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2,2'-Bipyridine Derivatives as Halogen Bond Acceptors in Multicomponent Crystals.
Crystal Growth & Design 2023 December 7
In this work, we present a systematic study of the halogen bonding potential of different 2,2'-bipyridine derivatives in the synthesis of cocrystals by using selected perfluorinated iodobenzenes and N -haloimides as halogen bond donors. These halogen bond acceptor molecules were chosen to explore how different substituents on 2,2'-bipyridine affect halogen bond formation. Out of 24 combinations, we obtained only 8 cocrystals by using two methods, liquid-assisted grinding and crystallization from the solution. Of those 8 cocrystals, one has already been described in the literature. As expected, structural data revealed that 2,2'-bipyridine derivatives act as ditopic halogen bond acceptors in all structures. Dominant interactions in 7 of the cocrystals are I···N or Br···N halogen bonds, while in the one remaining cocrystal it is the I···C(π) halogen bond.
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