Yukio Yamamoto, Toshiya Okajima, Yoshimasa Fukazawa, Tomomi Fujii, Yasuo Hata and Seiji Sawada
Two stable conformations of a fluorescent rotor have been estimated by a variable temperature 1H NMR study, including NOE measurement. The height of energy barrier between them is also assessed and confirmed by MO calculation and X-ray crystal structure.