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Media type:
E-Article
Title:
Halogen‐Bonded Supramolecular Capsules in the Solid State, in Solution, and in the Gas Phase
Contributor:
Dumele, Oliver;
Schreib, Benedikt;
Warzok, Ulrike;
Trapp, Nils;
Schalley, Christoph A.;
Diederich, François
Published:
Wiley, 2017
Published in:
Angewandte Chemie International Edition, 56 (2017) 4, Seite 1152-1157
Language:
English
DOI:
10.1002/anie.201610884
ISSN:
1433-7851;
1521-3773
Origination:
Footnote:
Description:
AbstractSupramolecular capsules were assembled by neutral halogen bonding (XB) and studied in the solid state, in solution, and in the gas phase. The geometry of the highly organized capsules is shown by an X‐ray crystal structure which features the assembly of two XB hemispheres, geometrically rigidified by H‐bonding to eight MeOH molecules and encapsulation of two benzene guests. To enhance capsular association strength, tuning the XB donor is more efficient than tuning the XB acceptor, due to desolvation penalties in protic solvents, as shown for a tetraquinuclidine XB acceptor hemisphere. With a tetra(iodoethynyl) XB donor and a tetralutidine XB acceptor, the association in deuterated benzene/acetone/methanol 70:30:1 at 283 K reaches Ka=(2.11±0.39)×105 m−1 (ΔG=−6.9±0.1 kcal mol−1). The stability of the XB capsules in the gas phase was confirmed by electrospray ionization mass spectrometry (ESI‐MS). A new guest binding site was uncovered within the elongated iodoethynyl capsule.