コロネンとは
コロネンの吸収帯
inspirehep.net/record/1249579/plots
Abstract
The first rational synthesis of a BN-doped coronene derivative in which the central benzene ring has been replaced by a borazine core is described.
This includes six C−C ring-closure steps that, through intramolecular Friedel–Crafts-type reactions, allow the stepwise planarization of the hexaarylborazine precursor.
UV/Vis absorption, emission, and electrochemical investigations show that the introduction of thecentral BN coreinduces a dramatic widening of the HOMO–LUMO gap and an enhancement of the blue-shifted emissive properties with respect to its all-carbon congener.
nature.com/articles/ncomms11555
Differing perspectives of both unit cells (blue boxes) viewed slightly offset from along the a-axis (a and c) and along the b-axis (b and d). The relative shift of the molecules along the stacks are shown for β- (e) and γ- (f). (g) and (h) show an orientation of the unit cell clearly demonstrating the difference in nearest neighbour angle between the two polymorphs. Red green and black arrows indicate the direction of the a-, b- and c-axis respectively.
Figure 1: Optical images of the β- and γ- polymorphs of coronene.
(a) in daylight and (b) under ultraviolet (λ=365 nm) illumination to show fluorescence. The squares on the grid in a are 0.5 × 0.5 cm2.