Cyclic aromatic imides as a potential class of molecules for supramolecular interactions

CrystEngComm ◽  
2015 ◽  
Vol 17 (45) ◽  
pp. 8575-8595 ◽  
Author(s):  
Jayanta K. Nath ◽  
Jubaraj B. Baruah
Keyword(s):  
Molecular Level ◽  
Soft Materials ◽  
Building Blocks ◽  
Supramolecular Interactions ◽  
Stacking Interactions

Prospects of stacking interactions of imides beneficial to generation of new soft materials are projected by analysing examples of primary building blocks that provide a basis for understanding at the molecular level.

scholarly journals Influence of perylenediimide–pyrene supramolecular interactions on the stability of DNA-based hybrids: Importance of electrostatic complementarity

2014 ◽  
Vol 10 ◽  
pp. 1589-1595 ◽  
Author(s):  
Christian B Winiger ◽  
Simon M Langenegger ◽  
Oleg Khorev ◽  
Robert Häner
Keyword(s):  
Double Helix ◽  
Building Blocks ◽  
Supramolecular Interactions ◽  
Stacking Interactions ◽  
Average Value ◽  
Π Stacking ◽  
Dna Strands ◽  
Polycyclic Aromatic ◽  
The Stability ◽  
Dna Double Helix

Aromatic π–π stacking interactions are ubiquitous in nature, medicinal chemistry and materials sciences. They play a crucial role in the stacking of nucleobases, thus stabilising the DNA double helix. The following paper describes a series of chimeric DNA–polycyclic aromatic hydrocarbon (PAH) hybrids. The PAH building blocks are electron-rich pyrene and electron-poor perylenediimide (PDI), and were incorporated into complementary DNA strands. The hybrids contain different numbers of pyrene–PDI interactions that were found to directly influence duplex stability. As the pyrene–PDI ratio approaches 1:1, the stability of the duplexes increases with an average value of 7.5 °C per pyrene–PDI supramolecular interaction indicating the importance of electrostatic complementarity for aromatic π–π stacking interactions.

Stress-responsive properties of metallocenes in metallopolymers

2021 ◽  
Author(s):  
Ye Sha ◽  
Hao Zhang ◽  
Zhou Zhou ◽  
Zhenyang Luo
Keyword(s):  
Molecular Level ◽  
Building Blocks ◽  
Review Article ◽  
Stress Responsiveness

This review article combines the field of metallopolymers and stress-responsiveness on a molecular level, namely, metallocenes, as emerging stress-responsive building blocks for materials.

scholarly journals Mechanochemistry unveils stress transfer during sacrificial bond fracture of tough multiple network elastomers

2021 ◽  
Author(s):  
Yinjun Chen ◽  
Gabriel Sanoja ◽  
Costantino Creton
Keyword(s):  
Molecular Level ◽  
Stress Transfer ◽  
Soft Materials ◽  
Multiple Network

The molecular level transfer of stress from a stiff percolating filler to a stretchable matrix is a crucial and generic mechanism of toughening in soft materials.

scholarly journals Revealing the chirality origin and homochirality crystallization of Ag14 nanocluster at the molecular level

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xiao-Qian Liang ◽  
Ying-Zhou Li ◽  
Zhi Wang ◽  
Shan-Shan Zhang ◽  
Yi-Cheng Liu ◽  
...  
Keyword(s):  
Molecular Level ◽  
Spontaneous Resolution ◽  
Silver Nanoclusters ◽  
Supramolecular Interactions ◽  
Hydrogen Atoms ◽  
Special Effects ◽  
Π Stacking Interaction ◽  
Origin Of Chirality ◽  
Present Characteristic ◽  
Aromatic Hydrogen

AbstractAlthough chirality is an ever-present characteristic in biology and some artificial molecules, controlling the chirality and demystifying the chirality origin of complex assemblies remain challenging. Herein, we report two homochiral Ag14 nanoclusters with inherent chirality originated from identical rotation of six square faces on a Ag8 cube driven by intra-cluster π···π stacking interaction between pntp− (Hpntp = p-nitrothiophenol) ligands. The spontaneous resolution of the racemic (SD/rac-Ag14a) to homochiral nanoclusters (SD/L-Ag14 and SD/R-Ag14) can be realized by re-crystallizing SD/rac-Ag14a in acetonitrile, which promotes the homochiral crystallization in solid state by forming C–H···O/N hydrogen bonds with nitro oxygen atoms in pntp− or aromatic hydrogen atoms in dpph (dpph = 1,6-bis(diphenylphosphino)hexane) on Ag14 nanocluster. This work not only provides strategic guidance for the syntheses of chiral silver nanoclusters in an all-achiral environment, but also deciphers the origin of chirality at molecular level by identifying the special effects of intra- and inter-cluster supramolecular interactions.

scholarly journals 2-Oxo-2H-chromen-7-yl 4-methylbenzoate

IUCrData ◽  
2018 ◽  
Vol 3 (7) ◽  
Author(s):  
Abdoulaye Djandé ◽  
Akoun Abou ◽  
Félix Kini ◽  
Konan René Kambo ◽  
Michel Giorgi
Keyword(s):  
Hydrogen Bond ◽  
Title Compound ◽  
Acute Angle ◽  
Membered Ring ◽  
Hirshfeld Surface ◽  
Supramolecular Interactions ◽  
Stacking Interactions ◽  
Weak Hydrogen Bond ◽  
Compound C ◽  
Benzene Rings

In the title compound, C17H12O4, the benzoate ring is oriented at an acute angle of 60.14 (13)° relative to the coumarin plane (r.m.s. deviation = 0.006 Å). This conformation is stabilized by an intramolecular C—H...O weak hydrogen bond, which forms a five-membered ring. Also present are π–π stacking interactions between neighbouring pyrone and benzene rings [centroid-to-centroid distances in the range 3.6286 (1)–3.6459 (1) Å] and C=O...π interactions [O...centroid distances in the range 3.2938 (1)–3.6132 (1) Å]. Hirshfeld surface analysis has been used to confirm and quantify the supramolecular interactions.

scholarly journals Smart covalent organic networks (CONs) with “on-off-on” light-switchable pores for molecular separation

2020 ◽  
Vol 6 (34) ◽  
pp. eabb3188 ◽  
Author(s):  
Jiangtao Liu ◽  
Shaofei Wang ◽  
Tiefan Huang ◽  
Priyanka Manchanda ◽  
Edy Abou-Hamad ◽  
...  
Keyword(s):  
Visible Light ◽  
Molecular Level ◽  
Uv Light ◽  
Building Blocks ◽  
Membrane Selectivity ◽  
Molecular Separation ◽  
Stimuli Response ◽  
Dye Rejection ◽  
New Generation ◽  
Azobenzene Derivatives

Development of the new-generation membranes for tunable molecular separation requires materials with abilities beyond strict separation. Stimuli response could remotely adjust the membrane selectivity. Azobenzene derivatives can be photo-switched between trans and cis isomers under ultraviolet or visible light. Here, the azobenzenes were implanted as light switches to bridge the flexible cyclen building blocks. The smart covalent organic network membranes fold and unfold as origami that can be photo-switched between on-state (large) and off-state (small) pores. The cis membranes with off state under ultraviolet (UV) light have higher dye rejection than trans membranes with on-state channels. By controlling the trans-to-cis azobenzene isomerization via UV/Vis light, the pore size can be remotely controlled at the molecular level and the solvent permeance and dye rejection can be dynamically tuned.

scholarly journals Protein Supramolecular Structures: From Self-Assembly to Nanovaccine Design

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 1008 ◽  
Author(s):  
Ximena Zottig ◽  
Mélanie Côté-Cyr ◽  
Dominic Arpin ◽  
Denis Archambault ◽  
Steve Bourgault
Keyword(s):  
Immune Responses ◽  
Self Assembly ◽  
Molecular Level ◽  
Supramolecular Structures ◽  
Atomic Scale ◽  
Supramolecular Interactions ◽  
Protein Assemblies ◽  
Adaptive Immune ◽  
Self Assembling ◽  
Molecular Specificity

Life-inspired protein supramolecular assemblies have recently attracted considerable attention for the development of next-generation vaccines to fight against infectious diseases, as well as autoimmune diseases and cancer. Protein self-assembly enables atomic scale precision over the final architecture, with a remarkable diversity of structures and functionalities. Self-assembling protein nanovaccines are associated with numerous advantages, including biocompatibility, stability, molecular specificity and multivalency. Owing to their nanoscale size, proteinaceous nature, symmetrical organization and repetitive antigen display, protein assemblies closely mimic most invading pathogens, serving as danger signals for the immune system. Elucidating how the structural and physicochemical properties of the assemblies modulate the potency and the polarization of the immune responses is critical for bottom-up design of vaccines. In this context, this review briefly covers the fundamentals of supramolecular interactions involved in protein self-assembly and presents the strategies to design and functionalize these assemblies. Examples of advanced nanovaccines are presented, and properties of protein supramolecular structures enabling modulation of the immune responses are discussed. Combining the understanding of the self-assembly process at the molecular level with knowledge regarding the activation of the innate and adaptive immune responses will support the design of safe and effective nanovaccines.

Coordination Polymers with a Bulky Perylene-Based Tetracarboxylate Ligand: Syntheses, Crystal Structures, and Luminescent Properties

2010 ◽  
Vol 63 (3) ◽  
pp. 463 ◽  
Author(s):  
Chun-Sen Liu ◽  
Min Hu ◽  
Song-Tao Ma ◽  
Qiang Zhang ◽  
Li-Ming Zhou ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Three Dimensional ◽  
Luminescent Properties ◽  
Supramolecular Interactions ◽  
Polymeric Chain ◽  
Stacking Interactions ◽  
One Dimensional ◽  
Π Stacking ◽  
Higher Dimensional ◽  
Interchain Interactions

To explore the coordination possibilities of perylene-based ligands with a larger conjugated π-system, four ZnII, MnII, and CoII coordination polymers with perylene-3,4,9,10-tetracarboxylate (ptc) and the chelating 1,10-phenanthroline (phen) ligands were synthesized and characterized: {[Zn2(ptc)(phen)2](H2O)10}∞ (1), {[Zn3(ptc)(OH)2(phen)2](H2O)3}∞ (2), {[Mn(ptc)0.5(phen)(H2O)2](H2O)1.5}∞ (3), and {[Co(ptc)0.5(phen)(H2O)2](H2O)2.5}∞ (4). Structural analysis reveals that complexes 1 and 2 both take one-dimensional polymeric chain structures with dinuclear and trinuclear units as nodes, respectively, which are further extended via the accessorial secondary interchain interactions, such as C–H···O H-bonding or aromatic π···π stacking interactions, to give rise to the relevant higher-dimensional frameworks. Compound 3 has a two-dimensional sheet structure that is further assembled to form a three-dimensional framework by interlayer π···π stacking interactions. Complex 4 is a one-dimensional ribbon-like array structure that is interlinked by the co-effects of intermolecular π···π stacking and C–H···π supramolecular interactions, resulting in a higher-dimensional framework from the different crystallographic directions. Moreover, complexes 1–4 exhibit strong solid-state luminescence emissions at room temperature, which mainly originate from intraligand π→π* transitions of ptc.

scholarly journals Recent advances in biomimetic sensing technologies

2009 ◽  
Vol 367 (1893) ◽  
pp. 1559-1569 ◽  
Author(s):  
E.A.C Johnson ◽  
R.H.C Bonser ◽  
G Jeronimidis
Keyword(s):  
Mechanical Properties ◽  
Molecular Level ◽  
Building Blocks ◽  
Biological Materials ◽  
Science And Engineering ◽  
Innovative Technologies ◽  
Engineering Community ◽  
Levels Of Organization ◽  
New Generation ◽  
Development Structure

The importance of biological materials has long been recognized from the molecular level to higher levels of organization. Whereas, in traditional engineering, hardness and stiffness are considered desirable properties in a material, biology makes considerable and advantageous use of softer, more pliable resources. The development, structure and mechanics of these materials are well documented and will not be covered here. The purpose of this paper is, however, to demonstrate the importance of such materials and, in particular, the functional structures they form. Using only a few simple building blocks, nature is able to develop a plethora of diverse materials, each with a very different set of mechanical properties and from which a seemingly impossibly large number of assorted structures are formed. There is little doubt that this is made possible by the fact that the majority of biological ‘materials’ or ‘structures’ are based on fibres and that these fibres provide opportunities for functional hierarchies. We show how these structures have inspired a new generation of innovative technologies in the science and engineering community. Particular attention is given to the use of insects as models for biomimetically inspired innovations.

scholarly journals Understanding the ionic liquid [NC4111][NTf2] from individual building blocks: an IR-spectroscopic study

2015 ◽  
Vol 17 (13) ◽  
pp. 8518-8529 ◽  
Author(s):  
Kenny Hanke ◽  
Matin Kaufmann ◽  
Gerhard Schwaab ◽  
Martina Havenith ◽  
Conrad T. Wolke ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Spectroscopic Study ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Molecular Level ◽  
Building Blocks ◽  
Spectroscopic Methods ◽  
Ir Spectroscopic

This study uses complementary spectroscopic methods in combination with quantum chemical calculations to explore at a molecular level the ionic liquid [NC4111][NTf2] from single ions to the bulk.

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