Nanomolecular singlet oxygen photosensitizers based on hemiquinonoid-resorcinarenes, the fuchsonarenes

Daniel T. Payne, Whitney A. Webre, Habtom B. Gobeze, Sairaman Seetharaman, Yoshitaka Matsushita, Paul A. Karr, Mandeep K. Chahal, Jan Labuta, Wipakorn Jevasuwan, Naoki Fukata, John S. Fossey, Katsuhiko Ariga, Francis D'Souza, Jonathan P. Hill

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Abstract

Singlet oxygen sensitization involving a class of hemiquinonoid-substituted resorcinarenes prepared from the corresponding 3,5-di-t-butyl-4-hydroxyphenyl-substituted resorcinarenes is reported. Based on variation in the molecular structures, quantum yields comparable with that of the well-known photosensitizing compound meso-tetraphenylporphyrin were obtained for the octabenzyloxy-substituted double hemiquinonoid resorcinarene reported herein. The following classes of compounds were studied: benzyloxy-substituted resorcinarenes, acetyloxy-substituted resorcinarenes and acetyloxy-substituted pyrogallarenes. Single crystal X-ray crystallographic analyses revealed structural variations in the compounds with conformation (i.e., rctt, rccc, rcct) having some influence on the identity of hemiquinonoid product available. Multiplicity of hemiquinonoid group affects singlet oxygen quantum yield with those doubly substituted being more active than those containing a single hemiquinone. Compounds reported here lacking hemiquinonoid groups are inactive as photosensitizers. The term 'fuchsonarene' (fuchson + arene of resorcinarene) is proposed for use to classify the compounds.

Original languageEnglish
Pages (from-to)2614-2620
Number of pages7
JournalChemical Science
Volume11
Issue number10
Early online date18 Feb 2020
DOIs
Publication statusPublished - 14 Mar 2020

ASJC Scopus subject areas

  • Chemistry(all)

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