Rational Design of a Ternary Supramolecular System: Self-Assembly of Pentanuclear Lanthanide Helicates

2011 ◽  
Vol 133 (28) ◽  
pp. 10764-10767 ◽  
Author(s):  
Badr El Aroussi ◽  
Soumaila Zebret ◽  
Céline Besnard ◽  
Philippe Perrottet ◽  
Josef Hamacek
Keyword(s):  
Self Assembly ◽  
Rational Design ◽  
Supramolecular System

Examining the structure of the mature amyloid fibril

2002 ◽  
Vol 30 (4) ◽  
pp. 521-525 ◽  
Author(s):  
O. S. Makin ◽  
L. C. Serpell
Keyword(s):  
Self Assembly ◽  
Rational Design ◽  
Amyloid Fibrils ◽  
Structural Information ◽  
X Ray ◽  
X Ray Crystallography ◽  
Cryo Electron Microscopy ◽  
Fibre Diffraction ◽  
Complementary Techniques ◽  
Mature Fibril

The pathogenesis of the group of diseases known collectively as the amyloidoses is characterized by the deposition of insoluble amyloid fibrils. These are straight, unbranching structures about 70–120 å (1 å = 0.1 nm) in diameter and of indeterminate length formed by the self-assembly of a diverse group of normally soluble proteins. Knowledge of the structure of these fibrils is necessary for the understanding of their abnormal assembly and deposition, possibly leading to the rational design of therapeutic agents for their prevention or disaggregation. Structural elucidation is impeded by fibril insolubility and inability to crystallize, thus preventing the use of X-ray crystallography and solution NMR. CD, Fourier-transform infrared spectroscopy and light scattering have been used in the study of the mechanism of fibril formation. This review concentrates on the structural information about the final, mature fibril and in particular the complementary techniques of cryo-electron microscopy, solid-state NMR and X-ray fibre diffraction.

scholarly journals Ag–Au Core–Shell Triangular Nanoprisms for Improving p-g-C3N4 Photocatalytic Hydrogen Production

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3347
Author(s):  
Yali Guo ◽  
Anzhou Xu ◽  
Juan Hou ◽  
Qingcui Liu ◽  
Hailong Li ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Self Assembly ◽  
Rational Design ◽  
Photogenerated Electron ◽  
Core Shell ◽  
Co Catalyst ◽  
Replacement Method ◽  
Assembly Method ◽  
Free Replacement ◽  
Electron Holes

Ag–Au core–shell triangular nanoprisms (Ag@Au TNPs) have aroused extensive research interest in the field of hydrogen evolution reaction (HER) due to their strong plasmon effect and stability. Here, Ag@Au TNPs were fabricated by the galvanic-free replacement method. Then, we loaded them on protonated g-C3N4 nanoprisms (P–CN) by the electrostatic self-assembly method as an efficient plasmonic photocatalyst for HER. The hydrogen production rate of Ag@Au TNPs/P–CN (4.52 mmol/g/h) is 4.1 times higher than that of P–CN (1.11 mmol/g/h) under simulated sunlight irradiation, making it the most competitive material for water splitting. The formed Schottky junction helps to trap the hot electrons generated from Ag@Au TNPs, and the well-preserved tips of the Ag@Au TNPs can effectively generate an electromagnetic field to inhibit the photogenerated electron–holes pairs recombination. This study suggests that the rational design of Ag@Au TNPs by the galvanic-free replacement method is an effective co-catalyst for HER and boosting the additional combination of plasmonic metals and catalyst metals for the enhancement to HER.

scholarly journals Controlling the length of porphyrin supramolecular polymers via coupled equilibria and dilution-induced supramolecular polymerization

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Elisabeth Weyandt ◽  
Luigi Leanza ◽  
Riccardo Capelli ◽  
Giovanni M. Pavan ◽  
Ghislaine Vantomme ◽  
...  
Keyword(s):  
Complex Systems ◽  
Self Assembly ◽  
Chiral Discrimination ◽  
Coarse Grained ◽  
Supramolecular Polymers ◽  
Supramolecular System ◽  
Precise Control ◽  
Aggregate Morphology ◽  
The Individual ◽  
Supramolecular Polymerization

AbstractMulti-component systems often display convoluted behavior, pathway complexity and coupled equilibria. In recent years, several ways to control complex systems by manipulating the subtle balances of interaction energies between the individual components have been explored and thereby shifting the equilibrium between different aggregate states. Here we show the enantioselective chain-capping and dilution-induced supramolecular polymerization with a Zn2+-porphyrin-based supramolecular system when going from long, highly cooperative supramolecular polymers to short, disordered aggregates by adding a monotopic Mn3+-porphyrin monomer. When mixing the zinc and manganese centered monomers, the Mn3+-porphyrins act as chain-cappers for Zn2+-porphyrin supramolecular polymers, effectively hindering growth of the copolymer and reducing the length. Upon dilution, the interaction between chain-capper and monomers weakens as the equilibria shift and long supramolecular polymers form again. This dynamic modulation of aggregate morphology and length is achieved through enantioselectivity in the aggregation pathways and concentration-sensitive equilibria. All-atom and coarse-grained molecular simulations provide further insights into the mixing of the species and their exchange dynamics. Our combined experimental and theoretical approach allows for precise control of molecular self-assembly and chiral discrimination in complex systems.

scholarly journals Rational Design of Helical Nanotubes from Self-assembly of Coiled-coil Lock Washers

2013 ◽  
Vol 19 (S2) ◽  
pp. 342-343
Author(s):  
C. Xu ◽  
E.R. Wright ◽  
A. Mehta ◽  
L.C. Ser-pell ◽  
X. Zuo ◽  
...  
Keyword(s):  
Self Assembly ◽  
Rational Design ◽  
Coiled Coil

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

A single-step multi-level supramolecular system for cancer sonotheranostics

2019 ◽  
Vol 4 (1) ◽  
pp. 190-195 ◽  
Author(s):  
Huirong Lin ◽  
Shuang Li ◽  
Junqing Wang ◽  
Chengchao Chu ◽  
Yang Zhang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Single Step ◽  
Supramolecular System ◽  
Therapeutic Effects ◽  
Invasive Approach ◽  
Non Invasive ◽  
Ionic Crosslinking ◽  
Critical Issues ◽  
Multi Level

A multi-level supramolecular system produced by single-step Fe3+-mediated ionic crosslinking self-assembly can overcome the critical issues of current sonodynamic therapy (SDT) and address the need to monitor therapeutic effects in vivo with a non-invasive approach.

Tunable multi-color luminescence from a self-assembled cyanostilbene and cucurbit[7]uril in aqueous media

2020 ◽  
Vol 56 (4) ◽  
pp. 655-658 ◽  
Author(s):  
Shubhra Kanti Bhaumik ◽  
Supratim Banerjee
Keyword(s):  
Self Assembly ◽  
Aqueous Media ◽  
The Self ◽  
Supramolecular System ◽  
Self Assembled ◽  
Guest Chemistry

A tunable multicolor luminescent supramolecular system was designed in aqueous media employing the self-assembly of a cationic amphiphilic cyanostilbene and the host–guest chemistry of cucurbit[7]uril.

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