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Volumn 10, Issue 17, 2004, Pages 4233-4239

Relative binding affinities of molecular capsules investigated by ESI-mass spectrometry

Author keywords

Binding affinities; Mass spectrometry; Molecular capsules; Self assembly; Supramolecular chemistry

Indexed keywords

BINDING ENERGY; DISSOCIATION; MIXTURES; NUCLEAR MAGNETIC RESONANCE; STABILIZATION; TITRATION;

EID: 4644354552     PISSN: 09476539     EISSN: None     Source Type: Journal    
DOI: 10.1002/chem.200400034     Document Type: Article
Times cited : (42)

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    • Kim et al. have recently presented ammonium receptors in water relying on the interaction of three pyrazole nitrogen atoms with the positively polarized NH bonds of the guest: J. Chin, C. Walsdorff, B. Stranix, J. Oh, H. J. Chung, S.-M. Park, K. Kim, Angew. Chem. 1999, 111, 2923-2926; Angew. Chem. Int. Ed. 1999, 38, 2756-2759. In Monte-Carlo simulations a intriguingly high stability was found for the pyrazolium/pyrazole assembly relying mainly on dispersive forces and π-cation interactions. For steric reasons the pyrazolium pyrazole assembly easily loses one pyrazole nucleus leading to the most abundant molecular ion peak in the ESI spectrum.
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    • Kim et al. have recently presented ammonium receptors in water relying on the interaction of three pyrazole nitrogen atoms with the positively polarized NH bonds of the guest: J. Chin, C. Walsdorff, B. Stranix, J. Oh, H. J. Chung, S.-M. Park, K. Kim, Angew. Chem. 1999, 111, 2923-2926; Angew. Chem. Int. Ed. 1999, 38, 2756-2759. In Monte-Carlo simulations a intriguingly high stability was found for the pyrazolium/pyrazole assembly relying mainly on dispersive forces and π-cation interactions. For steric reasons the pyrazolium pyrazole assembly easily loses one pyrazole nucleus leading to the most abundant molecular ion peak in the ESI spectrum.
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    • note
    • 0 needed for the total dissociation of the capsules, the ratio in k converges to 1.
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    • Schrödinger Inc., Force-field: OPLS-AA, water, Monte-Carlo: 1000 steps
    • MacroModel 7.0, Schrödinger Inc. 2000, Force-field: OPLS-AA, water, Monte-Carlo: 1000 steps.
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