The photoexcited triplet state of free-base porphycene: a time-resolved EPR and electron spin echo investigation

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DOI 10.1039/A903382C
Impact Factor 3.676
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Abstract

The photoexcited triplet state of free-base porphycene randomly oriented in a glassy toluene matrix has been investigated by time-resolved electron paramagnetic resonance and electron spin echo spectroscopy over the temperature range 4–100 K. Spectral broadening and anisotropic relaxation are both observed as the temperature is raised, demonstrating the complementary use of these techniques. It is concluded that two triplet states are present in the EPR spectra: only one at 4 K, and the other becoming populated at higher temperatures. This behaviour is explained in terms of intramolecular N–H tautomerism in the porphycene macrocycle. The N–H tautomerism is estimated to have a maximum rate of 7×108 s-1 at 100 K.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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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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