Artículos de revistas
Picoline as ligand with antimony trichloride and triiodide adducts
Registration in:
Journal Of Thermal Analysis And Calorimetry. Kluwer Academic Publ, v. 75, n. 3, n. 975, n. 988, 2004.
1388-6150
WOS:000220510700025
10.1023/B:JTAN.0000027191.45965.f7
Author
Pontes, FML
Oliveira, SF
Espinola, JGP
Arakaki, LNH
Fonseca, MG
Airoldi, C
Institutions
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;γ-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;β-pic<SbCl3.gamma-pic and iv) SbI3.beta-pic<SbI3&BULL;α-pic&CONG;SbI3&BULL;γ-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. 75 3 975 988