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Issue 12, 2015
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Efficient screening of 2D molecular polymorphs at the solution–solid interface

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Abstract

Formation of multiple polymorphs during two-dimensional (2D) crystallization of organic molecules is more of a routine occurrence than rarity. Although such diverse crystalline structures provide exciting possibilities for studying crystal engineering in 2D, predicting the occurrence of polymorphs for a given building block is often non-trivial. Moreover, there is scarcity of methods that can experimentally verify the presence of such crystalline polymorphs in a straightforward fashion. Here we demonstrate a relatively simple experimental approach for screening of 2D polymorphs formed at the solution–solid interface. The strategy involves use of solution flow produced by contacting a piece of tissue paper to the sample to generate a lateral density gradient along the substrate surface. In situ generation of such gradient allows rapid discovery and nanoscale separation of multiple 2D polymorphs in a single experiment. The concept is demonstrated using three structurally different building blocks that differ in terms of intermolecular interactions responsible for 2D crystal formation. The method described here represents a powerful tool for efficient screening of 2D polymorphs formed at the solution–solid interface.

Graphical abstract: Efficient screening of 2D molecular polymorphs at the solution–solid interface

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Supplementary files

Article information


Submitted
17 Nov 2014
Accepted
14 Feb 2015
First published
27 Feb 2015

This article is Open Access

Nanoscale, 2015,7, 5344-5349
Article type
Paper
Author version available

Efficient screening of 2D molecular polymorphs at the solution–solid interface

S. Lee, J. Adisoejoso, Y. Fang, K. Tahara, Y. Tobe, K. S. Mali and S. De Feyter, Nanoscale, 2015, 7, 5344
DOI: 10.1039/C4NR06808D

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