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Pulsed Gradient Spin Echo (PGSE) Diffusion Measurements as a Tool for the Elucidation of a New Type of Hydrogen‐Bonded Bicapsular Aggregate
Author(s) -
Alajarín Mateo,
Pastor Aurelia,
Orenes RaúlAngel,
MartínezViviente Eloísa,
Pregosin Paul S.
Publication year - 2006
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200500021
Subject(s) - diffusion , chemistry , hydrogen , spin echo , spectroscopy , amine gas treating , tris , spin diffusion , nuclear magnetic resonance spectroscopy , chemical physics , crystallography , analytical chemistry (journal) , organic chemistry , thermodynamics , physics , medicine , biochemistry , radiology , quantum mechanics , magnetic resonance imaging
Compounds formed by linking two tris(ureidobenzyl)amine modules with a hexamethylene tether are described. These compounds self‐assemble to form bicapsular aggregates featuring two rings of six hydrogen‐bonded ureas. 1 H and 1 H/ 1 H ROESY NMR spectroscopy, together with pulsed gradient spin echo (PGSE) NMR diffusion measurements, have been used to characterize the dimers in solution. The results have been compared with energy‐minimized structures. The new compounds are kinetically stable on the NMR timescale, and their thermodynamic stabilities are comparable to other capsular aggregates derived from tris(ureidobenzyl)amines.