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- Title
Size Determination of Organic Cages by Diffusion NMR Spectroscopy.
- Authors
Ivanova, Svetlana; Adamski, Paul; Köster, Eva; Schramm, Louis; Fröhlich, Rebecca; Beuerle, Florian
- Abstract
Reliable structure elucidation of covalent organic cage compounds remains challenging as routine analysis might leave ambiguities. Diffusion‐ordered NMR spectroscopy (DOSY) allows insight into the molecular size and mass of the species present in solution, but a systematic evaluation of the diffusion behavior for cage assemblies is rarely considered. Here we report the synthesis of four series of covalent organic cages based on tribenzotriquinacenes and diboronic acids with varying geometry and exohedral substituents. We provide a guideline for the consistent measurement of diffusion coefficients from 1H‐DOSY NMR spectroscopy, which was utilized to study the diffusion behavior for the whole set of cages and selected examples from the literature. For structurally similar cages, a linear correlation between the solvodynamic volume and the molecular mass allows precise size determination. For more complex systems, multiple parameters, such as window size or rigid exohedral functionalization. further modulate cage diffusion in solution.
- Subjects
DIFFUSION measurements; MOLECULAR volume; MOLECULAR weights; MOLECULAR size; BEHAVIORAL assessment; NUCLEAR magnetic resonance spectroscopy
- Publication
Chemistry - A European Journal, 2024, Vol 30, Issue 9, p1
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.202303318