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Issue 29, 2013
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The structure of the melamine–cyanuric acid co-crystal

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The crystal structure of the melamine:cyanuric acid (CA.M) adduct has been redetermined and the previously reported cell is shown to be incorrect. The true unit cell has approximately twice the volume of the earlier cell. Crystal data for CA.M: monoclinic, space group I2/m, a = 14.8152(19) Å, b = 9.6353(18) Å, c = 7.0405(9) Å, β = 93.194(11)°, V = 1003.5(3) Å3, Z = 2. In contrast to the previous report, this contains an ordered array of cyanuric acid and melamine. Hydrogen bonding between the two components is described in detail and precise information about intermolecular distances reported for the first time. The structure contains hydrogen-bonded sheets stacked perpendicular to the crystallographic (101) plane. The molecular geometry of the cyanuric acid and melamine components is described in detail. Possible explanations for the difference between this structure and the previous report are described in the light of quantum chemical calculations.

Graphical abstract: The structure of the melamine–cyanuric acid co-crystal

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The article was received on 23 Apr 2013, accepted on 03 Jun 2013 and first published on 06 Jun 2013

Article type: Paper
DOI: 10.1039/C3CE40709H
Citation: CrystEngComm, 2013,15, 5838-5843
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    The structure of the melamine–cyanuric acid co-crystal

    T. J. Prior, J. A. Armstrong, D. M. Benoit and K. L. Marshall, CrystEngComm, 2013, 15, 5838
    DOI: 10.1039/C3CE40709H

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