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• W4366772294 abstract "Abstract Variable-temperature cryogenic ion mobility-mass spectrometry (VT-Cryo-IM-MS) was developed to examine the conformations of host-guest complexes. The VT-Cryo-IM-MS consists of an electrospray ionization source, a quadrupole ion trap, a cryogenic ion drift tube, and a time-of-flight mass spectrometer. The ion drift tube was cooled to 83 K with liquid nitrogen. Two sets of ion funnels are installed at the source and the drift tube to focus the ion beam. We used Li + -encapsulated fullerene (Li + @C 60 ) as a reference ion to examine the ion-mobility resolution of the VT-Cryo-IM-MS apparatus because this ion has a rigid structure with a single conformer. The temperature dependence of collision cross section (CCS) of Li + @C 60 and the resolution of the apparatus were determined at each temperature. We examined the conformations of host-guest complexes of a series of metal ions (M = Ca 2+ , Na + , Ag + , K + , Rb + , and Cs + ) with dibenzo-24-crown-8 (DB24C8) by Cryo-IM-MS. All CCS distributions were fitted with two Gaussian functions which are assigned to closed and open conformers. These closed and open conformers have different distances between the two benzene rings of DB24C8. The abundance ratio of closed conformers for these M(DB24C8) complex ions depends on the guest M ion with an order, Ca 2+ < Na + < Ag + < Cs + < Rb + < K + . The stability of the closed conformer of K + (DB24C8) originates from the benzene ring positional relationship which is quite close to that of the free benzene dimer. This special benzene dimer-like conformation produces the strong π - π interaction between the benzene rings of K + (DB24C8)." @default.
• W4366772294 created "2023-04-25" @default.
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• W4366772294 date "2023-04-21" @default.
• W4366772294 modified "2023-10-09" @default.
• W4366772294 title "Cryogenic ion mobility-mass spectrometry for the study of conformations of host-guest complexes" @default.
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• W4366772294 doi "https://doi.org/10.1140/epjti/s40485-023-00098-1" @default.
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