Isothermal Calorimetric Titrations on Charge-Assisted Halogen Bonds: Role of Entropy, Counterions, Solvent, and Temperature

被引：140
|
作者：
Walter, Sebastian M. [1 ]
Kniep, Florian [1 ]
Rout, Laxmidhar [1 ]
Schmidtchen, Franz P. [1 ]
Herdtweck, Eberhardt [1 ]
Huber, Stefan M. [1 ]
机构：
[1] Tech Univ Munich, Dept Chem, D-85747 Garching, Germany
来源：
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2012年 / 134卷 / 20期
关键词：
ANION RECOGNITION; HYDROGEN-BONDS; BINDING; CONSTRUCTION; COMPLEXES; RECEPTOR; HETEROATOM; DONORS; IODINE; ADDUCT;
D O I：
10.1021/ja2119207
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
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 x 10(6) M-1.
引用
收藏
页码：8507 / 8512
页数：6
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