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

Journal of the Brazilian Chemical Society

Newton M. Barbosa Neto²  Samuel L. Oliveira¹  Ilde Guedes¹  Luis R. Dinelli¹  Lino Misoguti¹  Cleber R. Mendonça¹  Alzir A. Batista¹  Sergio C. Zílio¹ 

[1] ,Universidade Federal de Uberlândia Instituto de Física Uberlândia MG ,Brazil

关键词: porphyrins;    ruthenium complexes;    optical properties;    reverse saturable absorption;   

DOI  :  10.1590/S0103-50532006000700027

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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