Photocontrol of Anion Binding Affinity to a Bis-urea Receptor Derived from Stiff-Stilbene
Toward the development of photoresponsive anion receptors, a stiff-stilbene photoswitch has been equipped with two urea anion-binding motifs. Photoinduced E / Z isomerization has been studied in detail by UV–vis and NMR spectroscopy. Titration experiments ( 1 H NMR) reveal strong binding of acetate and phosphate to the ( Z )-isomer, in which the urea groups are closely together. Isomerization to the ( E )-form separates the urea motifs, resulting in much weaker binding. Additionally, geometry optimizations by density functional theory (DFT) illustrate that oxo-anion binding to the ( Z )-form involves four hydrogen bonds. Graphic Abstract ACS Electronic Supporting Info
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