Donor-/Acceptor-Substituted Tetrakis(arylethynyl)benzenes: The Influence of Donor Group on Optoelectronic Properties.
We have prepared nine structural isomers of a tetrakis(arylethynyl)benzene chromophore functionalized with 4-butoxyphenyl and pyridyl units as the respective donor and acceptor units and examined their steady-state spectroscopic parameters to study how small structural variations effect the electronic absorption and emission spectra. Unlike their 4-dibutylaminophenyl congeners that exhibited dynamic hypsochromic or bathochromic shifts in response to Lewis and Brønsted acids, the current class of compounds simply showed quenched fluorescence upon protonation; only AlCl3 elicited a red-shifted fluorescence response. Computational studies of each system were also performed to provide additional insight into the energy levels and electronic transitions present.
['Nojo|Wataru|W|0000-0002-8783-3114', 'Reingold|I David|ID|', 'Bard|Jeremy P|JP|0000-0001-6135-0977', 'Chase|Daniel T|DT|0000-0002-4957-0261', 'Deng|Chun-Lin|CL|0000-0002-3192-9424', 'Haley|Michael M|MM|0000-0002-7027-4141']
chromophores fluorescence alkynes cross-coupling donor−acceptor compounds