Solvatochromic, thermochromic and pH-sensory DCDHF-hydrazone molecular switch: response to alkaline analytes

RSC Advances ◽  
2016 ◽  
Vol 6 (104) ◽  
pp. 102296-102305 ◽  
Author(s):  
Tawfik A. Khattab ◽  
Brylee David B. Tiu ◽  
Sonya Adas ◽  
Scott D. Bunge ◽  
Rigoberto C. Advincula
Keyword(s):  
Molecular Switches ◽  
Molecular Switch ◽  
Stimuli Responsive

Nanostructures fabricated from multi-stimuli responsive DCDHF-hydrazone molecular switches to function as colorimetric reversible gas probes.

scholarly journals Exploring the pH-dependent kinetics, thermodynamics and photochemistry of a flavylium-based pseudorotaxane

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Rita Anastácio ◽  
André Seco ◽  
Pedro Mateus ◽  
A. Jorge Parola ◽  
Nuno Basílio
Keyword(s):  
Time Scales ◽  
Reaction Network ◽  
Molecular Switches ◽  
Molecular Switch ◽  
Stimuli Responsive ◽  
Ph Dependent ◽  
Molecular Components ◽  
Different Time Scales

Abstract Flavylium-based molecular switches are attractive molecular components to devise stimuli-responsive host-guest systems such as rotaxanes and pseudorotaxanes. These compounds display a pH-dependent reaction network of several species that reversibly interconvert within different time scales. Therefore, to explore and take profit of exceptional stimuli-responsive properties of these systems, detailed kinetic and thermodynamic characterizations are often required. In this work, we present the results of such characterization for a new flavylium compound decorated with a trimethylalkylammonium substituent designed to form a pseudorotaxane with cucurbit[7]uril (CB7). The formation of the pseudorotaxane was characterized in detail, and the thermodynamic and kinetic aspects of the flavylium interconversion reactions in the assembly were investigated and compared with the free molecular switch.

scholarly journals Redox-triggered switching in three-dimensional covalent organic frameworks

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Chao Gao ◽  
Jian Li ◽  
Sheng Yin ◽  
Junliang Sun ◽  
Cheng Wang
Keyword(s):  
Solid State ◽  
Three Dimensional ◽  
Molecular Switches ◽  
Pore Channel ◽  
Pore Surface ◽  
Stimuli Responsive ◽  
Conversion Yield ◽  
Responsive Materials ◽  
Reversible Transformation ◽  
Internal Pore

Abstract The tuning of molecular switches in solid state toward stimuli-responsive materials has attracted more and more attention in recent years. Herein, we report a switchable three-dimensional covalent organic framework (3D COF), which can undergo a reversible transformation through a hydroquinone/quinone redox reaction while retaining the crystallinity and porosity. Our results clearly show that the switching process gradually happened through the COF framework, with an almost quantitative conversion yield. In addition, the redox-triggered transformation will form different functional groups on the pore surface and modify the shape of pore channel, which can result in tunable gas separation property. This study strongly demonstrates 3D COFs can provide robust platforms for efficient tuning of molecular switches in solid state. More importantly, switching of these moieties in 3D COFs can remarkably modify the internal pore environment, which will thus enable the resulting materials with interesting stimuli-responsive properties.

Photo- and electro-chromic organometallics with dithienylethene (DTE) linker, L2CpM-DTE-MCpL2: Dually stimuli-responsive molecular switch

2011 ◽  
Vol 40 (40) ◽  
pp. 10643 ◽  
Author(s):  
Keiko Motoyama ◽  
Huifang Li ◽  
Takashi Koike ◽  
Makoto Hatakeyama ◽  
Satoshi Yokojima ◽  
...  
Keyword(s):  
Molecular Switch ◽  
Stimuli Responsive

Dinuclear ruthenium acetylide complexes with diethynylated anthrahydroquinone and anthraquinone frameworks: a multi-stimuli-responsive organometallic switch

2019 ◽  
Vol 48 (21) ◽  
pp. 7432-7441
Author(s):  
Yousuke Oyama ◽  
Reo Kawano ◽  
Yuya Tanaka ◽  
Munetaka Akita
Keyword(s):  
Molecular Switch ◽  
Stimuli Responsive ◽  
Dinuclear Ruthenium

The organometallic AcAHQ/AQ-Ru system turns out to be an effective redox and pH stimuli triggered bimodal molecular switch.

scholarly journals Template-Free Synthesis of a Phenanthroline-Containing [2]Rotaxane: A Reversible pH-Controllable Molecular Switch

Symmetry ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1137
Author(s):  
Muraoka ◽  
Aoyama ◽  
Fujihara ◽  
Yamane ◽  
Hisaki ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Molecular Switches ◽  
Molecular Switch ◽  
Molecular Sensors ◽  
Template Free

The synthesis of symmetric and asymmetric rotaxanes consisting of neutral axle and ring components without ionic templates is necessary for applications in molecular sensors and molecular switches. A phenanthroline-containing symmetric [2]rotaxane was newly synthesized by inducing hydrogen bonding and π-interaction using a template-free threading-followed-by-stoppering method. The obtained rotaxane serves as a reversible pH-controllable molecular switch.

Synthesis and self-assembly of photoacid-containing block copolymers based on 1-naphthol

2019 ◽  
Vol 10 (41) ◽  
pp. 5602-5616 ◽  
Author(s):  
Felix Wendler ◽  
Jessica C. Tom ◽  
Felix H. Schacher
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Molecular Switches ◽  
Amphiphilic Block Copolymers ◽  
Strong Increase ◽  
Stimuli Responsive ◽  
Responsive Materials

Photoacids experience a strong increase in acidity when absorbing light and, hence, can be considered as molecular switches. The incorporation into amphiphilic block copolymers leads to novel stimuli-responsive materials with great potential.

scholarly journals A multi-stimuli responsive switch as a fluorescent molecular analogue of transistors

2016 ◽  
Vol 7 (3) ◽  
pp. 1819-1825 ◽  
Author(s):  
Iluminada Gallardo ◽  
Gonzalo Guirado ◽  
Jordi Hernando ◽  
Sandy Morais ◽  
Gemma Prats
Keyword(s):  
Molecular Switch ◽  
Stimuli Responsive

A redox-interconverting molecular switch is reported that enables continuous thermal amplification of its fluorescence, thus mimicking the response of transistors.

A methyl ketone bridged molecule as a multi-stimuli-responsive color switch for electrochromic devices

2016 ◽  
Vol 4 (21) ◽  
pp. 4662-4667 ◽  
Author(s):  
Yu-Mo Zhang ◽  
Fuli Xie ◽  
Wen Li ◽  
Yuyang Wang ◽  
Weiran Zhang ◽  
...  
Keyword(s):  
Near Infrared ◽  
Methyl Ketone ◽  
Molecular Switch ◽  
Electrochromic Device ◽  
Stimuli Responsive ◽  
Electrochromic Devices

A new multi-stimuli-responsive molecular switch M5 with a methyl ketone bridge has been developed to fabricate a visible-near infrared absorbing electrochromic device.

scholarly journals Analog Signalling with ‘Digital’ Molecular Switches

2018 ◽  
Author(s):  
Stephen E Clarke
Keyword(s):  
Synaptic Plasticity ◽  
Experimental Evidence ◽  
Stable State ◽  
Molecular Switches ◽  
Molecular Switch ◽  
Analog Signal ◽  
Input Frequency ◽  
Stable States ◽  
Short Timescale ◽  
Long Timescales

AbstractMolecular switches, such as the protein kinase CaMKII, play a fundamental role in cell signalling by decoding inputs into either high or low states of activity; because the high activation state can be turned on and persist after the input ceases, these switches have earned a reputation as ‘digital’. Although this on/off, binary perspective has been valuable for understanding long timescale synaptic plasticity, accumulating experimental evidence suggests that the CaMKII switch can also control plasticity on short timescales. To investigate this idea further, a non-autonomous, nonlinear ordinary differential equation, representative of a general bistable molecular switch, is analyzed. The results suggest that switch activity in regions surrounding either the high- or low-stable states of activation could act as a reliable analog signal, whose short timescale fluctuations relative to equilibrium track instantaneous input frequency. The model makes intriguing predictions and is validated against previous work demonstrating its suitability as a minimal representation of switch dynamics; in combination with existing experimental evidence, the theory suggests a multiplexed encoding of instantaneous frequency information over short timescales, with integration of total activity over long timescales.Author SummaryBistable molecular switches can decode cellular inputs into distinct high- or low-states of persistent enzymatic activity. Although this on-off, ‘digital’ perspective is valuable for long timescales, I suggest that short timescale fluctuations of switch activity around either stable state acts as an analog signal that reliably encodes instantaneous input frequency. A minimal model and theory make predictions about the molecular switch CaMKII, synaptic plasticity and burst detection.

scholarly journals Interfacial Charge Transfer Processes in 2D and 3D Semiconducting Hybrid Perovskites: Azobenzene as Photoswitchable Ligand

2019 ◽  
Author(s):  
Nicole Fillafer ◽  
Tobias Seewald ◽  
Lukas Schmidt-Mende ◽  
Sebastian Polarz
Keyword(s):  
Energy Transfer ◽  
Perovskite Phase ◽  
Molecular Switches ◽  
Head Group ◽  
Stimuli Responsive ◽  
Pi Conjugated ◽  
Hybrid Perovskite ◽  
Pi System ◽  
2D And 3D ◽  
Interfacial Charge

<p>In the vast majority of studies on semiconductor particles one uses ligands, respectively capping agents, which bind to the external surfaces of the particles and cover it with an electrically insulating shell. Since transport of charge carrier and/ or energy across interfaces is desirable for a large number of applications, the use of pi-conjugated ligands becomes more and more interesting. Among those, compounds which show stimuli-responsive properties, particularly molecular switches are fascinating, as one hopes to be able to adjust the properties of the interfaces by demand. However, how the properties of such special ligands get influenced by the presence of a semiconductor and vice-versa is under debate. Here, ammonium-modified azobenzene compounds were selected as prototypes for molecular switches and organic-inorganic hybrid perovskites on the semiconductor side. The class of ammonium-lead-halide phases as prototypes is special, because in addition to surface functionalization of 3D crystals, organic compounds can be truly incorporated into the crystal as 2D phases yielding, for example, layered Ruddelsden-Popper phases. We present photoswitchable azobenzene ligands with varying head group lengths for the synthesis of 2D and 3D hybrid perovskite phases. Energy transfer mechanisms are influenced by the length of the molecular spacer moiety, which determines the distance between the pi-system to the semiconductor surfaces. We find huge differences in the photoswitching behaviour between the free, surface coordinated versus ligands integrated inside perovskite layers. Photoswitching of azobenzene ligands incorporated to 2D phases is nearly quenched, while the same mechanism for coordinating ligands is greatly improved, compared to the free ligands. The improvement originates from an energy transfer from the perovskite to the azobenzene, which is strongly distance dependent. This study provides evidence for the photoswitching behaviour of azobenzene as ligand for hybrid perovskites and the dependence of the head group between a chromophore and the perovskite phase.</p>

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