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Issue 22, 2019
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Understanding the affinity of bis-exTTF macrocyclic receptors towards fullerene recognition

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Abstract

A new series of fullerene receptors based on exTTF macrocycles with alkyl ether chains of increasing length is reported. The novel macrocyclic receptors are able to favourably interact with fullerene C60 through a synergistic combination of π–π, CH⋯π and n⋯π noncovalent interactions. We identify that the highest affinity towards C60 recognition is achieved for the host with the tightest fit; that is, the smallest receptor with a cavity large enough to host the buckyball inside (log Ka = 5.2 in chlorobenzene at 298 K). However, besides this expected observation, theoretical calculations evidence that the most stable self-assembling configuration corresponds for all the receptors to an outside-ring binding mode, in which the C60 guest is out of the cavity of the receptor. The higher stability of this configuration results from the smaller deformation energy it implies for the receptor, and allows to explain the experimental trends in the association constants.

Graphical abstract: Understanding the affinity of bis-exTTF macrocyclic receptors towards fullerene recognition

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Publication details

The article was received on 28 Mar 2019, accepted on 18 May 2019 and first published on 20 May 2019


Article type: Paper
DOI: 10.1039/C9CP01735F
Phys. Chem. Chem. Phys., 2019,21, 11670-11675

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    Understanding the affinity of bis-exTTF macrocyclic receptors towards fullerene recognition

    J. Calbo, A. de Juan, J. Aragó, J. Villalva, N. Martín, E. M. Pérez and E. Ortí, Phys. Chem. Chem. Phys., 2019, 21, 11670
    DOI: 10.1039/C9CP01735F

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