Cruciforms as Functional Fluorophores:  Response to Protons and Selected Metal Ions

摘要: The photophysics of dialkylamino- and/or pyridine-containing functional chromophores, 1,4-distyryl-2,5-bis(ethynylaryl)benzenes (cruciforms) was investigated; their fluorescence quantum yields and emissive lifetimes were determined. Depending upon substituents, the frontier molecular orbitals (FMOs) these cruciforms are either congruent, i.e., HOMO LUMO occupy same real space, or disjoint, is located on one branch cruciform while second one. Donor−acceptor substitution leads to a disjoint FMO pattern, parent 1,4-distyryl-2,5-bis(phenylethynyl)benzene shows congruent FMOs. investigated addition an excess trifluoroacetic acid selected metal (Mg2+, Ca2+, Mn2+, Zn2+) trifluoromethanesulfonate salts. Addition ions protons led analogous but not identical changes in spectroscopic properties cruciforms. collected data...