Dynamic solvent effects on the fading of a merocyanine formed from a spironaphthoxazine. A case of a strong coupling between chemical and medium coordinate

Literature Information

Publication Date 2004-03-22
DOI 10.1039/B316983A
Impact Factor 3.676
Authors

Hiroharu Kono, Hiroyuki Osako, Makoto Sasaki, Toru Takahashi, Yasushi Ohga, Tsutomu Asano, Michael Hildebrand, Noham N. Weinberg


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Abstract

The pressure dependence of the rate constant for the fading of a merocyanine formed from a spironaphthoxazine was measured in three pairs of nonviscous/viscous solvents of similar polarity, such as ethanol/2-methylpentane-2,4-diol, methyl acetate/glycerol triacetate, and methylcyclohexane/2,4-dicyclohexyl-2-methylpentane. The results unequivocally demonstrated a necessity to treat the medium and the chemical coordinate as two independent coordinates. These coordinates were found strongly coupled in the present reaction, especially in protic solvents. The results also revealed that hydrogen-bond solvation to the oxygen atom in the initial state and its desolvation during the activation step play important roles in both reaction mechanisms and dynamics.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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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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