Decisive Factors in the Photoisomerization Behavior of Crowned Spirobenzopyrans: Metal Ion Interaction with Crown Ether and Phenolate Anion Moieties

✍ Scribed by Abdussalam M. A. Salhin; Mutsuo Tanaka; Kenji Kamada; Hisanori Ando; Tomokazu Ikeda; Yasuhiko Shibutani; Setsuko Yajima; Makoto Nakamura; Keiichi Kimura

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 384 KB
• Volume: 2002
• Category: Article
• ISSN: 1434-193X
• DOI: 10.1002/1099-0690(200202)2002:4<655::aid-ejoc655>3.0.co;2-6

✦ Synopsis

The influence of metal ion interaction with crowned spirobenzopyrans on the photoisomerization behavior was investigated through the use of various solvents, crowned spirobenzopyrans, and metal ions. Studies on the photoisomerization behavior of crowned spirobenzopyrans in various solvents revealed that solvation of the phenolate anion moiety in the merocyanine form induced photoisomerization back to the spiropyran form, giving rise to negative photochromism. Metal ion interaction with the phenolate anion moiety similarly caused photoisomerization back to the spiropyran form,