cg060325c_si_011.cif (15.18 kB)
Cation-Induced Supramolecular Isomerism in the Hydrogen-Bonded Network of Secondary Ammonium Monocarboxylate Salts: A New Class of Organo Gelator and Their Structures
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posted on 2006-09-06, 00:00 authored by Darshak R. Trivedi, Parthasarathi DastidarA series of secondary ammonium monocarboxylate salts have been prepared by reacting variously substituted cinnamic
acids and benzoic acids with dibenzylamine. Gelation tests reveal that 19 salts (9 cinnamates and 10 benzoates) are moderate to
good gelators of various organic fluids, including commercial fuels such as gasoline and diesel fuel. Structure−property correlation
studies based on single-crystal structures of 18 salts indicate that the one-dimensional hydrogen-bonded network is indeed important
for gelation. The conformational flexibility of the dibenzyl cation and various intra- and internetwork C−H···π and C−H···O
interactions appear to be responsible for the stabilization of the one-dimensional network in these salts. The gel fibrils in the xerogel
state for 8 salts also adopt a 1D hydrogen-bonded network, as revealed by detailed X-ray powder diffraction studies, further supporting
the importance of the one-dimensional network in the gelation process.