1
|
Debnath S, Upadhyay C, Ojha U. Healable, Recyclable, and Programmable Shape Memory Organogels Based on Highly Malleable Catalyst-Free Carboxylate Linkages. ACS Appl Mater Interfaces 2022; 14:9618-9631. [PMID: 35148046 DOI: 10.1021/acsami.1c24946] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The development of healable and recyclable organogels possessing responsive abilities is mainly hindered by the unavailability of many dynamic covalent linkages that undergo exchange reaction below the boiling temperature of organic swelling medium. Furthermore, the exchange is desired to be effective under catalyst-free conditions to circumvent the issue of catalyst leaching during the swelling process. Especially, imparting swift reversibility to thermostable carboxylate linkages is challenging. In this approach, we have utilized the β-keto anchimeric assistance as the tool to induce swift reversibility into the conventional carboxylate linkage under mild temperature (∼70-90 °C) and catalyst-free conditions. Using this β-keto carboxylate linkage as an associative bond exchange mean, strong (tensile strength = 0.3 MPa) and stretchable (ultimate elongation ≈ 600%) covalent adaptable organogels (CAOs) with anisotropic swelling, remoldable, self-healing, and shape memory ability are derived from commercially available precursors. The shape memory ability of these samples shows dependency on the shape fixing time and can be programmed, targeting further applications. Soft actuators may be fabricated from the CAOs using temperature and solvent as the activating tools. This research demonstrates that the conventional carboxylate linkages can be made labile under mild conditions for further applications.
Collapse
Affiliation(s)
- Suman Debnath
- Department of Chemistry, Rajiv Gandhi Institute of Petroleum Technology, Bahadurpur, Harbanshganj, Jais 229304, India
| | - Chandan Upadhyay
- Department of Chemistry, Rajiv Gandhi Institute of Petroleum Technology, Bahadurpur, Harbanshganj, Jais 229304, India
| | - Umaprasana Ojha
- Department of Chemistry, Rajiv Gandhi Institute of Petroleum Technology, Bahadurpur, Harbanshganj, Jais 229304, India
| |
Collapse
|
2
|
Nathanael JG, Gamon LF, Cordes M, Rablen PR, Bally T, Fromm KM, Giese B, Wille U. Amide Neighbouring-Group Effects in Peptides: Phenylalanine as Relay Amino Acid in Long-Distance Electron Transfer. Chembiochem 2018; 19:922-926. [PMID: 29460322 DOI: 10.1002/cbic.201800098] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2018] [Indexed: 12/27/2022]
Abstract
In nature, proteins serve as media for long-distance electron transfer (ET) to carry out redox reactions in distant compartments. This ET occurs either by a single-step superexchange or through a multi-step charge hopping process, which uses side chains of amino acids as stepping stones. In this study we demonstrate that Phe can act as a relay amino acid for long-distance electron hole transfer through peptides. The considerably increased susceptibility of the aromatic ring to oxidation is caused by the lone pairs of neighbouring amide carbonyl groups, which stabilise the Phe radical cation. This neighbouring-amide-group effect helps improve understanding of the mechanism of extracellular electron transfer through conductive protein filaments (pili) of anaerobic bacteria during mineral respiration.
Collapse
Affiliation(s)
- Joses G Nathanael
- School of Chemistry, Bio21 Institute, The University of Melbourne, 30 Flemington Road, Parkville, Victoria, 3010, Australia
| | - Luke F Gamon
- School of Chemistry, Bio21 Institute, The University of Melbourne, 30 Flemington Road, Parkville, Victoria, 3010, Australia
| | - Meike Cordes
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056, Basel, Switzerland
| | - Paul R Rablen
- Department of Chemistry and Biochemistry, Swarthmore College, 500 College Avenue, Swarthmore, PA, 19081-1397, USA
| | - Thomas Bally
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700, Fribourg, Switzerland
| | - Katharina M Fromm
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700, Fribourg, Switzerland
| | - Bernd Giese
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700, Fribourg, Switzerland
| | - Uta Wille
- School of Chemistry, Bio21 Institute, The University of Melbourne, 30 Flemington Road, Parkville, Victoria, 3010, Australia
| |
Collapse
|
3
|
Abstract
A straightforward access to a hitherto unknown C3 -symmetric tricyclic triol both in racemic and enantiopure forms has been developed. Treatment of 7-tert-butoxynorbornadiene with peroxycarboxylic acids provided mixtures of C1 - and C3 -symmetric 3,5,7-triacyloxynortricyclenes via transannular π-cyclization and replacement of the tert-butoxy group. By refluxing in formic acid, the C1 -symmetric esters were converted to the C3 -symmetric formate. Hydrolysis gave diastereoisomeric triols, which were separated by recrystallization. Enantiomer resolution via diastereoisomeric tri(O-methylmandelates) delivered the target triols on a gram scale. The pure enantiomers are useful as core units of dopants for liquid crystals.
Collapse
Affiliation(s)
- Volodymyr Kozel
- Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, 48149, Münster, Germany
| | | | - Peer Kirsch
- Integrated Circuit Materials R&D Germany, Merck KGaA, Frankfurter Strasse 250, 64293, Darmstadt, Germany
| | - Günter Haufe
- Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, 48149, Münster, Germany
| |
Collapse
|
4
|
Cullis PM, Harger MJP, Lee M. Reexamination of the Evidence for Solvent-Induced Intramolecular Electrophilic Catalysis by a cis Vicinal Hydroxyl Group in Ribonucleoside Phosphorylation Reactions. Angew Chem Int Ed Engl 2000; 39:4245-4247. [PMID: 29711906 DOI: 10.1002/1521-3773(20001201)39:23<4245::aid-anie4245>3.0.co;2-k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Paul M Cullis
- Department of Chemistry University of Leicester Leicester, LE1 7RH, UK, Fax: (+44) 116-2523789
| | - Martin J P Harger
- Department of Chemistry University of Leicester Leicester, LE1 7RH, UK, Fax: (+44) 116-2523789
| | - Michael Lee
- Department of Chemistry University of Leicester Leicester, LE1 7RH, UK, Fax: (+44) 116-2523789
| |
Collapse
|