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Search for "pH-responsive systems" in Full Text gives 2 result(s) in Beilstein Journal of Organic Chemistry.

Switchable molecular tweezers: design and applications

Pablo Msellem,
Maksym Dekthiarenko,
Nihal Hadj Seyd and
Guillaume Vives

Beilstein J. Org. Chem. 2024, 20, 504–539, doi:10.3762/bjoc.20.45

and drug delivery systems [12]. pH-Responsive molecular tweezers A particular case of coordination-responsive systems is when a proton is used as a stimulus leading to pH-responsive systems with the protonation/deprotonation of the switchable moiety. The conformational switch in these systems is

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Graphical Abstract

Figure 1: Principle of switchable molecular tweezers.

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Figure 2: Principle of pH-switchable molecular tweezers 1 [19].

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Figure 3: a) pH-Switchable tweezers 2 substituted with alkyl chains as switchable lipids. b) Schematic depict...

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Figure 4: Modification of spectral properties of 3 by controlled induction of Pt–Pt interactions.

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Figure 5: Conformational switching of di(hydroxyphenyl)pyrimidine-based tweezer 4 upon alkylation or fluoride...

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Figure 6: Hydrazone-based pH-responsive tweezers 5 for mesogenic modulation.

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Figure 7: pH-Switchable molecular tweezers 6 bearing acridinium moieties.

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Figure 8: a) Terpyridine and pyridine-hydrazone-pyridine analogs molecular tweezers and b) extended pyridine ...

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Figure 9: Terpyridine-based molecular tweezers with M–salphen arms and their field of application. Figure 9 was adapt...

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Figure 10: a) Terpyridine-based molecular tweezers for diphosphate recognition [48]; b) bishelicene chiroptical te...

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Figure 11: Terpyridine-based molecular tweezers with allosteric cooperative binding.

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Figure 12: Terpyridine-based molecular tweezers presenting closed by default conformation.

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Figure 13: Pyridine-pyrimidine-pyridine-based molecular tweezers.

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Figure 14: Coordination-responsive molecular tweezers based on nitrogen-containing ligands.

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Figure 15: Molecular tweezers exploiting the remote bipyridine or pyridine binding to trigger the conformation...

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Figure 16: Bipyridine-based molecular tweezers exploiting the direct s-trans to s-cis-switching for a) anion b...

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Figure 17: a) Podand-based molecular tweezers [66,67]. b) Application of tweezers 32 for the catalytic allosteric reg...

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Figure 18: Anion-triggered molecular tweezers based on calix[4]pyrrole.

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Figure 19: Anion-triggered molecular tweezers.

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Figure 20: a) Principle of the weak link approach (WLA) developed by Mirkin and its application to b) symmetri...

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Figure 21: Molecular tweezers as allosteric catalyst in asymmetric epoxide opening [80].

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Figure 22: Allosteric regulation of catalytic activity in ring-opening polymerization with double tweezers 41.

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Figure 23: a) Conformational switching of 42 by intramolecular –S–S– bridge formation. b) Shift of conformatio...

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Figure 24: a) Redox-active glycoluril-TTF tweezers 44. b) Mechanism of stepwise oxidation of said tweezers wit...

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Figure 25: Mechanism of formation of the mixed-valence dimers of tweezers 45.

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Figure 26: Mechanism of carbohydrate liberation upon redox-mediated conformation switching of 46.

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Figure 27: a) The encapsulation properties of 47 as well as the DCTNF release process from its host–guest comp...

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Figure 28: Redox-active bipyridinium-based tweezers. a) With a ferrocenyl hinge 49, b) with a propyl hinge 50 ...

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Figure 29: Redox-active calix[4]arene porphyrin molecular tweezers.

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Figure 30: a) Mechanism of the three orthogonal stimuli. b) Cubic scheme showing the eight different states of ...

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Figure 31: Redox-controlled molecular gripper based on a diquinone resorcin[4]arene.

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Figure 32: a) Shinkai's butterfly tweezers and their different host–guest properties depending on the isomer. ...

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Figure 33: Cyclam-tethered tweezers and their different host–guest complexes depending on their configuration.

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Figure 34: Azobenzene-based catalytic tweezers.

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Figure 35: Photoswitchable PIEZO channel mimic.

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Figure 36: Stilbene-based porphyrin tweezers for fullerene recognition.

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Figure 37: Stiff-stilbene-based tweezers with urea or thiourea functional units for a) anion binding, b) anion...

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Figure 38: Feringa’s photoswitchable organocatalyst (a) and different catalyzed reactions with that system (b)....

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Figure 39: a) Irie and Takeshita’s thioindigo-based molecular tweezers. b) Family of hemithioindigo-based mole...

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Figure 40: Dithienylethylene crown ether-bearing molecular tweezers reported by Irie and co-workers.

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Review

Published 01 Mar 2024

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pH- and concentration-dependent supramolecular self-assembly of a naturally occurring octapeptide

Goutam Ghosh and
Gustavo Fernández

Beilstein J. Org. Chem. 2020, 16, 2017–2025, doi:10.3762/bjoc.16.168

development of novel drug nanocarrier assemblies. Keywords: aqueous self-assembly; pH-responsive systems; secondary structure; self-assembled nanostructures; solid-phase peptide synthesis; Introduction The self-assembly of small molecules is a ubiquitous phenomenon in nature [1] and also has key

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Scheme 1: Detailed synthetic scheme for PEP-1. (i) 20% piperidine in DMF, (ii) HBTU, (iii) NMM, (iv) Ac₂O/Py/...

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Figure 1: a) CD spectrum; b) FTIR spectrum of the amide I region; and c) ThT fluorescence assay of PEP-1 in P...

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Figure 2: AFM height (a and b) and corresponding phase images (c and d) of PEP-1 at pH 7.4 on mica (c = 5.0 ×...

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Figure 3: a) pH-dependent CD spectra of PEP-1. b) AFM height image at pH 5.5; c) at pH 13.0; and d) correspon...

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Figure 4: CD spectrum of PEP-1 at different concentrations at pH 7.4.

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Full Research Paper

Published 17 Aug 2020

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