Synthesis, characterization, and thermodynamic properties of the rare earth coordination complex [Sm(C6H4NO2)2·C9H6NO] / Hui-Wen Gu in Industrial & engineering chemistry research, Vol. 51 N° 13 (Avril 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 4797–4803 Titre : Synthesis, characterization, and thermodynamic properties of the rare earth coordination complex [Sm(C6H4NO2)2·C9H6NO] Type de document : texte imprimé Auteurs : Hui-Wen Gu, Auteur ; Sheng-Xiong Xiao, Auteur ; Hang-Ying Xiao, Auteur Année de publication : 2012 Article en page(s) : pp. 4797–4803 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Thermodynamic properties Résumé : This article reports the synthesis and thermodynamic properties of a novel rare earth coordination complex, samarium chloride hexahydrate (SmCl3·6H2O) with nicotinic acid (C6H5NO2) and 8-hydroxylquinoline (C9H7NO), whose composition and structure were characterized by elemental analysis, molar conductance, thermogravimetric analysis (TG–DTG), UV spectroscopy, IR spectroscopy, and X-ray powder diffraction. During the process of coordination, C6H5NO2 was bidentate-coordinated with the rare earth ion (Sm3+) through an acidic group that was formed by removing the proton; the hydroxyl oxygen atom and heterocyclic nitrogen atom of C9H6NO– formed a chelate ring with Sm3+ for coordination. The X-ray powder diffraction pattern demonstrated that the crystal type of [Sm(C6H4NO2)2·C9H6NO] is similar to that of C5H11NO2, with the cell parameters a = 5.426 nm, b = 22.105 nm, and c = 5.277 nm. At a constant temperature of 298.15 K, the dissolution enthalpies of the reactants and products of the coordination reaction in the optimized calorimetric solvent were determined with an advanced solution–reaction isoperibol microcalorimeter. The standard molar enthalpy change of the coordination reaction was determined to be ΔrHmΘ = (167.49 ± 0.39) kJ·mol–1. The standard molar enthalpy of formation of the title complex, [Sm(C6H4NO2)2·C9H6NO], was estimated to be ΔfHmΘ[Sm(C6H4NO2)2·C9H6NO(s), 298.15 K] = −(1483.4 ± 2.4) kJ·mol–1, from a combination of the experimental values of enthalpies of dissolution and some other auxiliary thermodynamic data through a designed thermochemical cycle based on a supposed chemical reaction. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202891s [article] Synthesis, characterization, and thermodynamic properties of the rare earth coordination complex [Sm(C6H4NO2)2·C9H6NO] [texte imprimé] / Hui-Wen Gu, Auteur ; Sheng-Xiong Xiao, Auteur ; Hang-Ying Xiao, Auteur . - 2012 . - pp. 4797–4803. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 4797–4803 Mots-clés : Thermodynamic properties Résumé : This article reports the synthesis and thermodynamic properties of a novel rare earth coordination complex, samarium chloride hexahydrate (SmCl3·6H2O) with nicotinic acid (C6H5NO2) and 8-hydroxylquinoline (C9H7NO), whose composition and structure were characterized by elemental analysis, molar conductance, thermogravimetric analysis (TG–DTG), UV spectroscopy, IR spectroscopy, and X-ray powder diffraction. During the process of coordination, C6H5NO2 was bidentate-coordinated with the rare earth ion (Sm3+) through an acidic group that was formed by removing the proton; the hydroxyl oxygen atom and heterocyclic nitrogen atom of C9H6NO– formed a chelate ring with Sm3+ for coordination. The X-ray powder diffraction pattern demonstrated that the crystal type of [Sm(C6H4NO2)2·C9H6NO] is similar to that of C5H11NO2, with the cell parameters a = 5.426 nm, b = 22.105 nm, and c = 5.277 nm. At a constant temperature of 298.15 K, the dissolution enthalpies of the reactants and products of the coordination reaction in the optimized calorimetric solvent were determined with an advanced solution–reaction isoperibol microcalorimeter. The standard molar enthalpy change of the coordination reaction was determined to be ΔrHmΘ = (167.49 ± 0.39) kJ·mol–1. The standard molar enthalpy of formation of the title complex, [Sm(C6H4NO2)2·C9H6NO], was estimated to be ΔfHmΘ[Sm(C6H4NO2)2·C9H6NO(s), 298.15 K] = −(1483.4 ± 2.4) kJ·mol–1, from a combination of the experimental values of enthalpies of dissolution and some other auxiliary thermodynamic data through a designed thermochemical cycle based on a supposed chemical reaction. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202891s

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