Dynamics of proton, ion, molecule, and crystal lattice in functional molecular assemblies

2021 ◽  
Author(s):  
Tomoyuki Akutagawa ◽  
Takashi Takeda ◽  
Norihisa Hoshino
Keyword(s):  
Crystal Lattice ◽  
Long Range ◽  
Molecular Assembly ◽  
Molecular Processes ◽  
Molecular Assemblies ◽  
Electrical Conducting ◽  
Molecular Rotations

Dynamic molecular processes, such as short- or long-range proton (H+) and ion (M+) motions, and molecular rotations in electrical conducting and magnetic molecular assembly enable to fabricate the electron –...

ChemInform Abstract: Chromium-Induced Molecular Assemblies and Long Range Ordering in Collagenous Tissues: A Conceptual Insight into Chromium Tanning

ChemInform ◽  
2010 ◽  
Vol 30 (29) ◽  
pp. no-no
Author(s):  
R. Gayatri ◽  
Rama Rajaram ◽  
Balachandran Unni Nair ◽  
F. Chandrasekaran ◽  
T. Ramasami
Keyword(s):  
Long Range ◽  
Molecular Assemblies ◽  
Long Range Ordering ◽  
Collagenous Tissues ◽  
Insight Into

scholarly journals Controlling Molecular Assembly and Charge Transport of N-Type Organic Semiconductors with Sterically Demanding Substituents

2020 ◽  
Author(s):  
Craig Yu ◽  
Naoya Kojima ◽  
Shohei Kumagai ◽  
Tadanori Kurosawa ◽  
Hiroyuki Ishii ◽  
...  
Keyword(s):  
Charge Transport ◽  
Organic Semiconductors ◽  
Field Effect Transistors ◽  
Molecular Assembly ◽  
Fine Tuning ◽  
Organic Field Effect Transistors ◽  
Molecular Assemblies ◽  
Design And Synthesis ◽  
Sterically Demanding ◽  
The Difference

Abstract Benzo[de]isoquinolino[1,8-gh]quinolinetetracarboxylic diimide (BQQDI) n-type organic semiconductors demonstrate unique multi-fold intermolecular hydrogen-bonding interactions that lead to excellent aggregated structures, charge transports, and electron mobility. However, the robust intermolecular anchoring of BQQDI presents challenges for further fine-tuning molecular assemblies and organic semiconductor properties. Herein, we report the design and synthesis of two BQQDI derivatives with sterically demanding phenyl- and cyclohexyl-substituted BQQDI (Ph–BQQDI and Cy6–BQQDI), where the two organic semiconductors show distinct molecular assemblies and degrees of intermolecular orbital overlaps. In addition, the difference in their packing motifs led to strikingly different band structures that give rise to contrasting charge-transport capabilities. As a result, Cy6–BQQDI shows excellent transistor performances in both single-crystalline and polycrystalline thin-film organic field-effect transistors.

scholarly journals Reactivity and selectivity modulation within a molecular assembly: recent examples from photochemistry

2021 ◽  
Author(s):  
Yeshua Sempere ◽  
Martin Morgenstern ◽  
Thorsten Bach ◽  
Manuel Plaza
Keyword(s):  
Organic Synthesis ◽  
Weak Interactions ◽  
Research Effort ◽  
Molecular Assembly ◽  
Photochemical Reactions ◽  
Host Molecule ◽  
Major Research ◽  
Molecular Assemblies ◽  
Unique Outcome

AbstractIn recent years, photochemical reactions have emerged as powerful transformations which significantly expand the repertoire of organic synthesis. However, a certain lack of selectivity can hamper their application and limit their scope. In this context, a major research effort continues to focus on an improved control over stereo- and chemoselectivity that can be achieved in molecular assemblies between photosubstrates and an appropriate host molecule. In this tutorial review, some recent, representative examples of photochemical reactions have been collected whose unique outcome is dictated by the formation of a molecular assembly driven by non-covalent weak interactions. Graphical Abstract

scholarly journals Long-range crystal-lattice distortion fields of epitaxial Ge-Sb-Te phase-change materials (Phys. Status Solidi B 4/2014)

2014 ◽  
Vol 251 (4) ◽  
Author(s):  
Ferhat Katmis ◽  
Martin Schmidbauer ◽  
Sergiy M. Bokoch ◽  
Peter Rodenbach ◽  
Henning Riechert ◽  
...  
Keyword(s):  
Phase Change ◽  
Crystal Lattice ◽  
Long Range ◽  
Phase Change Materials ◽  
Lattice Distortion ◽  
Crystal Lattice Distortion

A Step Towards a [2.2]Paracyclophane: A Single Crystal to Single Crystal Reaction Involving a Hydrogen-Bonded Molecular Assembly with Multiple Reaction Centres

2006 ◽  
Vol 59 (9) ◽  
pp. 613 ◽  
Author(s):  
Tomislav Friščić ◽  
Leonard R. MacGillivray
Keyword(s):  
Solid State ◽  
Single Crystal ◽  
Absorption Edge ◽  
Molecular Assembly ◽  
Solid State Synthesis ◽  
State Transformation ◽  
Molecular Assemblies ◽  
Solid State Transformation ◽  
Reaction Centres ◽  
Hydrogen Bonded

A single crystal to single crystal [2+2] photodimerization has been achieved within a molecular cocrystal composed of finite, hydrogen-bonded molecular assemblies using the absorption-edge irradiation technique. The cocrystal is composed of a resorcinol template and a diolefin reactant that reacts to form a non-symmetrical cyclobutane product. The product is an intermediate in a two-step solid-state synthesis of a [2.2]paracyclophane. The ability to conduct the reaction in a single crystal to single crystal fashion attests to the robustness of the hydrogen-bonded assemblies during the course of the solid-state transformation.

scholarly journals Manifold Dynamic Non-Covalent Interactions for Steering Molecular Assembly and Cyclization

2021 ◽  
Author(s):  
Shaotang Song ◽  
Jie Su ◽  
Lulu Wang ◽  
Zhen Xu ◽  
Chia-Hsiu Hsu ◽  
...  
Keyword(s):  
Real Space ◽  
Molecular Assembly ◽  
Biological Processes ◽  
Chemical Transformations ◽  
Molecular Assemblies ◽  
Non Covalent Interactions ◽  
Covalent Interactions ◽  
Space Characterization

Deciphering rich non-covalent interactions that govern many chemical and biological processes is crucial for the design of drugs and controlling molecular assemblies and their chemical transformations. However, real-space characterization of...

scholarly journals Dissection of molecular assembly dynamics by tracking orientation and position of single molecules in live cells

2016 ◽  
Author(s):  
Shalin B. Mehta ◽  
Molly McQuilken ◽  
Patrick La Riviere ◽  
Patricia Occhipinti ◽  
Amitabh Verma ◽  
...  
Keyword(s):  
Single Molecule ◽  
Fluorescence Polarization ◽  
Single Molecules ◽  
Living Cells ◽  
Molecular Assembly ◽  
Higher Order ◽  
Actin Network ◽  
Molecular Assemblies ◽  
Position And Orientation ◽  
Orientation Of Molecules

AbstractRegulation of order, such as orientation and conformation, drives the function of most molecular assemblies in living cells, yet remains difficult to measure accurately through space and time. We built an instantaneous fluorescence polarization microscope, which simultaneously images position and orientation of fluorophores in living cells with single-molecule sensitivity and a time resolution of 100ms. We developed image acquisition and analysis methods to track single particles that interact with higher-order assemblies of molecules. We tracked the fluctuations in position and orientation of molecules from the level of an ensemble of fluorophores down to single fluorophores. We tested our system in vitro using fluorescently labeled DNA and F-actin in which the ensemble orientation of polarized fluorescence is known. We then tracked the orientation of sparsely labeled F-actin network at the leading edge of migrating human keratinocytes, revealing the anisotropic distribution of actin filaments relative to the local retrograde flow of the F-actin network. Additionally, we analyzed the position and orientation of septin-GFP molecules incorporated in septin bundles in growing hyphae of a filamentous fungus. Our data indicate that septin-GFP molecules undergo positional fluctuations within, ∼350nm of the binding site and angular fluctuations within ∼30° of the central orientation of the bundle. By reporting position and orientation of molecules while they form dynamic higher-order structures, our approach can provide new insights into how micron-scale ordered assemblies emerge from nanoscale molecules in living cells.Significance StatementIn living cells, the 3D architecture of molecular assemblies such as chromosomes, lipid bilayers, and the cytoskeleton is regulated through the interaction among their component molecules. Monitoring the position and orientation of constituent molecules is important for understanding the mechanisms that govern the structure and function of these assemblies. We have developed an instantaneous fluorescence polarization microscope to track the position and orientation of fluorescently labeled particles, including single molecules, which form micron-scale macromolecular assemblies in living cells. Our imaging approach is broadly applicable to the study of dynamic molecular interactions that underpin the function of micron-scale assemblies in living cells.

scholarly journals Tubular and lamellar hydrogen-bonding molecular assemblies of isophthalic acid derivatives bearing a –CONHCnH2n+1 chain

RSC Advances ◽  
2018 ◽  
Vol 8 (39) ◽  
pp. 22250-22258 ◽  
Author(s):  
Chao Lv ◽  
Takashi Takeda ◽  
Norihisa Hoshino ◽  
Tomoyuki Akutagawa
Keyword(s):  
Hydrogen Bonding ◽  
Liquid Crystal ◽  
Isophthalic Acid ◽  
Molecular Assembly ◽  
Crystal Formation ◽  
Molecular Assemblies

Isophthalic acid derivatives (CnIP), bearing alkylamide chains at the 5-position that can participate in hydrogen bonding, were prepared and evaluated for their hydrogen-bonding molecular assembly structures for organogelation and liquid crystal formation.

Exact discretization of non-commutative space-time

2020 ◽  
Vol 35 (16) ◽  
pp. 2050135
Author(s):  
V. E. Tarasov
Keyword(s):  
Crystal Lattice ◽  
Long Range ◽  
Finite Differences ◽  
Star Product ◽  
Space Time ◽  
Range Interaction ◽  
Long Range Interaction ◽  
Commutative Space ◽  
Discrete Operators ◽  
Derivatives Of

Non-commutative space-time is discussed for discrete case. An exact discretization of the non-commutative space-time is proposed. New discrete operators, which satisfy the same algebraic relations as standard derivatives of integer orders, are used. Exact discretization of the non-commutative space-time is suggested by using generalization of the star-product (the Moyal–Weyl product) based on the recently proposed exact finite differences. The suggested discrete non-commutative space-time corresponds to the standard “continuous” non-commutative space-time without any approximations. The suggested discrete non-commutative space-time can be interpreted as a special physical (crystal) lattice with long-range interaction.

scholarly journals Rapid controlled release by photo-irradiation using morphological changes in micelles formed by amphiphilic lophine dimers

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Masaaki Akamatsu ◽  
Kazuki Kobayashi ◽  
Hiroki Iwase ◽  
Yoshifumi Sakaguchi ◽  
Risa Tanaka ◽  
...  
Keyword(s):  
Controlled Release ◽  
Morphological Changes ◽  
Molecular Assembly ◽  
Active Components ◽  
Molecular Assemblies ◽  
On Demand ◽  
Photoresponsive Surfactants ◽  
Rapid Control ◽  
Ultraviolet Light Irradiation ◽  
Model Drug

AbstractPhoto-induced rapid control of molecular assemblies, such as micelles and vesicles, enables effective and on-demand release of drugs or active components, with applications such as drug delivery systems (DDS) and cosmetics. Thus far, no attempts to optimize the responsiveness of photoresponsive molecular assemblies have been published. We previously reported photoresponsive surfactants bearing a lophine dimer moiety that exhibit fast photochromism in confined spaces, such as inside a molecular assembly. However, rapid control of the micelle structures and solubilization capacity have not yet been demonstrated. In the present work, photo-induced morphological changes in micelles were monitored using in-situ small-angle neutron scattering (SANS) and UV/Vis absorption spectroscopy. An amphiphilic lophine dimer (3TEG-LPD) formed elliptical micelles. These were rapidly elongated by ultraviolet light irradiation, which could be reversed by dark treatment, both within 60 s. For a solution of 3TEG-LPD micelles solubilizing calcein as a model drug molecule, fluorescence and SANS measurements indicated rapid release of the incorporated calcein into the bulk solvent under UV irradiation. Building on these results, we investigated rapid controlled release via hierarchical chemical processes: photoisomerization, morphological changes in the micelles, and drug release. This rapid controlled release system allows for effective and on-demand DDS.

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