All‐Optical Fine‐Tuning of Absorption Band of Diarylethene with Photochromic Acid‐Generating Spiropyran

By taking advantage of pKa difference for the isomers of a spiropyran (MC and SP), a continuous and reversible shift of the absorption band of the closed form of diarylethene (C) for 30 nm is successfully realized only by light irradiation and thermal treatment, i.e., without the addition of any chemical species or the application of any physical contact. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.