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.
References
Issa, R. M., Gaber, M.,Al-Wakiel, N. A., Fathalla, S. K.,Synthesis, Spectral, Thermal and Biological Studies of Mn(II), Co(II), Ni(II) and Cu(II) Complexes with 1-(((5-Mercapto-1H-1,2,4-triazol-3-yl)imino)-methyl)naphthalene-2-ol,Chin. J. Chem. 30 (2012) 547-557. https://doi.org/10.1002/cjoc.201280004
EL-Ghamry, H. A., Sakai, K., Masaoka S, El-Baradie, K.Y., Issa, R. M., Preparation, Characterization, Biological Activity and 3D Molecular Modeling of Mn(II), Co(II), Ni(II), Cu(II), Pd(II) and Ru(III) Complexes of Some Sulfadrug Schiff Bases,Chin. J. Chem. 30 (2012) 881-890. https://doi.org/10.1002/cjoc.201280024
Khalaji, A. D., Rad, S. M., Grivani, G., Rezaei, M., Gotoh, K., Ishida, H.,Cobalt(III) Complex [CoL3] Derived from an Asymmetric Bidentate Schiff Base Ligand L (L=(5-Bromo-2-hydroxybenzyl-2-furylmethyl)-imine): Synthesis, Characterization and Crystal Structure,Chin. J. Chem. 29 (2011) 1613-1622. https://doi.org/10.1002/cjoc.201190241
Cong, C. J., Hong, J. H.,Luo, S. T., Tao, H. B., Zhang, K. L., Kinetics of Thermal Decomposition of Zn1–xMnxC2O4·2H2O in Air,Chin.J. Chem. 24 (2006) 499-503. https://doi.org/10.1002/cjoc.200690096
Kobelnik, M.,Cassimiro, D. L., Dias,D. S., Ribeiro, C. A.,Crespi,M. S.,Thermal Behavior of Sr(II) and Ba(II)-Diclofenac Complexes in Solid State: Study of the Dehydration and Thermal Decomposition, J. Chin. Chem. 29 (2011) 2271-2277. https://doi.org/10.1002/cjoc.201180391
Kobelnik, M.,Cassimiro, D. L., Almeida, A. E., Ribeiro, C. A.,Crespi, M. S.,Study of the thermal behavior of Al(III) and In(III)-diclofenac complexes in solid state, J. Therm. Anal. Cal. 105 (2011) 415-419. https://doi.org/10.1007/s10973-010-1266-y
Kobelnik, M.,Ribeiro, C. A., Dias, D. S., Almeida, S., Crespi, M. S., Capela, J. M. V.,Study of the thermal behavior of the transition phase of Co(II)–diclofenac compound by non-isothermal method, J. Therm. Anal. Cal. 105 (2011) 467-471. https://doi.org/10.1007/s10973-010-1208-8
Cassimiro, D. L., Ribeiro, C. A., Capela, J. M. V., Marisa S. Crespi, M. S., Capela, M. V., Kinetic parameters for thermal decomposition of supramolecular polymers derived from flunixin-meglumine adducts, J. Therm.Anal. Calorim. 105 (2011) 405–410. https://doi.org/10.1007/s10973-010-1116-y
Capela, J. M. V.,Capela, M. V.,Ribeiro, C. A., Rational approximations of the Arrhenius integral using Jacobi fractions and gaussian quadrature, J. Mathem. Chem. 45 (2009) 769–775. https://doi.org/10.1007/s10910-008-9381-8
Vyazovkin. S., Chrissafis, K., Di Lorenzo, M. L., Koga, N., Pijolat, M., Roduitf, B., Sbirrazzuoli, N., Suñol, J. J., ICTAC Kinetics Committee recommendations for collecting experimental thermal analysis data for kinetic computations, Therm. Acta. 590 (2014) 1-23. https:/doi.org/10.1016/j.tca.2014.05.036
Kobelnilk, M., Fontanari, G. G., Cassimiro, D. L., Ribeiro, C. A., Crespi, M. S., Thermal behavior of coffee oil (Robusta and Arabica species), J. Therm.Anal. Calorim. 115 (2014) 2045–2052. https://doi.org/10.1007/s10973-013-3150-z
Kobelnik, M., Cassimiro, D., Santos Dias, D. dos, Ribeiro, C. A., Crespi, M. S.,Thermal behavior of araça oil (Psidium cattleianum Sabine), J.Therm. Anal. Calorim. 108 (2012) 1281-1286. https://doi.org/10.1007/s10973-011-1700-9

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