Mapping C−H×××M Interactions in Confined Spaces: (a-ICyD Me )Au, Ag, Cu Complexes Reveal "Contra-electrostatic H-bonds" Masquerading as Anagostic Interactions - Sorbonne Université
Article Dans Une Revue Chemistry - A European Journal Année : 2021

Mapping C−H×××M Interactions in Confined Spaces: (a-ICyD Me )Au, Ag, Cu Complexes Reveal "Contra-electrostatic H-bonds" Masquerading as Anagostic Interactions

Résumé

What happens when a C-H bond is forced to interact with unpaired pairs of electrons at a positively charged metal? Such interactions can be considered as "contra-electrostatic" H-bonds, which combine the familiar orbital interaction pattern characteristic for the covalent contribution to the conventional H-bonding with an unusual contra-electrostatic component. While electrostatics is strongly stabilizing component in the conventional C-H … X bonds where X is an electronegative main group element, it is destabilizing in the C-H … M contacts when M is Au(I), Ag(I), or Cu(I) of NHC-M-Cl systems. Such remarkable C-H … M interaction became experimentally accessible within (α-ICyD Me )MCl, NHC-Metal complexes embedded into cyclodextrins. Computational analysis of the model systems suggests that the overall interaction energies are relatively insensitive to moderate variations in the directionality of interaction between a C-H bond and the metal center, indicating stereoelectronic promiscuity of fully filled set of d -orbitals. A combination of experimental and computational data demonstrates that metal encapsulation inside the cyclodextrin cavity forces the C-H bond to point toward the metal, and reveals a still attractive "contra-electrostatic" H-bonding interaction.

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Dates et versions

hal-03184533 , version 1 (29-03-2021)

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Gabriel dos Passos Gomes, Guangcan Xu, Xiaolei Zhu, Lise-Marie Chamoreau, Yongmin Zhang, et al.. Mapping C−H×××M Interactions in Confined Spaces: (a-ICyD Me )Au, Ag, Cu Complexes Reveal "Contra-electrostatic H-bonds" Masquerading as Anagostic Interactions. Chemistry - A European Journal, 2021, ⟨10.1002/chem.202100263⟩. ⟨hal-03184533⟩
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