摘要:
A complex crystal [H(3)KTA-TAEA-EA] is composed of triply deprotonated Kemp's triacid molecule (KTA(3-)), triply protonated tris(2-aminoethyl)amine (H(3)TAEA(3+)) molecule and one ethanol molecule (EA) as a solvate. The ring of the (KTA(3-)) trianion exhibits an uncommon twisted boat conformation with two carboxylic groups in the axial positions and one in the equatorial position. In the crystal each KTA(3-) trianion is hydrogen-bonded with four H3TAEA3+ molecules forming three-dimensional hydrogen-bonded network within the supramolecular complex. The ethanol molecules form a uncommon dimer bonded by very weak tandem hydrogen bonds. 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. (C) 2011 Elsevier B.V. All rights reserved.