Synthesis of Macrocyclic Receptors with Intrinsic Fluorescence Featuring Quinizarin Moieties
摘要:
Au unprecedented class of macro cycles with intrinsic fluorescence consisting of phenolic triers and quinizarin is developed: Though they are lathing strong hydrogen bonds as observed in calixarenes, the two examples introduced here each adopt a vase-like conformation with all four aromatic units pointing in one direction (syn orientation). This "cone" conformation has been confirmed by NMR spectroscopy, molecular modeling, and X-ray crystallography. The laminar, electron-rich fluorophore as part of the macrocycle allows additional contacts to enclosed guest molecules.