How deprotonation changes molecular self-assembly - an AFM study in liquid environment

Schreiber M, Eckardt M, Klassen S, Adam H, Nalbach M, Greifenstein L, Kling F, Kittelmann M, Bechstein R, Kühnle A (2013)
Soft Matter 9(29): 7145-7149.

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We study the influence of Alizarin Red S deprotonation on molecular self-assembly at the solid-liquid interface of the natural cleavage plane of calcite immersed in aqueous solution. To elucidate the adsorption details, we perform pH dependent high-resolution atomic force microscopy measurements. When Alizarin Red S is deposited onto calcite(10.4) in a liquid environment at an acidic pH of 5, weakly bound, ordered islands with a (3 x 3) superstructure are observed. A sharp structural transition is revealed when increasing the pH above 8. Above this pH, stable needle-like structures oriented along the [01.0] direction form on the surface. Comparing these results with potentiometric titration data allows for unambiguously assigning the two molecular structures to the single and two-fold deprotonated moieties of Alizarin Red S. Our work, thus, illustrates the decisive impact of the protonation state on molecular self-assembly.
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Schreiber M, Eckardt M, Klassen S, et al. How deprotonation changes molecular self-assembly - an AFM study in liquid environment. Soft Matter. 2013;9(29):7145-7149.
Schreiber, M., Eckardt, M., Klassen, S., Adam, H., Nalbach, M., Greifenstein, L., Kling, F., et al. (2013). How deprotonation changes molecular self-assembly - an AFM study in liquid environment. Soft Matter, 9(29), 7145-7149. doi:10.1039/c3sm50262g
Schreiber, M., Eckardt, M., Klassen, S., Adam, H., Nalbach, M., Greifenstein, L., Kling, F., Kittelmann, M., Bechstein, R., and Kühnle, A. (2013). How deprotonation changes molecular self-assembly - an AFM study in liquid environment. Soft Matter 9, 7145-7149.
Schreiber, M., et al., 2013. How deprotonation changes molecular self-assembly - an AFM study in liquid environment. Soft Matter, 9(29), p 7145-7149.
M. Schreiber, et al., “How deprotonation changes molecular self-assembly - an AFM study in liquid environment”, Soft Matter, vol. 9, 2013, pp. 7145-7149.
Schreiber, M., Eckardt, M., Klassen, S., Adam, H., Nalbach, M., Greifenstein, L., Kling, F., Kittelmann, M., Bechstein, R., Kühnle, A.: How deprotonation changes molecular self-assembly - an AFM study in liquid environment. Soft Matter. 9, 7145-7149 (2013).
Schreiber, Martin, Eckardt, Michael, Klassen, Stefanie, Adam, Holger, Nalbach, Martin, Greifenstein, Lukas, Kling, Felix, Kittelmann, Markus, Bechstein, Ralf, and Kühnle, Angelika. “How deprotonation changes molecular self-assembly - an AFM study in liquid environment”. Soft Matter 9.29 (2013): 7145-7149.
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