Influence of chemical substitution and electronic effects on the triplet state kinetics of xanthene dyes
文献信息
Intersystem crossing rate constants and triplet lifetimes of structurally related xanthene dyes in air-equilibrated ethylene glycol are presented. By using a new time-resolved laser-scanning-microscopy technique the results are obtained with high accuracy. The relationship between the triplet quantum yield and the molecular structure is investigated. Electron withdrawing substituents yield a decrease of the intersystem crossing rate constant. This result is obtained for all investigated amino-group substitution patterns of the xanthene dyes. The introduction of additional branching of the chromophoric system causes an enhancement of the intersystem crossing rate constant by more than a factor of 2. These results cannot be explained by the energy gap rule. The triplet lifetime is in the range of a few microseconds and increases with the relative molecular mass of the dye.
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Physical Chemistry Chemical Physics

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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