Supramolecular Hydrogen-bonded Structure of a 1:2 Adduct of Melamine with Boric Acid
Boric acid (B) forms a 2:1 hydrogen-bond adduct, M·2B, with melamine (M), wherein, a finite tetrameric ribbon of boric acid forms hydrogen bonds with the nitrogen donor sites of M. Hydrogen-bonded layers of B and M in the bc-plane are connected by boric acid units along the a-axis to give a three dimensional structure. Interestingly, one of the amino groups of M does not participate in hydrogen bonding unlike all the hydroxyl groups of B.
A. Roy et al., "Supramolecular Hydrogen-bonded Structure of a 1:2 Adduct of Melamine with Boric Acid," Journal of Molecular Structure, Versier, Jan 2002.
The definitive version is available at http://dx.doi.org/10.1016/S0022-2860(02)00128-X
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