Synthesis, characterization and thermodynamic study of copper(II) complexes with unsymmetric tetradentate Schiff base ligands and X-ray structure of {methyl-2-[N-[2-(5-chloro-2-phenolate)methylidynenitrilo]ethyl}aminato(-1)-1-cyclopentenedithiocarboxylatecopper(II)

Asadi, Mozaffar; Mohammadi, Khosro; Esmaielzadeh, Sheida; Etemadi, Bijan; Fun, Hoong‐Kun

doi:10.1016/j.ica.2009.07.025

Cited by 15 publications

(11 citation statements)

References 37 publications

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“…The analytical ligand concentration was kept constant and different concentration of metal ions (10 -5 -10 -4 M) in DMF were prepared and used as titrant. After preparation of the samples solution the time of one hour was given to the samples until they reach to the same as previous work [20,[25][26][27]. UV-Vis spectra were recorded in the range 250-700 nm.…”

Section: Solution Studies and Complex Formation Measurementsmentioning

confidence: 99%

Formation constants and thermodynamic parameters of bivalent Co, Ni, Cu and Zn complexes with Schiff base ligand: Experimental and DFT calculations

Esmaielzadeh¹,

Mashhadiagha²

2017

Bull. Chem. Soc. Eth.

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ABSTRACT. Formation constant (Kf) values of Schiff base ligand, L = methyl-2-{[1-methyl-2-(aceton)ethylidynenitrilo]ethyl}amino-1-cyclopentenedithiocarboxylate, with Co(II), Ni(II), Cu(II) and Zn(II) ions has been determined spectrophotometrically for 1:1 complex formation at constant ionic strength 0.01 M (NaClO4), and at various temperatures in DMF solvent. Thermodynamic studies of the complexes have been carried out and their stability were found in the order CoL > CuL > NiL > ZnL. The enthalpy, entropy and Gibbs free energy changes of the complexation reaction have been evaluated from the temperature dependence of the formation constant. Our experimental results revealed that the complexation process is spontaneous, exothermic and entropically unfavorable. Also, B3LYP/(LANL2DZ and ‫)٭٭‪6-311G‬‬ level density functional theory is applied on the structure and stability of Schiff base ligand and their complexes. HOMO-LUMO and binding energies were calculated to obtained stability of the complexes. The theoretical results are compared with experimental data.

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Section: Solution Studies and Complex Formation Measurementsmentioning

confidence: 99%

Formation constants and thermodynamic parameters of bivalent Co, Ni, Cu and Zn complexes with Schiff base ligand: Experimental and DFT calculations

Esmaielzadeh¹,

Mashhadiagha²

2017

Bull. Chem. Soc. Eth.

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“…To a solution of half unites ligands methyl-2-{N-(2 × -aminoethane)}-amino-1-cyclopentenedithiocarboxylate (Hcden), 28,29 methyl-2-(1-methyl-2'-aminoethane) amino-1-cyclopentenedithiocarboxylate (HcdMeen) 24,25 and methyl-2-(3-aminopropyl)amino-1-cyclopentenedithiocarboxylate (Hcdpd) 27 (1mmol) in methanol (20 mL) was added, with continuous stirring, diketon's derivatives (1mmol).…”

Section: Preparation Of the Schiff Base Ligandsmentioning

confidence: 99%

“…The competition between chelating and bridging coordination mode is an important factor in producing mono, di and polynuclear metal complexes. In view of the importance of tin compounds in medicinal chemistry and as a part of our ongoing work on metal Schiff base complexes, [24][25][26][27] herein, we describe synthesis and characterization of some tin(IV) Schiff base complexes with general formula . This work is also extended to present some well-known properties of the complexes, such as plausible descriptions of stability constants, HOMO-LUMO orbital energies and dipole moments as ascribed on the basis of DFT calculations.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, Spectral Studies, Antibacterial Evaluation, Thermodynamics and DFT Calculations of Dimethyltin(IV) Dichloride Schiff Base

Esmaielzadeh

Shekoohi

Sharif-Mohammadi

et al. 2015

ACSi

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Sn NMR, IR and mass spectroscopy. IR spectral data show that the fifth coordination position of tin atom is occupied by an oxygen atom of Schiff base ligands. In the light of titled techniques, trigonal bipyramidal geometry around the tin atom is proposed for the synthesized complexes. The in vitro antibacterial activities of the complexes against Staphylococcus aureus and Escherichia Coli have been studied. It was found that they possess significant antibacterial activity. Also, DFT/B3LYP method was used to analyze the electronic structures and study of the geometries. The thermodynamic formation constants of the complexes were determined spectrophotometrically at 25 °C in DMF solvent.

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“…In order to mimic such living systems and to shed some light on binding modes and to continue our investigation in the field of Schiff base complexes with NNOS coordination sphere [19][20][21][22][23], we report here the synthesis, characterization and spectral studies of the new complexes [Co(Chel)(PBu 3 )]ClO 4 .H 2 O where Chel = cd3OMesalMeen, cd4OMesalMeen, cd5OMesalMeen: Methyl-2-{[1-methyl-2-(2-hydroxy-3-, 4-, 5-methoxy-phenyl) methylidynenitrilo]ethyl}amino-1-cyclopentenedithiocarboxylate. The solid products are well characterized by elemental analyses, UV-Vis, NMR spectra, along with the assignment of their infrared spectra for most of the fundamental vibrations.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, physical characterization, antibacterial activity and thermodynamic studies of five coodrdinate cobalt(III) Schiff base complexes

Esmaielzadeh¹,

Zare²,

Azimian³

2016

Bull. Chem. Soc. Eth.

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ABSTRACT. Some five-coordinated cobalt(III) complexes were synthesized and characterized using elemental analysis, 1 H NMR and IR spectra. The formation constants and the thermodynamic parameters were measured spectrophotometrically for the 1:1 adduct formation of [Co(Chel)(PBu3)]ClO4.H2O where Chel = cd3OMesalen, cd4OMesalen, cd5OMesalen: methyl-2-{[1-methyl-2-(2-hydroxy-3-, 4-, 5-methoxyphenyl)methylidynenitrilo]ethyl}amino-1-cyclopentene-dithiocarboxylate, as acceptors, with some linear and cyclic amines as donors, in different solvents at constant ionic strength (I = 0.1 M NaClO4), and at various temperatures (T = 283-313 K). The results revealed that the formation constants of the Co(III) Schiff base complexes toward a given amines donor are as follow:The trend of the formation constants of the donors (amines) toward a given cobalt(III) complex is as follow: Im > 4-MeIm > BzIm and n-butylamine > sec-butylamine > tert-butylamine. Also the effect of the solvents on the formation constants of a given cobalt(III) Schiff base complex toward a given donor are as follow: CH3CN > DMF > EtOH. The ligands and their cobalt complexes have been screened for their antibacterial activities. All the free Schiff base ligands exhibit higher antibacterial activity than the cobalt(III) complexes.

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Synthesis, characterization and thermodynamic study of copper(II) complexes with unsymmetric tetradentate Schiff base ligands and X-ray structure of {methyl-2-[N-[2-(5-chloro-2-phenolate)methylidynenitrilo]ethyl}aminato(-1)-1-cyclopentenedithiocarboxylatecopper(II)

Cited by 15 publications

References 37 publications

Formation constants and thermodynamic parameters of bivalent Co, Ni, Cu and Zn complexes with Schiff base ligand: Experimental and DFT calculations

Formation constants and thermodynamic parameters of bivalent Co, Ni, Cu and Zn complexes with Schiff base ligand: Experimental and DFT calculations

Synthesis, Characterization, Spectral Studies, Antibacterial Evaluation, Thermodynamics and DFT Calculations of Dimethyltin(IV) Dichloride Schiff Base

Synthesis, physical characterization, antibacterial activity and thermodynamic studies of five coodrdinate cobalt(III) Schiff base complexes

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