Some new Schiff base ligands giving a NNOS coordination sphere and their nickel(II) complexes: Synthesis, characterization and complex formation

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

doi:10.1016/j.poly.2009.03.018

Cited by 25 publications

(32 citation statements)

References 37 publications

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“…The Schiff base ligands, H 2 cd3OMesalMeen, H 2 cd4OMesalMeen, H 2 cd5OMesalMeen, were prepared according to procedures described in the literature [20,[24][25][26]. The complexes shown in Scheme 1 were synthesized as follow: To a refluxing solution of the unsymmetrical ligands (H 2 cd3-, 4-, 5-OMesalMeen) (0.1 mmol) in 10 mL of chloroform/methanol mixture (2:1) under N 2 atmosphere, was added a solution of Co(CH 3 COO) 2 .4H 2 O (1 mmol) in methanol (10 mL) drop wisely.…”

Section: Synthesis and Characterization Of Complexesmentioning

confidence: 99%

“…The weak bands at 2920-2970 cm -1 in the ligands are related to C-H modes of vibrations. In cobalt(III) complexes containing PBu 3 these bands were very stronger, as assignable to C-H vibrations of PBu 3 [22]. The strong absorption band between 1600-1634 cm -1 corresponding to azomethine (C=N) groups, this band is shifted to lower frequencies by 4-22 cm -1 relative to the free ligand upon the coordination of the nitrogen atoms [28].…”

Section: Ir Spectra and Mode Of Bondingmentioning

confidence: 99%

“…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%

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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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Section: Synthesis and Characterization Of Complexesmentioning

confidence: 99%

Section: Ir Spectra and Mode Of Bondingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…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

Self Cite

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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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Some new unsymmetrical diimino tetradentate schiff base derived from 3,4-Diaminobenzophenone: Synthesis, characterization and the formation constant of Ni(II) and Cu(II) complexes

Asadi

Khah

2010

JICS

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Some new unsymmetrical diimino tetradentate Schiff bases derived from 3,4-diaminobenzophenone, (N-salicyliden-N'-5-OMe.salycyliden)-3,4-diaminobenzophenone (H 2 sal-5-OMe.sal.dabp) (H 2 L 1 ), (H 2 sal-5-Br.sal.dabp) (H 2 L 2 ), (H 2 sal-5-Cl.sal.dabp) (H 2 L 3 ) and (H 2 sal-5-NO 2 .sal.dabp) (H 2 L 4 ) and their Ni(II) and Cu(II) complexes were synthesized and characterized by elemental analysis, IR, 1 H NMR, UV-Vis spectra and mass spectra. The thermodynamic formation constants of the complexes were determined spectrophotometrically at constant ionic strength (0.1 M NaClO 4 ) at 25 ºC in DMF and their free energies of formation were calculated at 25 ºC.

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Some new Schiff base ligands giving a NNOS coordination sphere and their nickel(II) complexes: Synthesis, characterization and complex formation

Cited by 25 publications

References 37 publications

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

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

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

Some new unsymmetrical diimino tetradentate schiff base derived from 3,4-Diaminobenzophenone: Synthesis, characterization and the formation constant of Ni(II) and Cu(II) complexes

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