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Updated: Sep 28, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Quantitative evaluation of the chloride template effect in the formation of dicationic [1(4)]imidazoliophanes
Susana Ramos1, Ermitas Alcalde, Giancarlo Doddi
1Dipartimento di Chimica e CNR-ICCOM-Sezione di Roma, Università di Roma "La Sapienza", P.le Aldo Moro, 2, 00185 Roma, Italy.
Abstract:
The formation of macrocycles containing two imidazolium rings such as 1.2X and 2.2X is anion-directed through hydrogen bonding. The template effect exerted by the chloride anion in the ring-closure reaction of the monocationic model intermediate 9+ to yield the [1(4)]imidazoliophane 2(2+) has been evaluated. This effect was quantified following the kinetics of the macrocyclization by using a UV-vis technique. The rate of the ring closure of monocation 9+ is increased up to 10 times, in the presence of Bu4NCl 0.04 M. This finding confirms that the template effect is operative in the macrocyclization leading to dicationic [1(4)]imidazoliophanes.
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