Nonlinear properties of unfilled d shell metal porphyrins of 5,10,15,20-tetraphenyl-21H, 23H-porphine cobalt(II) et 5,10,15,20-tetrakis(4-methoxyphenyl)-21H, 23H-porphine cobalt(II) using D4 σ-Z-scan

Abstract

We study the nonlinear (NL) absorption and refraction of 5,10,15,20-tetraphenyl-21H, 23H-porphin cobalt(II) (CoTPP) and 5,10,15,20-tetrakis(4-methoxyphenyl)-21H, 23H-porphin cobalt(II) (MCoTPP). The measurements were carried out in solutions prepared with chlorobenzene applying the D4[Formula: see text]-Z-scan technique with a laser delivering single pulses in the picosecond regime at 532[Formula: see text]nm. For each compounds, the NL coefficients were measured for three concentrations. The results show that these materials with unfilled [Formula: see text] shell exhibit a saturable absorption (SA), where they have been compared to the basic structure tetraphenylporphyrin (TPP) and zinc tetraphenylporphyrin (ZnTPP) with filled [Formula: see text] shell metal in order to see the influence of the central metal ion on the NL absorption (NLA) behavior.