Published in
American Chemical Society, Crystal Growth and Design, 2(14), p. 397-400, 2013
DOI: 10.1021/cg401639g
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Single-Stranded Molecular Helical Assembly from a Self-Complementary Squaramide Compound
Journal article published in 2013 by
Anna Portell,
Rafel Prohens 
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Abstract
A new helical crystal structure of a disquaramide compound has been solved by means of direct methods from powder X-ray diffraction data. It contains a racemic mixture of alternating clock/anticlockwise rotating helices which are formed through an unprecedented combination of strong squaramide–squaramide and amine–phenol interactions, both in a head-to-tail fashion.