期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 23, 期 7, 页码 1667-1675出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201604875
关键词
cyclophanes; dyes/pigments; host-guest chemistry; perylene bisimides; self-encapsulation
资金
- DFG in the framework of the research training group at the Universitat Wurzburg [FOR 1809]
Binding of guest molecules with high affinity and selectivity requires well-designed hosts to provide optimized interactions in the host-guest complexes. Herein we report the design and synthesis of new cyclophanes 2PBI((2,6-iPr)2) and 2PBI((2,6-Ph)2) based on core-disubstituted perylene bisimide ( PBI) chromophores bearing two phenoxy bay-substituents that evoke almost planar PBI scaffolds. This strategy afforded the new cyclophanes with conformationally rigid cavities to ensure strong binding to stiff planar polycyclic aromatic hydrocarbons ( PAHs). Our detailed host-guest binding studies with different PAHs by UV/Vis and fluorescence titration ex-periments revealed record binding strengths for PAHs with binding constants of up to 1.6 x 10(6) m(-1) in chloroform at room temperature. One-and two-dimensional NMR experiments and solvent-dependent titration studies revealed selfencapsulation of the side arms of PBI bay-substituents into the cavities that attained high fluorescence quantum yields of these cyclophanes close to unity by preventing the interaction of PBI subunits in the excited states. The binding constants and Gibbs free energies of host-guest complexations disclosed significant effects of PBI bay-substituents and core twist on the binding affinity of the cyclophanes.
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