Isothermal calorimetric titrations on charge-assisted halogen bonds: Role of entropy, counterions, solvent, and temperature

Sebastian M. Walter, Florian Kniep, Laxmidhar Rout, Franz P. Schmidtchen, Eberhardt Herdtweck, Stefan M. Huber

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

147 Zitate (Scopus)

Abstract

We have conducted isothermal calorimetric titrations to investigate the halogen-bond strength of cationic bidentate halogen-bond donors toward halides, using bis(iodoimidazolium) compounds as probes. These data are intended to aid the rational design of halogen-bond donors as well as the development of halogen-bond-based applications in solution. In all cases examined, the entropic contribution to the overall free energy of binding was found to be very important. The binding affinities showed little dependency on the weakly coordinating counteranions of the halogen-bond donors but became slightly stronger with higher temperatures. We also found a marked influence of different solvents on the interaction strength. The highest binding constant detected in this study was 3.3 × 10 6 M -1.

OriginalspracheEnglisch
Seiten (von - bis)8507-8512
Seitenumfang6
FachzeitschriftJournal of the American Chemical Society
Jahrgang134
Ausgabenummer20
DOIs
PublikationsstatusVeröffentlicht - 23 Mai 2012

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