954407-25-1Relevant academic research and scientific papers
Five additional macrocycles that allow Na+ ion-templated threading of guest units featuring a single urea or amide functionality
Lin, You-Han,Lai, Chien-Chen,Chiu, Sheng-Hsien
, p. 2907 - 2917 (2014/05/06)
Five analogues of the macrocycle BPX26C6 are also capable of recognizing single urea and/or amide functionalities in the presence of templating Na + ions. We have unambiguously confirmed the formation of such [2]pseudorotaxane complexes in solution through syntheses of the corresponding [2]rotaxanes. This journal is the Partner Organisations 2014.
Catalytic ship-in-a-bottle assembly within hollow porous nanocapusles
Ehterami, Nasim,Dergunov, Sergey A.,Ussipbekova, Yenlik,Birman, Vladimir B.,Pinkhassik, Eugene
supporting information, p. 481 - 485 (2014/02/14)
Large molecules can be assembled from small components exclusively inside hollow nanocapsules with the help of entrapped catalysts. Phenyl isocyanates enter the capsules through nanopores in the capsule shells and form cyclic trimers that remain entrapped
Sodium ions template the formation of rotaxanes from BPX26C6 and nonconjugated amide and urea functionalities
Lin, You-Han,Lai, Chien-Chen,Liu, Yi-Hung,Peng, Shie-Ming,Chiu, Sheng-Hsien
supporting information, p. 10231 - 10236 (2013/10/21)
Picking up the thread: The macrocycle bis-p-xylyl[26]crown-6 is capable of forming pseudorotaxane-like structures with single, nonconjugated urea or amide moieties when assisted by templating Na+ ions (see example). By using this approach, rotaxanes were synthesized with glycine residues or the repeating unit of nylon-6,6 as key components in the threadlike units. Copyright
The tris-urea motif and its incorporation into polydimethylsiloxane-based supramolecular materials presenting self-healing features
Roy, Nabarun,Buhler, Eric,Lehn, Jean-Marie
supporting information, p. 8814 - 8820 (2013/07/26)
Materials of supramolecular nature have attracted much attention owing to their interesting features, such as self-reparability and material robustness, that are imparted by noncovalent interactions to synthetic materials. Among the various structures and synthetic methodologies that may be considered for this purpose, the introduction of extensive arrays of multiple hydrogen bonds allows for the formation of supramolecular materials that may, in principle, present self-healing behavior. Hydrogen bonded networks implement dynamic noncovalent interactions. Suitable selection of structural units gives access to novel dynamic self-repairing materials by incrementing the number of hydrogen-bonding sites present within a molecular framework. Herein, we describe the formation of a tris-urea based motif giving access to six hydrogen-bonding sites, easily accessible through reaction of carbohydrazide with an isocyanate derivative. Extension towards the synthesis of multiply hydrogen-bonded supramolecular materials has been achieved by polycondensation of carbohydrazide with a bis-isocyanate component derived from poly-dimethylsiloxane chains. Such materials underwent self-repair at a mechanically cut surface. This approach gives access to a broad spectrum of materials of varying flexibility by appropriate selection of the bis-isocyanate component that forms the polymer backbone. Healing power: Easy access to a tris-urea motif, with the possibility of forming six H-bonds, has been demonstrated. This concept was further extended to the formation of soft functional materials based on polydimethylsiloxane moieties amenable to self-repair (see figure). Copyright
Dynamic Covalent chemistry: A facile room-temperature, reversible, diels-alder reaction between anthracene derivatives and n-phenyltriazolinedione
Roy, Nabarun,Lehn, Jean-Marie
supporting information; scheme or table, p. 2419 - 2425 (2012/07/03)
A series of readily accessible, dynamic Diels-Alder reactions that are reversible at room temperature have been developed between anthracene derivatives as dienes and N-phenyl-1,2,4-triazoline-3,5-dione as the dienophile. The adducts formed undergo reversible component exchange to form dynamic libraries of equilibrating cycloadducts. Furthermore, reversible adduct formation allows temperature-dependent modulation of the fluorescent properties of anthracene components; a feature of potential interest for the design of optodynamic polymeric materials by careful selection and manipulation of these simple dienes and dienophiles. Copyright
Using acetate anions to induce translational isomerization in a neutral urea-based molecular switch
Huang, Yi-Lin,Hung, Wei-Chung,Lai, Chien-Chen,Liu, Yi-Hung,Peng, Shie-Ming,Chiu, Sheng-Hsien
, p. 6629 - 6633 (2008/09/18)
Vying for urea: The translational isomerism of a neutral [2]rotaxane can be controlled in solution through the addition and removal of acetate anions. In the absence of acetate ions, the macrocyclic host recognizes a diphenylurea derivative; recognition of acetate ions by the urea-based station causes relocation of the macrocycle to another binding site (see picture). (Figure Presented).
