Hydrogen-bonded sheets in the 1:1 salt of tet-b and trimesic acid.
Tet-b (racemic 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane, C(16)H(36)N(4)) and trimesic acid (1,3,5-benzenetricarboxylic acid, C(9)H(6)O(6)) form a salt partially solvated by both water and methanol, i.e. 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane-1,3,5-benzenetricarboxylic acid--methanol--water (1/1/0.78/1.12), C(16)H(38)N(4)(2+) x C(9)H(4)O(6)(2-) x 0.78CH(4)O x 1.12H(2)O. The anions are linked by O--H...O hydrogen bonds [O...O 2.442 (4) and 2.458 (4) A; O--H...O 170 and 171 degrees ] into zigzag chains; orientationally disordered cations are linked to the anion chains by means of N--H...O hydrogen bonds [major orientation: N...O 2.695 (3)--3.071 (4) A, N--H...O 148--179 degrees; minor orientation: N...O 2.75 (2)--3.34 (2) A, N--H...O 147--170 degrees ] and link the chains into sheets. The solvent molecules are all disordered, but appear to play no significant structural role apart from space filling.
School of Chemistry, University of St Andrews, St Andrews, Fife KY16 9ST, Scotland.
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