Lin C, Darling GR, Forster M, McBride F, Massey A, Hodgson A. Hydration of a 2D Supramolecular Assembly: Bitartrate on Cu(110).
J Am Chem Soc 2020;
142:13814-13822. [PMID:
32692550 PMCID:
PMC7458425 DOI:
10.1021/jacs.0c04747]
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Abstract
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Hydration
layers play a key role in many technical and biological
systems, but our understanding of these structures remains very limited.
Here, we investigate the molecular processes driving hydration of
a chiral metal–organic surface, bitartrate on Cu(110), which
consists of hydrogen-bonded bitartrate rows separated by exposed Cu.
Initially water decorates the metal channels, hydrogen bonding to
the exposed O ligands that bind bitartrate to Cu, but does not wet
the bitartrate rows. At higher temperature, water inserts into the
structure, breaks the existing intermolecular hydrogen bonds, and
changes the adsorption site and footprint. Calculations show this
process is driven by the creation of stable adsorption sites between
the carboxylate ligands, to allow hydration of O–Cu ligands
within the interior of the structure. This work suggests that hydration
of polar metal–adsorbate ligands will be a dominant factor
in many systems during surface hydration or self-assembly from solution.
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