TY  - JOUR
PY  - 2008//
TI  - Cooperative Binding of Calix[4]pyrrole–Anion Complexes and Alkylammonium Cations in Halogenated Solvents
JO  - Chemistry: a European journal
A1  - Gross, Dustin E
A1  - Schmidtchen, Franz P
A1  - Antonius, Wiebke
A1  - Gale, Philip A
A1  - Lynch, Vincent M
A1  - Sessler, Jonathan L
SP  - 7822
EP  - 7827
VL  - 14
IS  - 26
N2  - Calix[4]pyrrole–chloride interactions are affected not only by the choice of countercation in halogenated solvents, but show a specific dependence on the way in which these cations are bound within the electron rich, bowl-like calix[4]pyrrole cavity formed upon chloride anion complexation. In dichloromethane, the affinities of simple meso-octamethylcalix[4]pyrrole (1) for methyl-, ethyl-, and n-butylammonium chlorides are on the order of 105, 104, and 102 M−1, respectively, as determined from isothermal titration calorimetry (ITC) analyses. These cation-dependent anion affinity effects, while clearly evident, are less pronounced in other halogenated solvents, such as 1,2-dichloroethane. Support for the proposed cation complexation selectivity is provided by solid state X-ray crystallographic analyses.<p /> 
LA  - 
SN  - 0947-6539
UR  - http://dx.doi.org/10.1002/chem.200800899
ID  - ref1
ER  -