Thermal stability of transition-metal complexes

Donia, Ahmed M.

doi:10.1016/s0040-6031(98)00472-9

Cited by 26 publications

(23 citation statements)

References 76 publications

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“…Some earlier works contain information about copper oxalate complexes forming in aqueous solutions [1] and investigations on their stability constants [2]. During the last decade, the thermal stability of copper oxalate complexes [3][4][5], the temperature dependence of standard thermodynamic constants [6] and the possibility of application of copper oxalate in the synthesis of superconducting materials [7] have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Study of copper complexes in saturated and unsaturated aqueous ammonium oxalate solutions containing Cu(II) impurity

Sangwal

Mielniczek‐Brzóska

2007

Fluid Phase Equilibria

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Section: Introductionmentioning

confidence: 99%

Study of copper complexes in saturated and unsaturated aqueous ammonium oxalate solutions containing Cu(II) impurity

Sangwal

Mielniczek‐Brzóska

2007

Fluid Phase Equilibria

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“…This fact should be related with the structure of the ligand where the thermal stability of Schiff base complexes shows no steady behavior. It depends, to a great extent, on the room temperature structures [42].…”

Section: Starink Methodsmentioning

confidence: 99%

Complexes of Schiff base of benzopyran-4-one derivative

Abdel-Kader

Amin

El-Ansary

2015

J Therm Anal Calorim

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New metal complexes of Schiff base (L) prepared from condensation reaction of 2-aminopyridine and 6-formyl-7-hydroxy-5-methoxy-2-methylbenzopyran-4-one with metal ions; Mn(II), Co(II), Ni(II) and Cu(II) are synthesized. Different analysis tools such as elemental analyses, FTIR, thermal analyses, conductivity, mass spectrometry, electronic spectra and magnetic susceptibility measurements are all used to elucidate the structures of the newly prepared metal complexes. The IR spectral data suggested that the ligand behaves as a monobasic bidentate ligand toward the central metal ion with ON donor atoms. The thermal decomposition kinetics of all complexes was estimated by Coats-Redfern. Ni-L and Co-L complexes were selected to study their thermal decomposition under non-isothermal conditions using Flynn-Wall-Ozawa and Starink methods at different three heating rates (5, 10 and 15°C min -1 ). The values of the activation energy (E) obtained by the all methods are in good agreement. All complexes are thermally stable as reflected from the high value of their activation energies. Ni-L complex has the highest thermal stability, and Mn-L complex has the lowest one indicating that Mn-L complex has fast rate of successive decomposition. The Schiff base L, Cu-L and Mn-L compounds were screened for in vitro cytotoxicity against normal standard fibroblast cells (3T3) using MTT assay. Among these compounds, Mn-L complex enhanced growth inhibition and cell death in a concentrationdependent manner for the standard fibroblast cells (3T3). Mn-L complex was then subjected against four human cancer cell lines; human hepatocellular carcinoma (Huh-7), human Hepatoblastoma (Hep G2) and human cervical cancer cells (HeLa & HeLa-Fas) for anticancer activity. Results indicate that Mn-L complex may be useful leads for anticancer drug development in the future.

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“…8. The activation energy of Pr(III), Gd(III) and Yb(III) complexes is expected to increase proportional to the decrease in the ionic radius [31]. This rule, however, appears to be not valid in the case of the Ln- …”

Section: Thermal Analysis Of the Ln-pme Complexesmentioning

confidence: 98%

Lanthanide Complexes with D-Penicillamine Methyl Ester: Formation Constants, Spectral and Thermal Properties

Sallam

Mahmoud

2006

Zeitschrift Für Naturforschung B

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The complex-formation of the lanthanide(III) cations with D-penicillamine methyl ester have been investigated in acidic and neutral media. The macroscopic protonation constants of the ligand and the formation constants of [Ln·Pme] 2 ] complexes have been determined from pH-metric data using BEST computer program. Species distribution diagrams of the complexes were obtained and plotted using SPE and SPEPLOT computer programs. Elemental analyses of the solid complexes indicate the formation of 1:1 metal:ligand species. Infrared spectra show that coordination takes place through the NH 2 , the SH and the C=O groups of the ligand. The complexes decompose in four steps as shown by their TG and DTA analysis with the formation of Ln 2 (SO 4 ) 3 as a final product. Activation energy values (∆ E a ) are correlated with the atomic radii of the metal ions. The mechanism of the thermal decomposition is proposed.

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Thermal stability of transition-metal complexes

Cited by 26 publications

References 76 publications

Study of copper complexes in saturated and unsaturated aqueous ammonium oxalate solutions containing Cu(II) impurity

Study of copper complexes in saturated and unsaturated aqueous ammonium oxalate solutions containing Cu(II) impurity

Complexes of Schiff base of benzopyran-4-one derivative

Lanthanide Complexes with D-Penicillamine Methyl Ester: Formation Constants, Spectral and Thermal Properties

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