Fig. 3: Solid state morphology and solution phase anion binding studies. | Nature Communications

Fig. 3: Solid state morphology and solution phase anion binding studies.

From: Formation of supramolecular channels by reversible unwinding-rewinding of bis(indole) double helix via ion coordination

Fig. 3

The globular self-assembled structure observed in FESEM (a), AFM (c), and TEM (e) microscopic technics by 1b. The multi-layer microsheets assembly captured in FESEM (b), AFM (d), and TEM (f) microscopic technics by 1b with TBACl. The morphology studies were performed by preparing the 150 μM solutions of 1b and [1b+Cl−] in acetonitrile/THF (1:1) solvent system. The stacked 1H NMR spectra of 1c (3.0 mM) in CDCl3 at room temperature upon titrating with increasing equivalents of TBACl representing the conversion of the double helix to the anion bound complex (g). The stacked 1H NMR spectra of compound 1c in CDCl3 upon the addition of 2 equivalents of TBABr, TBAI, and TBANO3 at room temperature (h). The stacked 1H NMR spectra of compound 1c in CDCl3 with the sequential addition of 2 equivalents of TBACl, and 2.5 equivalents of AgBF4 to monitor the reversible unwinding-rewinding process (i).

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