Journal article

Electronic spectroscopy and photophysics of calix[4]azulene

Amy L Stevens, Colleen Yeow, Jonathan M White, Siobhan J Bradley, Kenneth P Ghiggino, Ronald P Steer

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | ELSEVIER SCIENCE SA | Published : 2021

Abstract

Calix[4]azulene is a non-alternant aromatic calixarene composed of four azulene chromophores linked by methylene groups. Its photochemical stability, photophysical properties and an analysis of its electronic spectra are reported using monomeric azulene as a known reference standard. The molecule is stable when excited in its visible and near uv absorptions and, unlike azulene, produces no measurable “anti-Kasha” fluorescence when excited to its second excited singlet state, S2. This lack of fluorescence places the lifetime of the initially excited, photochemically stable S2 species at less than 1 picosecond. A significant, bathochromic shift of the S2 absorption band system in the calixaren..

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Grants

Awarded by ARC Centre of Excellence in Exciton Science


Funding Acknowledgements

ALS and RPS gratefully acknowledge the continuing financial support of the Natural Science and Engineering Research Council of Canada. Funding support from the ARC Centre of Excellence in Exciton Science (CE170100026) is also acknowledged. The authors thank Dr. Chris Hall for assistance with the transient absorption experiments.