Thermodynamics of Cobalt(III) Schiff base complexes in various solvents

Asadi, Mozaffar; Khah, M. Setoodeh; Kianfar, Ali Hossein

doi:10.1007/bf03245857

Cited by 12 publications

(4 citation statements)

References 17 publications

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“…The negative sign of the ΔS suggests that the degree of structural complexity (arrangement) of the activated complex was lower than that of the starting reactants and the decomposition reactions are slow reactions. The ΔH o value and its sign, is dependent on the heat of formation of the complex and the solvent effect 20 , in all cases, it is found that the ΔHº values are positive, so the Reactions are endothermic. Further, degrades with the subsequent loss of (benzene ring) species forming species with peak at m/e= 290.…”

Section: Kinetics Of Thermal Decomposition Of Some Prepared Complexesmentioning

confidence: 85%

Untitled

2011

IJPSR

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A new Sulfamethoxazole Schiff base (E)-4-(4-methoxybenzylideneamino)-N-(5-methylis-oxazol-3-yl) benzenesulfonamide (C 18 H 17 N 3 O 4 S), and its copper complex were synthesized and the structures elucidated on the basis of Physiochemical methods. The studies indicate an octahedral structure for the complexes with the (C 22 H 27 N 3 O 10 SCu) formula. The IR spectra suggest that the ligand act as tridentate (from oxygen and two nitrogen atoms) donor. Also the biological activity of the Schiff base and its Cu complex were studied.

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Section: Kinetics Of Thermal Decomposition Of Some Prepared Complexesmentioning

confidence: 85%

Untitled

2011

IJPSR

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“…The d  π* charge transfer depended on the charge density in the Schiff base. In the thermodynamic studies of the five-coordinated complexes with amines and formation of six-coordinated complexes this band shifts to lower energy because of the increasing charge density over the metal ion and the d  π* charge transfer was easier, so a new absorption band at 450-470 nm region (shoulder, d  π*) appeared and the absorption band at 650-750 nm vanished [33] (see Figure 1). The isosbestic point shows that there is one equilibrium system in the adduct formation.…”

Section: Uv-vis Spectral Studiesmentioning

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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“…The TEM images further revealed the stabilization of copper and zinc nanoparticles due to interaction with the (HL) ligand. This stabilization facilitates penetration of tumor cell membrane and cause the destruction of tumor cell by CuNPs and ZnNPs (50,51) . The CuNPs and ZnNPs sizes are of 50, 60 nm respectively.…”

Section: 8transmission Electron Microscopy (Tem)mentioning

confidence: 99%

Synthesis, of some transition metal (ΙΙ/ΙΙΙ)-Schiff base complexes and copper, zinc nanoparticle size bearing sulfonamide fragment : New drugs for antimicrobial and anticancer agents.

Salman

Sharaby

Fatah

et al. 2016

Al-Azhar Bulletin of Science

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A simple approach to the synthesis metal complexes and copper, zinc nano particles size (CuNPs, ZnNPs) of novel Schiff base of sulfonamide ligand (HL) resulted from the condensation of sulfametrole [N '-(4-methoxy-1,2,5-thiadiazol-3-yl]sulfanilamide and 1-(2-Furanyl) ethanon. The metal complexes and copper, zinc nano particles size (CuNPs, ZnNPs) of HL ligand were synthesized and characterized using different physico-chemical studies as elemental analyses, mass spectra, conductivity measurement, UV-vis Spectra, solid reflectance, IR spectra,, 1 H NMR spectra, magnetic susceptibility, thermal analyses (TGA and DTA), (TEM) Transmission Electron Microscope and their microbial and anticancer activities. The spectroscopic data of the complexes suggest their 1:2(L:M) complex structures. Also the spectroscopic studies suggested the octahedral structure for all complexes. The size and morphology investigation of copper and zinc nano particles (CuNPs, ZnNPs) with (HL) ligand by TEM images indicate that the copper and zinc nano (CuNPs, ZnNPs) show spherical shape with core shell of HL ligand. The synthesized Schiff base and its metal complexes, CuNPs, ZnNPs were screened for their bacterial, antifungal and anticancer activity. The activity data show that the metal complexes, CuNPs and ZnNPs to be more potent than the parent HL Schiff base ligand. Also the data show that the CuNPs and ZnNPs more potent than the metal complexes and than HL free ligand .

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Thermodynamics of Cobalt(III) Schiff base complexes in various solvents

Cited by 12 publications

References 17 publications

Untitled

Untitled

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

Synthesis, of some transition metal (ΙΙ/ΙΙΙ)-Schiff base complexes and copper, zinc nanoparticle size bearing sulfonamide fragment : New drugs for antimicrobial and anticancer agents.

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