Abstract by Jamir Shrestha

Personal Infomation

Presenter's Name

Jamir Shrestha

Degree Level



Zixuan Feng

Abstract Infomation


Chemistry and Biochemistry

Faculty Advisor

David Dearden


Determining topologies of alkylammonium complexes of Cucurbit[6]uril using multiCRAFTI techniques in an FTICR mass spectrometer.


Hollow, pumpkin-shaped cucurbit[6]uril (CB[6]) is known to form complexes with cationic species like alkylammonium ions. Singly charged 1:1 and doubly charged 1:2 complexes with alkylmonoammonium ions are detected in the gas phase using FTICR. Several isomeric forms are possible: the alkyl chains may bind inside or outside the cage, or with a part of the alkyl chain protruding. One way to address the question is through collision cross section measurements. Externally-bound complexes have larger cross sections than complexes with the alkyl chain inside the CB[6] cavity. We have applied the cross sectional areas by Fourier transform ion cyclotron resonance (“CRAFTI”) technique to address this question, using simultaneous measurements of 2 complexes (“multiCRAFTI”) to measure cross sections against an internal standard.