2010
DOI: 10.1002/chem.200902107
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Self‐Assembly of Ureido‐Pyrimidinone Dimers into One‐Dimensional Stacks by Lateral Hydrogen Bonding

Abstract: Ureido-pyrimidinone (UPy) dimers substituted with an additional urea functionality self-assemble into one-dimensional stacks in various solvents through lateral non-covalent interactions. (1)H NMR and DOSY studies in CDCl(3) suggest the formation of short stacks (<10), whereas temperature-dependent circular dichroism (CD) studies on chiral UPy dimers in heptane show the formation of much larger helical stacks. Analysis of the concentration-dependent evolution of chemical shift in CDCl(3) and the temperature-de… Show more

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Cited by 94 publications
(36 citation statements)
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“…However, in a report on the self-assembly of ureido-pyrimidinones, which exhibit intermolecular lateral hydrogen bonds between the urea group, the mechanism of supramolecular polymerization has been reported to follow an isodesmic process. [52] But the cooling curves obtained seem to be non-sigmoidal and almost linear. Thus, we expect that monitoring of other properties that change upon polymerization (such as viscosity) as a function of temperature might give a better representation of the mechanism involved.…”
Section: Discussionmentioning
confidence: 94%
“…However, in a report on the self-assembly of ureido-pyrimidinones, which exhibit intermolecular lateral hydrogen bonds between the urea group, the mechanism of supramolecular polymerization has been reported to follow an isodesmic process. [52] But the cooling curves obtained seem to be non-sigmoidal and almost linear. Thus, we expect that monitoring of other properties that change upon polymerization (such as viscosity) as a function of temperature might give a better representation of the mechanism involved.…”
Section: Discussionmentioning
confidence: 94%
“…Once the monomer-dimer model was discarded, the isodesmic model was proposed for the aggregation of the compounds under study. [28] In this model, which has been successfully applied to describe the p-p stacking of several molecules such as perylene bisimides, [27][28][29][30] hexabenzocoronenes [31] or phenylene ethynylene macrocycles, [32] the same association constant, K, value is assumed for all the binding processes. [33] In applying the isodesmic model, we calculated the association constants of all the compounds and subsequently confirmed the applicability of the model.…”
Section: Aggregation Model and Association Constantsmentioning
confidence: 99%
“…10.18) [45]. Regarding the urea-substituted molecule, the formation of the 1-D stacks was due to the lateral aggregation of urea-hydrogen bonding and their additional stabilization by the aromatic-aromatic π-π stacking confirmed by the concentration-dependent 1 H NMR and DOSY spectroscopy.…”
Section: Supramolecular Polymers Constructed By Orthogonalmentioning
confidence: 80%