Benzobisimidazole cruciform fluorophores.
A series of 11 cross-conjugated cruciform fluorophores based on a benzobisimidazole nucleus has been synthesized and characterized. Like in their previously reported benzobisoxazole counterparts, the HOMOs of these new fluorophores are localized along the vertical bisethynylbenzene axes, while their LUMOs remain relatively delocalized across the molecule, except in cruciforms substituted with electron-withdrawing groups along the vertical axis. Benzobisimidazole cruciforms exhibit a pronounced response to deprotonation in their UV/vis absorption and emission spectra, but their response to protonation is significantly attenuated.
Department of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, United States.
Ha T M
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Department of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, United States.
Nadia S
NS
El-Hamdi
Department of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, United States.
Ognjen Š
OŠ
Miljanić