Observation of Photophysical Processes of a Heptacene Derivative: Monomeric Behavior in Homogeneous Solution and Singlet Fission in Thin Film - Shinjiro Suzuki; Hayato Sakai; Mitsuaki Yamauchi; Hironobu Hayashi; Yoshiyuki Mizuhata; Tatsuhisa Kato; Takashi Hirose; Taku Hasobe; Hiroko Yamada (Journal of the American Chemical Society, 2026)