Espectroscopia de lente térmica para a investigação da reação fotoquímica do composto ferrosotripiridina em meio aquoso

Abstract

In this work we presented an extension to Shen-Pedreira's model for thermal lens spectroscopy technique to study the dynamical processes of photochemical reaction. The aim of this work is show that the thermal lens spectroscopy could be used for the qualitative analysis of the photochemical reactions. In addition, we showed that the use of two different wavelengths for the excitation laser is a possible additional tool for determinate the presence of the photochemical reaction. We applied this dual-wavelength on/off excitation thermal lens approach to identify and quantify the photochemical behavior of the [Fe(TPTZ)2]+2 solution as a function the pH. We verify that the addition of chloride acid (HCl) in the solution reduced the activation barrier followed the Arrhenius correlation. Our results suggest that the dual-wavelength on-off Thermal lens technique may be contributed to the understanding of dynamics photo induced processes in complexes reaction.