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Remarkable structures of cyclotri(deoxycholate) and cyclotetra(24-norcholate) acetate esters
Jerry Ray Dias1, Robert A Pascal, Jason Morrill
1Department of Chemistry, University of Missouri-Kansas City, Kansas City, Missouri 64110-2499, USA.
Structural analysis of large macrocycles, cyclotri(deoxycholate) and cyclotetra(24-norcholate), was achieved using X-ray crystallography and AM1 calculations. These methods revealed both solid-state and gas-phase molecular structures.
Area of Science:
- Supramolecular Chemistry
- Structural Biology
- Computational Chemistry
Background:
- Understanding the three-dimensional structures of complex molecules is crucial in chemistry and biology.
- Macrocycles, particularly large open ones, present unique structural challenges due to their conformational flexibility.
Purpose of the Study:
- To determine the solid-state and gas-phase structures of cyclotri(deoxycholate) and cyclotetra(24-norcholate).
- To investigate the structural characteristics of large open macrocycles.
Main Methods:
- X-ray crystallographic determinations were employed to elucidate solid-state structures.
- Austin Model 1 (AM1) calculations were utilized for gas-phase structure analysis.
Main Results:
- The solid-state and gas-phase structures of cyclotri(deoxycholate) were successfully defined.
- The solid-state and gas-phase structures of cyclotetra(24-norcholate) were determined.
- Cyclotetra(24-norcholate) represents one of the largest open macrocycles ever characterized by crystallography.
Conclusions:
- The study successfully defined the structures of two significant macrocycles.
- The findings contribute to the understanding of large macrocycle structural chemistry.
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