Excited state quenching kinetics of zinc meso-tetrakis (N-methylpyridinium-4-yl) porphyrin by methyl viologen in AOT reverse micelles
文献信息
Denisio M. Togashi, Sílvia M. B. Costa
The singlet and triplet excited state quenching of Zn (II) meso-tetrakis (N-methylpyridinum-4-yl) porphyrin (ZnTMPyP4+) by methyl viologen (Mv2+) in AOT reverse micelles has been studied using steady state fluorescence and laser flash photolysis techniques. The water content in the reverse micelle was varied by using different values of W0 = [H2O]/[AOT] at fixed AOT (0.1 M) concentration and the quenching process efficiency was found to decrease with increasing W0. The ZnTMPyP4+ triplet state is strongly quenched by Mv2+ and the probe decay profiles were nonexponential. Data analysis with an active sites quenching model gave aggregation numbers which compare well with the literature values reported for the AOT reverse micelles. The rate constants for the quenching of singlet and triplet excited states correlate with the micelle size and were found to decrease with increasing micellar radii giving evidence of a geometrical confinement effect. The magnitudes of the rate constants are of the order of diffusion controlled reactions affected by electrostatic interactions between charged species in the interfacial micellar region.
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.
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