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Metal containing cryptands as hosts for anions: evaluation of Cu(I)···X and π···X interactions in halide-tricopper(I) complexes through relativistic DFT calculations

Abstract : More selective than crown ethers, cryptands arise as suitable hosts for several ions, with the size of the cavity and the behavior of the atoms belonging to the structure being the main factors governing their selectivity. Similar to metallacrowns, inorg. counterparts of crown ethers, the presence of metal centers in cryptands can offer significant advantages in terms of ion recognition as they provide pos. charged sites, which allow them to encapsulate anions. Here, through d. functional methodologies, we evaluate the preference of a tricopper(I) cryptand host toward a series of halide ions ranging from the hard fluoride to the soft iodide, where the more intense interactions are established with the hardest one, and the electrostatic term is the more relevant contributor to total interaction energy. Upon exploration of this electrostatic contribution in more detail, it is obsd. that as the guest becomes softer, the increase of higher order Coulombic terms, such as dipole-dipole, dipole-quadrupole, and quadrupole-quadrupole, acquires more relevance on going from 9.22% to 41.25%, denoting the key role and variation of such forces in inclusion systems with metal-contg. hosts.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01174894
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Submitted on : Friday, July 10, 2015 - 10:39:46 AM
Last modification on : Friday, July 10, 2020 - 4:24:54 PM

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Miguel Ponce-Vargas, Alvaro Munoz-Castro. Metal containing cryptands as hosts for anions: evaluation of Cu(I)···X and π···X interactions in halide-tricopper(I) complexes through relativistic DFT calculations. Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2015, 17 (28), pp.18677-18683. ⟨10.1039/C5CP02737C⟩. ⟨hal-01174894⟩

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