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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Reverse saturable absorption in 5,10,15,20-Tetra(4-pyridyl)-21H,23H-porphyrin with ruthenium outlying complexes

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Author(s):
Newton M. Barbosa Neto [1] ; Samuel L. Oliveira [2] ; Ilde Guedes ; Luis R. Dinelli [4] ; Lino Misoguti [5] ; Cleber R. Mendonça [6] ; Alzir A. Batista [7] ; Sergio C. Zílio [8]
Total Authors: 8
Affiliation:
[1] Universidade Federal de Uberlândia. Instituto de Física - Brasil
[2] Universidade de São Paulo. Instituto de Física de São Carlos - Brasil
[4] Fundação Educacional de Barretos - Brasil
[5] Universidade de São Paulo. Instituto de Física de São Carlos - Brasil
[6] Universidade de São Paulo. Instituto de Física de São Carlos - Brasil
[7] Universidade Federal de São Carlos. Departamento de Química - Brasil
[8] Universidade de São Paulo. Instituto de Física de São Carlos - Brasil
Total Affiliations: 8
Document type: Journal article
Source: Journal of the Brazilian Chemical Society; v. 17, n. 7, p. 1377-1782, 2006-12-00.
Abstract

Investigations on the excited state absorption signal of 5,10,15,20-tetra(4-pyridyl)-21H,23H-porphyrin, modified by either changing the central ion or adding peripheral groups, were performed using 5 ns laser pulses at 532 nm, in association with linear absorbance and fluorescence decay time measurements. The reverse saturable absorption (RSA) increases remarkably when Zn2+ replaces H+ at the central position of the porphyrin ring. However, it decreases when RuCl2(CO)(PPh3)2 and RuCl2(CO)(dppb) groups are attached at outlying positions through the pyridine rings, for both the free base and zinc porphyrins. A theoretical model based on Jablonski diagram was used to verify the main reason for the decrease on the RSA signal caused by ruthenium groups. (AU)