Artículos de revistas
Picoline as ligand with antimony trichloride and triiodide adducts
Journal Of Thermal Analysis And Calorimetry. Kluwer Academic Publ, v. 75, n. 3, n. 975, n. 988, 2004.
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.753975988