As for the excited-state geometry planarization, the most typical case is twisted-to-planar, which results from the rotation of the aryl rings around the C−C (or C−N) single bond as in the initially twisted biphenyls and biaryls.
As for the excited-state geometry planarization, the most typical case is twisted-to-planar, which results from the rotation of the aryl rings around the C−C (or C−N) single bond as in the initially twisted biphenyls and biaryls.<br>