Potential enthalpic energy of water in oils exploited to control supramolecular structure

Nature
Nathan J Van ZeeE W Meijer

Abstract

Water directs the self-assembly of both natural1,2 and synthetic3-9 molecules to form precise yet dynamic structures. Nevertheless, our molecular understanding of the role of water in such systems is incomplete, which represents a fundamental constraint in the development of supramolecular materials for use in biomaterials, nanoelectronics and catalysis 10 . In particular, despite the widespread use of alkanes as solvents in supramolecular chemistry11,12, the role of water in the formation of aggregates in oils is not clear, probably because water is only sparingly miscible in these solvents-typical alkanes contain less than 0.01 per cent water by weight at room temperature 13 . A notable and unused feature of this water is that it is essentially monomeric 14 . It has been determined previously 15 that the free energy cost of forming a cavity in alkanes that is large enough for a water molecule is only just compensated by its interaction with the interior of the cavity; this cost is therefore too high to accommodate clusters of water. As such, water molecules in alkanes possess potential enthalpic energy in the form of unrealized hydrogen bonds. Here we report that this energy is a thermodynamic driving force for water molecule...Continue Reading

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Citations

Jan 30, 2019·Angewandte Chemie·Sebastian SchroederMeike Niggemann
May 31, 2019·Organic & Biomolecular Chemistry·Nieves LavadoPedro Cintas
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Methods Mentioned

BETA
atomic force microscopy
circular dichroism
fluorescence microscopy
AFM
light scattering
light-scattering
column chromatography
nuclear magnetic resonance
linear dichroism
X-ray

Software Mentioned

NIS
Saxsgui
iPAINT
PLATON
VASP
SADABS
element Nikon
SHELXT

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