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

Journal of the Brazilian Chemical Society

Dinelli, Luis R.¹  Batista, Alzir A.¹  Barbosa Neto, Newton M.¹  Zílio, Sergio C.¹  Guedes, Ilde¹  Oliveira, Samuel L.¹  Universidade Federal de São Carlos, São Carlos, Brazil¹  Mendonça, Cleber R.¹  Universidade Federal do Ceará, Fortaleza, Brazil¹  Universidade de São Paulo, São Carlos, Brazil¹  Fundação Educacional de Barretos, Barretos, Brazil¹  Misoguti, Lino¹  Universidade Federal de Uberlândia, Uberlândia, Brazil¹ 

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

DOI  :  10.1590/S0103-50532006000700027

学科分类：化学（综合）

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】

Unknown