Absorption Spectra of Some Substituted Benzoquinones

Electronic communication across N-linked unconjugated polymers: important insight into the charge transfer processes of polyaniline

“…21 and 65.11 between the average M and phenyl planes for 9, indicate that the N lone pair is conjugated with M and very weakly with both neighbouring phenyls. The cyclic voltammograms, CV, exhibit a similar trace with an irreversible oxidation wave at 0.74 (1), 0.77 (7), 0.90 (2) and 0.90 (12) V vs. Ag/Ag + (ESI †), which resemble that for trans-Pt(PEt 3 ) 2 (CRCC 6 H 5 ) 2 (benzene/ACN, E ox B 1.2 V vs. Ag/AgCl). 6 These data confirm absence of conjugation along the full chain (since the peak potentials between the monomers and their polymers are similar), and the poorer acceptor properties of M than that for Q (since the peak potentials for the Q-containing species are at lower positive potentials).…”

“…The UV-vis spectra of 1, 2, 7, and 12 exhibit features at l > 400 nm with large absorptivity values (Fig. 2A, e > 10 000 M À1 cm À1 , see details in the ESI †) that are absent in structurally related compounds containing the same central core (2,5-bis(methylamino)benzoquinone 7 and 2-amino-N-phenylmaleimide) 8 hence suggesting the presence of CT through N in 1 and 2.…”

Solvent-Driven Chirality Switching of a Pillar[4]arene[1]quinone Having a Chiral Amine-Substituted Quinone Subunit

“…Despite the CD signals at 310 nm, new Cotton effects appeared in the region of 300–400 nm of 1a and 2a , which could be ascribed to the transition of 2,5-bis(alkyl/arylamino)-1,4-benzoquinones ( Martini and Nachod, 1951 ; Li et al, 2020 ). In addition, strong Cotton effects in CT transition in the wavelength region of 400–700 nm were observed ( Wang H. J. et al, 2020 ).…”