- Combined reversible switching of ECD and quenching of CPL with chiral fluorescent macrocycles
Homberg, A.; Brun, E.; Zinna, F.; Pascal, S.; Górecki, M.; Monnier, L.; Besnard, C.; Pescitelli, G.; Di Bari, L.; Lacour, J.
Chem. Sci. 2018, 9, 7043-7052
Straightforward synthesis and resolution of a series of chiral fluorescent macrocycles are presented, together with their electronic circular dichroism (ECD), strong excimer fluorescence (EF, λ 300 to 650 nm) and allied highly circularly polarized luminescence (CPL, glum up to 1.7×10-2). The ECD, EF and CPL responses are strongly affected by the presence of metal ions (Na+, Ba2+) thanks to deep conformational changes. While ECD signals can be almost completely reversibly inverted upon the complexation/decomplexation of metal ions in a typical binary response, CPL signals are reversibly quenched concomitantly. The designed macrocycles display thus a remarkable combination of both +/− ECD and on/off CPL reversible switching.
DOI : 10.1039/C8SC02935K
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