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Abstract
The preparation, characterization and thermal behavior of Mn(II)-diclofenac solid-state complex was investigated by simultaneous TG/DTA and DTG curves, DSC, X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) techniques. The thermal evaluation was carried out with sample masses of 2 and 5 mg, with the purpose of comparing the values of activation energy regarding dehydration, monotropic phase transition and thermal decomposition in both samples mass. The DSC curves were obtained in opened and with crimped lids crucibles of aluminum under oxygen purge gas and static air (without purge gas). The DTA and DSC curves show an exothermic peak between 150-180 °C depending on heating rate, which can be attributed to the monotropic non-reversible reaction. The activation energy (Ea/kJ mol-1) to dehydration, the monotropic phase transition and the first thermal decomposition step were determined by Capela-Ribeiro nonlinear isoconversional method. The activation energy under oxygen dynamic purge gas shows lower values compared to those obtained under static air.
Highlights
The diclofenac (2-[2,6-dichlorophenylamino]phenylacetate) is a pharmaceutical drug that can be used as a chemical ligand and has the coordinating ability for complexing several metal ions due to its carboxyl group
The thermal behavior of Mn(II)-diclofenac complex was studied with two sample masses as well as it was established the stoichiometry of this complex as Mn(Diclof)[2].H2O
The thermal evaluation shows steps regarding dehydration, monotropic phase transition, and decomposition which could be evaluated from activation energy values
Summary
Dichlorophenylamino]phenylacetate) is a pharmaceutical drug that can be used as a chemical ligand and has the coordinating ability for complexing several metal ions due to its carboxyl group. The studies of the stable metal complex can be used for different purposes, such as the obtaining metallic oxides to advanced materials (ceramics, glasses, among others) or to obtain new properties of application in biological functions[1,2,3,4]. The thermogravimetry is a valuable technique for studying the thermal behavior of solid-state compounds of metal complexes, which are essential to synthesize complexes in the desired stoichiometry in several applications. The activation energy of dehydration has the similar behavior, but the first and second thermal decomposition stages showed several values of activation energy[5]. Compounds of aluminum and indium (III)[6]
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