Modern physical methods prove that the diphenyl ring is in the same plane, each carbon atom is sp2 hybrid, and the p orbitals of all carbon atoms are parallel to each other and overlap to form a closed conjugated system. Unlike the benzene ring, the overlap of the p orbitals of the ...
The difference in the transition dipole moments is assumed to be due to the difference in the contributions of the C-H bonds of the cyclopentane fragment to the formation of frontier molecular orbitals (Suppl. Section S3). An increase in the intensity of the n–𝜋π* transition in the 4...