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

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

Content Provider	Semantic Scholar
Author	Schreiber, Martin Eckardt, Michael Klassen, Stefanie Adam, Holger Nalbach, Martin Greifenstein, Lukas Kling, Felix Kittelmann, Markus Bechstein, Ralf Kühnle, Angelika
Copyright Year	2013
Abstract	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 × 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.
Starting Page	7145
Ending Page	7149
Page Count	5
File Format	PDF HTM / HTML
DOI	10.1039/C3SM50262G
Volume Number	9
Alternate Webpage(s)	https://pub.uni-bielefeld.de/download/2913808/2930784/SoftMatter_9_2013_Schreiber.pdf
Alternate Webpage(s)	https://doi.org/10.1039/C3SM50262G
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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