scholarly journals Synthesis and Characterization of Tin (II) and Lead (II) Complexes with Benzylidene Aniline Ligand

2019 ◽  
pp. 56-65
Author(s):  
Tolessa Egeta Dufera ◽  
Sofani Tafesse ◽  
Ramesh Duraisamy
Keyword(s):  
Direct Method ◽  
Condensation Reaction ◽  
Organic Ligand ◽  
Analytical Techniques ◽  
Molar Conductivity ◽  
Metal Salts ◽  
Spectral Studies ◽  
Planar Geometry ◽  
Square Planar

The Schiff base (Benzylideneaniline molecule) and its complexes with Sn (II) and Pb (II) have been synthesized and characterized by various spectroscopic and electro-analytical techniques. The ligand, Benzylideneaniline has been synthesized by condensation reaction of benzaldehyde and aniline.The metal complexes were prepared by mixing of saturated solutions of metal salts and ligand in 1:2 ratios in methanol and Dimethylsulfoxide solvents, followed by their characterization using magnetic susceptibility, molar conductivity, chloride estimation and spectral studies. It was found that titled organic ligand acts as monodentate and in both complexes it is proposed to be interacted in metal to ligand 1: 2 ratio with the metals to form organotin(II) and organolead (II) complexes through the direct method. Overall experimental results show that a diamagnetic and square planar geometry of both complexes formed.

scholarly journals Synthesis and characterization of Co(II), Ni(II), Cu(II) and Zn(II) complexes with 3-salicylidenehydrazono-2-indolinone

2003 ◽  
Vol 68 (8-9) ◽  
pp. 641-647 ◽  
Author(s):  
Sandra Konstantinovic ◽  
Blaga Radovanovic ◽  
Zivojin Cakic ◽  
Vesna Vasic
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Molar Conductivity ◽  
Spectral Studies ◽  
Synthesis And Characterization ◽  
Planar Geometry ◽  
Spectroscopic Methods ◽  
Square Planar

Complexes of Co(II), Ni(II), Cu(II) and Zn(II) with 3-salicylidenehydrazono-2-indolinone were prepared. Their structure was established to be [MLCl].Cl by using elemental analysis and molar conductivity, as well as AA, FTIR, UV/VIS and 1H-NMR spectroscopic methods. The spectral studies indicated a square-planar geometry for the Ni(II) and Cu(II) complexes and a tetrahedral one for the Co(II) and Zn(II) complexes. The complexes were tested for antibacterial activity against Staphylococcus aureus, Enterococcus D, Proteus mirabilis, Escherichia coli, Bacillus anthracis, Pseudomonas aeruginosa and Candida albicans.

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 Spectroscopic and Biological Studies on Newly Synthesized Cobalt (II) and Nickel (II) Complexes with 2-Acetyl Coumarone Semicarbazone and 2-Acetyl Coumarone Thiosemicarbazone

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Sanjay Goel ◽  
Sulekh Chandra ◽  
Sudhanshu Dhar Dwivedi
Keyword(s):  
Magnetic Susceptibility ◽  
Metal Complexes ◽  
Antioxidant Activities ◽  
Molar Conductance ◽  
Metal Salts ◽  
Spectral Studies ◽  
Planar Geometry ◽  
Square Planar ◽  
Biological Studies ◽  
Infrared Spectral

Co(II) and Ni(II) complexes of general composition ML2X2(M = Co(II), Ni(II); X = Cl−,NO3 −) were synthesized by the condensation of metal salts with semicarbazone/thiosemicarbazone derived from 2-acetyl coumarone. The ligands and metal complexes were characterized by NMR, elemental analysis, molar conductance, magnetic susceptibility measurements, IR, and atomic absorption spectral studies. On the basis of electronic, molar conductance and infrared spectral studies, the complexes were found to have square planar geometry. The Schiff bases and their metal complexes were tested for their antibacterial and antioxidant activities.

scholarly journals Novel (N4) Macrocyclic Metal Complexes: Synthesis, Characterization, Spectral Studies and Anticancer Activity

2018 ◽  
Vol 5 (1) ◽  
pp. 51-63 ◽  
Author(s):  
Hanaa A. El-Boraey ◽  
Ohyla A. EL-Gammal
Keyword(s):  
Condensation Reaction ◽  
Spectral Studies ◽  
Planar Geometry ◽  
Human Breast ◽  
Nitrogen Ligand ◽  
Pyramidal Geometry ◽  
Square Planar ◽  
Square Pyramidal Geometry ◽  
Mcf 7

Introduction:A new series of mononuclear Fe(II), Co(II), Ni(II), Cu(II) and Pd(II) complexes correspond to tetradentate macrocyclic nitrogen ligandi.e.naphthyl-3,4:10,11-dibenzo,7-methylene,8-methyl,6-phenyl-1,5,9,13-tetraazacyclohexadecane-5,8-diene-2,12-dione metal(II) complexes, have been synthesized by the template condensation reaction.Methods:The complexes have been characterized by elemental analysis, spectral (IR, UV–Vis, and ESR, molar conductivity, and magnetic as well as thermal analysis measurements.Results:On the basis of above studies, an octahedral geometry has been proposed for all complexes except Cu(II) nitrate complex that adopt square pyramidal geometry, and square planar geometry for Pd(II) chloride complex, respectively.Conclusion:The thermal behavior and the kinetic parameters of degradation were determined using Coats-Redfern and Horowitz-Metzger methods. Moreover, thein vitroantitumor activity of the some synthesized complexes against human breast and human hepatocarcinoma cell lines (MCF-7) and (HePG2), respectively has been studied.

Design and Characterization of New Dinuclear Macrocyclic Dithiocarbamate Complexes by the Preparation of a Free Ligand Derived from Isopropylamine

2021 ◽  
pp. 1-15
Author(s):  
Noor Al-Huda A.H Al-Mohammadi ◽  
Aeed S.M Al-Fahdawi ◽  
Sattar S.I Al-Janabi
Keyword(s):  
Free Ligand ◽  
13C Nmr Spectroscopy ◽  
Macrocyclic Complexes ◽  
Planar Geometry ◽  
Basic Solution ◽  
Square Planar ◽  
Dithiocarbamate Ligand ◽  
Schiff Base Formation ◽  
Base Formation

The synthesis and structural characterization of new dithiocarbamate (DTC) ligand and some of its dinuclear transition metal complexes are described. The free dithiocarbamate ligand was prepared through several synthetic routes, including Schiff-base formation. The reaction of 2-aminopropane with terephthaldehyde leads to the formation of Schiff_base which is reduced by methanolic NaBH4 to the corresponding secondary diamine. Diamine( N,N'_ (1,4 phenylenebis (methylene)) bis(propan-2 amine))  reacts with (CS2) in a basic solution of (KOH) to provide the corresponding bis(dithiocarbamate) free_ligand, which undergoes complexation with the appropriate metal   (II) chloride to constitute macrocyclic complexes. Characterization of the ligand and its complexes was achieved by FTIR, UV-Vis, melting points, conductance, magnetic susceptibility, and 1H, 13C NMR spectroscopy. The analytical and spectroscopic data were employed to obtain the suggested geometries around metal centres. These studies revealed the formation of dinuclear macrocyclic complexes of the general formula [M(L)]2 (where M= Mn(II) , Fe(II), Co(II), Ni(II), Cu(II)  and Zn(II)), with tetrahedral. geometries for Mn(II) , Fe(II), Co(II) and Zn(II),  and square. planar geometry with Ni(II) and Cu(II) complexes.

scholarly journals Synthesis and Spectral Studies of 4,4′-(Hydrazine-1,2-diylidenedimethylylidene)-bis-(2- methoxyphenol) and Its Transition Metal Complexes with Promising Biological Activities

2020 ◽  
Vol 32 (7) ◽  
pp. 1768-1772
Author(s):  
Anita Rani ◽  
Manoj Kumar ◽  
Hardeep Singh Tuli ◽  
Zahoor Abbas ◽  
Vinit Prakash
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Schiff Base Ligand ◽  
Biological Activities ◽  
Condensation Reaction ◽  
Analytical Techniques ◽  
Spectral Studies

The study describes the synthesis, characterization and biological activity of a novel Schiff base ligand and its transition metal complexes. The Schiff base ligand was obtained by a condensation reaction between 4-hydroxy-3-methoxybenzaldehyde (p-vanillin) and hydrazine hydrate using ethanol as solvent. A new series of Ni(II) and Fe(III) complexes were also derived by reaction of prepared Schiff base ligand with NiCl2 and FeCl3. Both the ligand and its metal complexes were characterized by solubility, melting point and elemental analysis. These compounds were further identified by analytical techniques, FTIR, NMR and mass spectrometry. The ligand and its transition metal complexes were also subjected to in vitro biological activities i.e. antimicrobial, antiangiogenic and DNA photo cleavage. For antimicrobial activity compounds were tested against two strains of bacteria and two strains of fungi. Different concentrations of prepared compounds were treated with fertilized chicken eggs and plasmid DNA to find out antiangiogenic and DNA photocleavage activity, respectively.

scholarly journals Synthesis and Spectral Characterization of Mn(II) and Co(II) Complexes with Tetradentate Macrocyclic Ligand

2021 ◽  
Vol 33 (9) ◽  
pp. 2207-2211
Author(s):  
Usha Bansal ◽  
Samta Goyal ◽  
Swati Agrawal
Keyword(s):  
Metal Complexes ◽  
Infrared Spectra ◽  
Elemental Analysis ◽  
Magnetic Moment ◽  
Macrocyclic Ligand ◽  
Molar Conductance ◽  
Octahedral Geometry ◽  
Metal Salts ◽  
Spectral Studies

Manganese(II) and cobalt(II) complexes were synthesized with [N4] tetradentate macrocyclic ligand using different metal salts i.e. MnCl2, Mn(NO3)2, CoCl2 and Co(NCS)2. The ligand was prepared by condensation of glyoxal and carbahydrazide. All these were characterized by elemental analysis, molar conductance measurements, magnetic moment, IR, mass, electronic and EPR spectral studies. Elemental analysis indicates that the complexes have composition MLX2 where (X = Cl–, NO3 –,NCS–). All the complexes were found to be non-electrolytic in nature so can be formulated as [MLX2]. Infrared spectra of metal complexes suggest that the ligand behaves as tetradentate. On the basis of magnetic moment, electronic and EPR spectral data, all the metal complexes were found to be high spin with octahedral geometry.

scholarly journals Synthesis and Characterization of Catecholato Copper(II) Complexes with Sterically Hindered Neutral and Anionic N3 Type Ligands: Tris(3,5-diisopropyl-1-pyrazolyl)methane and Hydrotris(3,5-diisopropyl-1-pyrazolyl)borate

Inorganics ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 37 ◽  
Author(s):  
Kiyoshi Fujisawa ◽  
Tetsuya Ono ◽  
Moemi Okamura
Keyword(s):  
Planar Geometry ◽  
X Ray ◽  
Pyramidal Geometry ◽  
Square Planar ◽  
Ct Transitions ◽  
Sterically Hindered ◽  
Protonated Ligand ◽  
Square Pyramidal Geometry ◽  
Oxidation State Of Copper

Three catecholato copper(II) complexes, [Cu(catCl4)(L1′)], [Cu(catBr4)(L1′)], and [Cu(catCl4)(L1H)], supported by sterically hindered neutral and anionic N3 type ligands: tris(3,5-diisopropyl-1-pyrazolyl)methane (referred to as L1′) and hydrotris(3,5-diisopropyl-1-pyrazolyl)borate (referred to as L1−), are synthesized and characterized in detail. Their X-ray structures reveal that both [Cu(catCl4)(L1′)] and [Cu(catBr4)(L1′)] complexes have a five-coordinate square-pyramidal geometry and [Cu(catCl4)(L1H)] complex has a four-coordinate square-planar geometry. The L1H is unusual protonated ligand that controls its overall charge. For the three catecholato copper(II) complexes, the oxidation state of copper is divalent, and catechol exists in catecholate as two minus anion. This difference in coordination geometry affects their d-d and CT transitions energy and ESR parameters.

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

2017 ◽  
Vol 13 (2) ◽  
pp. 1-15
Author(s):  
Rita Bhattacharjee Virupaiah Gayathri
Keyword(s):  
Metal Ion ◽  
Synthesis And Characterization ◽  
Planar Geometry ◽  
Conductivity Measurements ◽  
Spectral Techniques ◽  
Mass Spectral ◽  
Square Planar ◽  
Elemental Analyses ◽  
Quinazoline Derivatives

A series of palladium(II) halo complexes of the types [PdX 2 L 2 ].nH 2 O {n = 0, X = Cl, L = L 2 , L 4 and L 5 ; X = Br, L = L 2 ; n = 1, X = Cl, L = L 1 and L 3 } and Pd 2 X 4 L 3 [X = Br, L = L 1 , L 3 , L 4   and L 5 ] were prepared where L is 6-R-5,6- dihydrobenzoimidazo quinazoline (R-Diq; where R = ethyl: L 1 / n or i-propyl: L 2 , L 3 / n or i-butyl: L 4 , L 5 ) and characterized by elemental analyses, conductivity measurements, TGA, infrared, electronic, NMR and mass spectral techniques. Based    on these studies monomeric/dimeric structure with a square planar geometry around the metal ion was proposed for all the complexes. Some of the complexes were investigated for anti-microbial activity.

Synthesis and Characterization of New N-Alkylamino-3,5-diphenylpyrazole Ligands and Reactivity Toward PdII and PtII. Study of the cis–trans Isomerization

2010 ◽  
Vol 63 (2) ◽  
pp. 257 ◽  
Author(s):  
Gemma Aragay ◽  
Josefina Pons ◽  
Vicenç Branchadell ◽  
Jordi García-Antón ◽  
Xavier Solans ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Trans Isomer ◽  
Molar Ratio ◽  
Acetonitrile Solution ◽  
Synthesis And Characterization ◽  
Planar Geometry ◽  
Stable Form ◽  
Trans Isomerization ◽  
Square Planar

In this paper, the synthesis and characterization of two new N-alkylaminopyrazole ligands, 1-[2-(ethylamino)ethyl]-3,5-diphenylpyrazole (dpea) and 1-[2-(octylamino)ethyl]-3,5-diphenylpyrazole (dpoa) are reported. The reaction of these ligands with [MCl2(CH3CN)2] (M = PdII, PtII) affords the following square planar complexes: cis-[MCl2(NN′)] (M = PdII: NN′ = dpea, 1; dpoa, 2; M = PtII: NN′ = dpea, 3; dpoa, 4). Reaction of [PdCl2(CH3CN)2] and dpea or dpoa in 1:2 M:NN′ molar ratio, in the presence of NaBF4, yields complexes [Pd(NN′)2](BF4)2 (NN′ = dpea, [5](BF4)2); dpoa, [6](BF4)2). The solid-state structures of complexes 1, 3, and [5](BF4)2 have been determined by single-crystal X-ray diffraction methods. In complexes 1 and 3, the dpea ligand is coordinated through the Npz and Namino atoms to the metallic centre, which completes its coordination with two chlorine atoms in a cis disposition. For complex [5](BF4)2, the crystal structure consists of cations involving a [Pd(Npz)2(Namino)2]2+ core with a cis disposition of the two dpea ligands in a square-planar geometry and BF4 – anions. Theoretical calculations were carried out to optimize the geometries of the cis and trans isomers of the [Pd(dpea)2]2+ cation and of the [Pd(dpea)2](BF4)2 complex. The results show that the trans isomer is the most stable for [Pd(dpea)2]2+, in contrast with the cis stereochemistry observed in the crystal structure of [Pd(dpea)2](BF4)2. The calculations also predict that in acetonitrile solution, the dissociation of this complex into the corresponding ions is thermodynamically favourable. The cis–trans isomerization process of [Pd(dpea)2]2+ in acetonitrile solution has been studied by NMR spectroscopy at different temperatures. These experimental results confirm that the trans isomer is the thermodynamically most stable form of the complexes [5](BF4)2 and [6](BF4)2.

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