt(II)P4 – Distortion isomers

2020 ◽  
Vol 43 (1) ◽  
pp. 111-116
Author(s):  
Milan Melník ◽  
Peter Mikuš
Keyword(s):  
Structural Parameters ◽  
Donor Ligands ◽  
Planar Geometry ◽  
Bidentate Ligands ◽  
Tetrahedral Geometry ◽  
Cooperative Effects ◽  
Square Planar ◽  
Crystal Class ◽  
Planar Geometries

AbstractIn this review are analyzed and classified crystallographic and structural parameters of P(0)P3, Pt(0) P4 and Pt(II)P4 derivatives – distortion isomers. Some of the isomers are differing not only by degree of distortion but also by crystal class. There are three types of organo-phosphines which build up the respective geometry about the platinum atoms. In Pt(0)P3 a distorted trigonal planar geometry is build up by three monodentate PPh3 ligands. In Pt(0)P4 a tetrahedral geometry with various degree of distortion is build up by a pair of homo-bidentate ligands. In Pt(II)P4 isomers a square-planar geometries with various degree of distortion are build up by bidentate-P,P’donor ligands, (except one example of isomers, where a tetradentate is involved). The bidentate-P,P’-donor ligands form: four-(PNP,PCP), five-(PC2P) and six-(PC3P) metallocyclic rings. The tetradentate forms five-(PC2P). There are some cooperative effects between Pt–P bond distances and the metallocyclic rings, and at the same time a distortion of the respective geometry increases.

scholarly journals Synthesis and Characterization of Metallic Gel Complexes Derived from Carboxymethyl Cellulose

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
H. D. Juneja ◽  
Manisha Joshi ◽  
J. P. Kanfade
Keyword(s):  
Thermal Analysis ◽  
Ir Spectra ◽  
Carboxymethyl Cellulose ◽  
Octahedral Geometry ◽  
Synthesis And Characterization ◽  
Planar Geometry ◽  
Tetrahedral Geometry ◽  
Square Planar ◽  
Thermal Data

The oxaloyl carboxymethyl cellulose (OCMC) complexes of Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) metal ions have been synthesized and the coordination of OCMC in these complexes has been investigated through IR spectra, reflectance spectra, and thermal analysis. On the basis of spectral and thermal data an octahedral geometry was assigned to[Mn(II)OCMC(H2O)2]nand[Co(II)OCMC(H2O)2]n, square planar geometry was assigned to[Cu(II)OCMC]n, and tetrahedral geometry was assigned to[Ni(II)OCMC]nand[Zn(II)OCMC]nMetallic Gel complexes.

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