Surprising solvent-induced structural rearrangements in large [N···I⁺···N] halogen-bonded supramolecular capsules: an ion mobility-mass spectrometry study.

ABSTRACT: Coordinative halogen bonds have recently gained interest for the assembly of supramolecular capsules. Ion mobility-mass spectrometry and theoretical calculations now reveal the well-defined gas-phase structures of dimeric and hexameric [N···I⁺···N] halogen-bonded capsules with counterions located inside their cavities as guests. The solution reactivity of the large hexameric capsule shows the intriguing solvent-dependent equilibrium between the hexamer and an unprecedented pentameric [N···I⁺···N] halogen-bonded capsule, when the solvent is changed from chloroform to dichloromethane. The intrinsic flexibility of the cavitands enables this novel structure to adopt a pseudo-trigonal bipyramidal geometry with nine [N···I⁺···N] bonds along the edges and two pyridine binding sites uncomplexed.

SUBMITTER: Warzok U 

PROVIDER: S-EPMC6243472 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature