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Updated: Aug 11, 2025

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes
Published on: April 1, 2013
Solvent-dependent fluorescence behaviour of imide-fused [n]phenacenes (n = 3, 5, 7)
Keito Nose1, Kaito Yoshioka1, Minoru Yamaji2
1Division of Molecular Sciences, Graduate School of Natural Science and Technology, Okayama University Okayama 700-8530 Japan hokamoto@okayama-u.ac.jp.
Abstract:
Imide-fused [n]phenacenes (nPDIs, n = 3, 5, 7) were systematically synthesised and their electronic features were investigated by electrochemical and electronic spectral measurements. nPDIs showed two reduction waves attributed to formation of radical ions and dianions. 3PDI produced blue fluorescence independent of solvent polarity. In contrast, 5PDI and 7PDI displayed marked positive solvatofluorochromism due to intramolecular charge transfer characters between the imide moieties and phenacene π cores in the excited state. The spectral features were analyzed by the Lippert-Mataga relationship and theoretical calculations.
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