Issue 3, 2021

The elusive crystals of calcium acetate hemihydrate: chiral rods linked by parallel hydrophilic strips

Abstract

Calcium acetate hemihydrate is found in the efflorescent salts that form on pottery and other calcareous heritage artefacts. The formation of these salts can lead to deterioration of these objects. A recent analysis of the structure of Ca(OAc)2·½H2O by X-ray powder diffraction (XRPD) has revealed it has a remarkable and surprisingly complex structure. Although the compound usually exists in powder or microcrystalline form, often in mixtures with other salts, we have serendipitously managed to grow crystals of a size suitable for single crystal X-ray diffraction. Our single crystal data show the structure is based on infinite supramolecular polymeric rods that are chiral. Each rod has a minimum diameter of 1.75 nm and the external surface of each rod features four parallel, hydrophobic domains separated by hydrophilic strips. Each hydrophilic strip consists of acetate oxygen atoms and coordinated water molecules that are able to form hydrogen bonding interactions with symmetry-related strips on a neighbouring rod in an arrangement that resembles a zipper. Within the extended crystal structure each rod is bound to four rods of opposite handedness to give a racemic mixture.

Graphical abstract: The elusive crystals of calcium acetate hemihydrate: chiral rods linked by parallel hydrophilic strips

Supplementary files

Article information

Article type
Paper
Submitted
02 Nov 2020
Accepted
06 Dec 2020
First published
07 Dec 2020

CrystEngComm, 2021,23, 707-713

The elusive crystals of calcium acetate hemihydrate: chiral rods linked by parallel hydrophilic strips

B. F. Abrahams, C. J. Commons, T. A. Hudson and R. W. Sanchez Arlt, CrystEngComm, 2021, 23, 707 DOI: 10.1039/D0CE01590C

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