US EPA

7737626 

Journal Article 

Crystals of the Kemp's triacid salts. Part IV: Supramolecular architecture in the crystal of tetra(melaminium) bis(5-carboxy-1,3,5-trimethylcyclo-hexane-1,3-dicarboxylate) pentahydrate 

Huczynski, A; Janczak, Jan; Brzezinski, B 

2009 

Yes 

Journal of Molecular Structure
ISSN: 0022-2860
EISSN: 1872-8014 

ELSEVIER 

AMSTERDAM 

922 

1-3 

77-82 

English 

10.1016/j.molstruc.2009.01.045 

WOS:000265314800011 

Crystal: [2(C12H16O6)2-·4(C3H7N6)+·5(H2O)] is composed of two doubly deprotonated Kemp's triacid molecules (KTA2), four singly protonated melamine (MEL-H+) and five water molecules. In the crystal structure, protonated (MEL-H+) moieties are interconnected via N{single bond}H⋯N hydrogen bonds into polymeric 1D-chain and form a stacking structure. The rings of the KTA dianionic molecules exhibit a chair conformation with all three carboxylic groups in the axial positions and all three methyl groups in the equatorial positions. In the KTA2 anion, one strong and almost symmetrical intramolecular hydrogen bond is present. In the crystal of the complex, hydrogen-bonded chains involving intermolecular hydrogen bonds are formed. The water molecules act as proton-donors and proton-acceptors in three-dimensional hydrogen-bonded network within the supramolecular complex. The IR spectrum of the crystal is consistent with the results obtained by the X-ray study and provides spectroscopic evidence for the crystal formation. © 2009 Elsevier B.V. All rights reserved. 

X-ray; FT-IR; Kemp's triacid (KTA); Melamine; Hydrogen bond; Supramolecular complex