Thermal behaviour of malonic acid, sodium malonate and its compounds with some bivalent transition metal ions

Caires, Flávio Júnior; Lima, Liliane Spazzapam; Carvalho, Cláudio Teodoro de; Giagio, R. J.; Ionashiro, Massao

doi:10.1016/j.tca.2009.08.013

Cited by 43 publications

(28 citation statements)

References 21 publications

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“…The DSC curve presented in Fig. agrees well with the data reported in , . According to the literature , malonic acid crystals undergo a solid phase transition, a melting step and a decomposition step upon heating.…”

Section: Resultsmentioning

confidence: 99%

“…agrees well with the data reported in , . According to the literature , malonic acid crystals undergo a solid phase transition, a melting step and a decomposition step upon heating. It can therefore be assumed that the first endothermic peak at 383.15 K in the DSC curve is due to the solid phase transition from the β ‐form to the α ‐form, while the second and third endothermic peaks at 418.15 and 488.15 K are considered to be the melting and decomposition, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Experimental Assessment and Modeling of the Solubility of Malonic Acid in Different Solvents

Wang

et al. 2018

Chem Eng & Technol

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Malonic acid is widely applied in the pharmaceutical industry as a drug intermediate and for acidity control in drug production. Its solubility in five pure solvents and one binary solvent mixture was measured. The results reveal that, in the solvents studied, the solubility increases with increasing temperature. Different thermodynamic models were applied to correlate the solubility data in the pure and binary solvents and were found to match well with the experimental data. Computational investigations performed using molecular dynamics simulations showed that, in the pure alcohol solvents, both the solute‐solvent interaction and the solvent‐solvent interaction affect the solubility behavior, while in the case of the pure solvents acetone and acetonitrile, the solute‐solvent interaction is the key factor.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Experimental Assessment and Modeling of the Solubility of Malonic Acid in Different Solvents

Wang

et al. 2018

Chem Eng & Technol

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“…The eight target complexes present similar thermal behavior, thus, in this paper, we only give the thermogravimetric and differential thermal analysis curves of [ 6 show that the weight losses during the first step for these complexes are 1.73% and 1.66% and between 70 and 150 ºC. These values have good agreement with the loss of one lattice of water molecules depending on the complexes (19), and the calculated values are 1.92% and 1.85%, respectively. In addition, the target complexes are without endothermic peak and weightlessness at 150-230 ºC, which illustrate that the water does not participate in coordination with the target complexes, because the coordination water of the analogous complexes is usually released over 200 ºC.…”

Section: Thermal Analysismentioning

confidence: 96%

Synthesis and fluorescence properties of 1,2,4‐triazolo[3,4‐b]‐1,3,4‐thiadiazol derivatives and their terbium complexes

Zhang

Chai

et al. 2014

Luminescence

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Eight novel 1,2,4-triazolo[3,4-b]-1,3,4-thiadiazol derivatives have been designed and synthesized, and their corresponding Tb(3+) complexes were also prepared successfully. The fluorescence properties and fluorescence quantum yields of the target complexes were investigated, the results showed that the ligands were an efficient sensitizer for Tb(3+) luminescence, and the target complexes exhibited characteristic fluorescence emissions of Tb(3+) ion. The fluorescence intensity of the complex substituted by chlorine was stronger than that of other complexes. The substituents' nature has a great effect upon the electrochemical properties of the target complexes. The results showed that the introduction of the electron-withdrawing groups tended to decrease the oxidation potential and highest occupied molecular orbital energy levels of the target Tb(3+) complexes; however, introduction of the electron-donating groups can increase the corresponding complexes' oxidation potential and highest occupied molecular orbital energy levels.

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“…The papers published are concerned with the influence of the lanthanide contraction in the dehydration of malonates in solid state, discussed on the basis of TG curves [5]; The onset temperatures of dehydration and decomposition which measures the relative stability of anhydrous and hydrated compounds varying according to some physical parameters of lanthanides and lanthanide malonates [6]; studies on double malonates (potassium rare earth malonates) K Ln(C H O ) of gadolinium to holmium and 5 3 2 4 4 yttrium [7]; study of thermal decomposition of transition metal malonates [8,9]. In this paper, the object of the present research was to prepare solid state compounds of heavy trivalent lanthanide ions (i.e.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and thermal behaviour of heavy trivalent lanthanide malonates

et al. 2010

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Solid-state Ln-L compounds, where Ln stands for heavy trivalent lanthanides (Tb-Lu) and L is malonate, have been synthesized. Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), X-ray powder diffractometry, infrared spectroscopy, TG-FTIR system, elemental analysis and complexometry were used to characterize and to study the thermal behaviour of these compounds. The dehydration of the compounds begins at 303 K and the anhydrous compounds are stable up to 548 K. The results also provided information concerning the ligand’s denticity, thermal behaviour and identification of some gaseous products evolved during the thermal decomposition of these compounds.

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Thermal behaviour of malonic acid, sodium malonate and its compounds with some bivalent transition metal ions

Cited by 43 publications

References 21 publications

Experimental Assessment and Modeling of the Solubility of Malonic Acid in Different Solvents

Experimental Assessment and Modeling of the Solubility of Malonic Acid in Different Solvents

Synthesis and fluorescence properties of 1,2,4‐triazolo[3,4‐b]‐1,3,4‐thiadiazol derivatives and their terbium complexes

Synthesis, characterization and thermal behaviour of heavy trivalent lanthanide malonates

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