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Type: Artigo de periódico
Title: Picoline as ligand with antimony trichloride and triiodide adducts
Author: Pontes, FML
Oliveira, SF
Espinola, JGP
Arakaki, LNH
Fonseca, MG
Airoldi, C
Abstract: Solid adducts SbX3.L-pic (X=Cl, I and L=alpha-, beta- and gamma-picolines) were synthesized and characterized by elemental analysis, H-1 and C-13 NMR, IR spectroscopy and thermal analysis. ne infrared spectroscopy and the magnetic resonance for H-1 and C-13 nuclei of these compounds suggest that the ligands coordinate through nitrogen atom. Kinetic studies were accomplished by means of thermogravimetric data, through isothermal and non-isothermal techniques. The best adjusting models for adducts thermal decomposition were R-1 for isothermal and R-1 and R-2 for the non-isothermal methods. The energy of activation values obtained by isothermal method indicate the following orders of thermal stability for adducts: i) SbCl3.alpha-pic>SbCl3.beta-pic>SbCl3.gamma-pic and ii) SbI3.beta-pic<SbI3&BULL;&gamma;-pic<SbI3.alpha-pic. The activation energy values obtained by non-isothermal were higher than those from isothermal methods, showing the order of stability: iii) SbCl3.alpha-pic<SbCl3&BULL;&beta;-pic<SbCl3.gamma-pic and iv) SbI3.beta-pic<SbI3&BULL;&alpha;-pic&CONG;SbI3&BULL;&gamma;-pic. These obtained data through R, model presented the kinetic compensation effect for trichloride adducts, which could be associated to both isothermal and non-isothermal processes.
Subject: antimony halide
alpha-, beta- and gamma-picolines
Country: Holanda
Editor: Kluwer Academic Publ
Citation: Journal Of Thermal Analysis And Calorimetry. Kluwer Academic Publ, v. 75, n. 3, n. 975, n. 988, 2004.
Rights: fechado
Identifier DOI: 10.1023/B:JTAN.0000027191.45965.f7
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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