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Mechanochemical Mediated Coexistence of B←N Coordination and Hydrogen Bonding
Journal article   Open access   Peer reviewed

Mechanochemical Mediated Coexistence of B←N Coordination and Hydrogen Bonding

Maria Guadalupe Vasquez-Rios, Gonzalo Campillo-Alvarado and Leonard R. MacGillivray
Angewandte Chemie, Vol.135(35), e202308350
08/28/2023
DOI: 10.1002/ange.202308350
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https://doi.org/10.1002/ange.202308350View
Published (Version of record) Open Access

Abstract

Mechanochemistry afforded a photoactive cocrystal via coexisting (B)O−H⋅⋅⋅N hydrogen bonds and B←N coordination. Specifically, solvent-free mechanochemical ball mill grinding and liquid-assisted grinding of a boronic acid and an alkene resulted in mixtures of hydrogen-bonded and coordinated complexes akin to mixtures of noncovalent complexes that can be obtained in solution in equilibria processes. The alkenes of the hydrogen-bonded assembly undergo an intermolecular [2+2] photodimerization in quantitative conversion, effectively reporting the outcome of the self-assembly processes. Our results suggest that interplay involving noncovalent bonds subjected to mechanochemical conditions can lead to functional solids where, in the current case, the structure composed of the weaker hydrogen bonding interactions predominates.

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