Emission spectroscopic properties of water soluble porphyrins in hydrogen peroxide chemiluminescence system with d- and f-electron metals

摘要

Two water-soluble porphyrins: 4,4',4",14'''-(porphine-5,10,15,20-tetrayl)-tetrakis (benzoic acid) (TCPPH2) and 4,4,4",4'''-(porphine-5,10,15,20-tetrayl)-tetrakis (benzenesulfonic acid) (TSPPH2) have been subjected to spectroscopic study in the presence of d-electron metals: Zn(II) and Cu(II) and f-electron metals: La(III), Eu(III), Gd(III) and Yb(III). Results of the spectrophotometric study have provided evidence proving the complexation of Cu(II) and Zn(II) cations by porphine in water solutions and the complexation of lanthanide ions exclusively by peripheral carboxyl and sulfonic groups. For the first time, chemiluminescence of the systems containing porphyrins has been measured without the use of strongly luminescent reagents such as TCPO or luminol. The emission spectra of the systems porphyrin/metal ion/H2O2 have been recorded and the quantum yield of their luminescence has been measured. The absorption spectra of the systems recorded before and after the reaction in the presence of hydrogen peroxide are identical, which means that the porphyrin ring does not undergo destruction. A significant similarity between the fluorescence and chemiluminescence spectra indicates a possibility of excitation of porphyrins and their complexes in the reaction with hydrogen peroxide. (C) 2002 Elsevier Science (USA). All rights reserved. [References: 16]