Study of the Suppression of Porphyrin Emission upon Addition of Rare Earth Ions
作者： Osvaldo A. Serra , Cláudio R. Neri , Yassuko Iamamoto , Eduardo J. Nassar , Paulo S. Calefi
关键词: Band gap 、 Ion 、 Intersystem crossing 、 Chemistry 、 Luminescence 、 Radiative transfer 、 Photochemistry 、 Porphyrin 、 Substituent 、 Atom
摘要: A topic of constant investigation in recent decades has been the study electron and/or energy transfer reactions supramolecular systems. The between donor-acceptor depends on influence substituent intersystem crossing. competition radiative and non-radiative processes also other factors such as temperature, solvent gap. In this work, we have studied suppression emission monocarboxyphenyl porphyrins after addition rare earth ions (RE(III)). porphyrin decreases with RE(III), no matter which ion is present. When Eu(III) was used, not observed either. This happens due to effect heavy atom through electronic levels RE(III). After lifetime for MCTPPH2 started decay biexponentially, indicating formation a new species (MCTPPH2-RE(III)) shorter lifetime. presence NO2 groups ortho mesoaryl positions MCTNPPH2 Zn(II) Zn(MCTPP) decreased both an increase spin-orbit coupling.
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