Supramolecular Assemblies Based on Organometallic Quinonoid Linkers: A New Class of Coordination Networks

2008 ◽  
Vol 47 (8) ◽  
pp. 1372-1380 ◽  
Author(s):  
Jamal Moussa ◽  
Hani Amouri
Keyword(s):  
Supramolecular Assemblies ◽  
Coordination Networks ◽  
New Class

Supramolecular assemblies of a new class of nonplanar cationic metalloporphyrins and anionic metallophthalocyanines

2009 ◽  
Vol 362 (2) ◽  
pp. 307-317 ◽  
Author(s):  
Marcela G. Ribeiro ◽  
Rodrigo M. Liegel ◽  
Gianluca C. Azzellini
Keyword(s):  
Supramolecular Assemblies ◽  
New Class

Helical Porous Protein Mimics Self-Assembled from Amphiphilic Dendritic Dipeptides

2005 ◽  
Vol 58 (6) ◽  
pp. 472 ◽  
Author(s):  
Virgil Percec ◽  
Andrés Dulcey ◽  
Mihai Peterca ◽  
Monica Ilies ◽  
Yoshiko Miura ◽  
...  
Keyword(s):  
Self Assembly ◽  
Transmembrane Proteins ◽  
Supramolecular Assemblies ◽  
The Self ◽  
Supramolecular Polymers ◽  
Protein Mimics ◽  
New Class ◽  
Solid States ◽  
Self Assembled

This manuscript reports the synthesis and the self-assembly of (4-3,4,5-3,5)nG2-CH2-Boc-l-Tyr-l-Ala-OMe dendritic dipeptides (n = 12, 16). These dendritic dipeptides self-assemble both in solution and in solid states into helical porous supramolecular columns that mimic porous transmembrane proteins. These supramolecular assemblies provide also a new class of tubular supramolecular polymers.

Cyclodextrin-based PNN supramolecular assemblies: a new class of pincer-type ligands for aqueous organometallic catalysis

2015 ◽  
Vol 44 (30) ◽  
pp. 13504-13512 ◽  
Author(s):  
S. Menuel ◽  
E. Bertaut ◽  
E. Monflier ◽  
F. Hapiot
Keyword(s):  
Supramolecular Assemblies ◽  
Pt Catalysts ◽  
New Class ◽  
Organometallic Catalysis ◽  
Self Assembled

Pt-catalysts stabilized in water by self-assembled PNN supramolecular cyclodextrin-based ligands proved to be effective in a Paal–Knorr pyrrole reaction.

Coordination networks and supramolecular assemblies based on barium cation complexes with cucurbit[6]uril

Polyhedron ◽  
2018 ◽  
Vol 144 ◽  
pp. 158-165 ◽  
Author(s):  
Ekaterina A. Kovalenko ◽  
Dmitry Yu. Naumov ◽  
Vladimir P. Fedin
Keyword(s):  
Supramolecular Assemblies ◽  
Coordination Networks ◽  
Barium Cation ◽  
Cation Complexes

scholarly journals Sub-100 nanometer silver doped gold–cysteine supramolecular assemblies with enhanced nonlinear optical properties

2019 ◽  
Vol 21 (23) ◽  
pp. 12091-12099 ◽  
Author(s):  
Hussein Fakhouri ◽  
Martina Perić ◽  
Franck Bertorelle ◽  
Philippe Dugourd ◽  
Xavier Dagany ◽  
...  
Keyword(s):  
Optical Properties ◽  
Optical Property ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Supramolecular Assemblies ◽  
New Class ◽  
Unique Structure ◽  
Property Relationship ◽  
Supramolecular Architectures

The ability of gold(i) thiolates to self-assemble into supramolecular architectures opens the route for a new class of nanomaterials with a unique structure–optical property relationship.

In Situ microscopy of the anodic etching of silicon

1995 ◽  
Vol 53 ◽  
pp. 232-233
Author(s):  
Frances M. Ross ◽  
Peter C. Searson
Keyword(s):  
Composite Structures ◽  
High Surface ◽  
High Surface Area ◽  
Chemical Properties ◽  
Selective Etching ◽  
Silicon On Insulator ◽  
Second Phase ◽  
Porous Layers ◽  
New Class ◽  
Porous Semiconductors

Porous semiconductors represent a relatively new class of materials formed by the selective etching of a single or polycrystalline substrate. Although porous silicon has received considerable attention due to its novel optical properties1, porous layers can be formed in other semiconductors such as GaAs and GaP. These materials are characterised by very high surface area and by electrical, optical and chemical properties that may differ considerably from bulk. The properties depend on the pore morphology, which can be controlled by adjusting the processing conditions and the dopant concentration. A number of novel structures can be fabricated using selective etching. For example, self-supporting membranes can be made by growing pores through a wafer, films with modulated pore structure can be fabricated by varying the applied potential during growth, composite structures can be prepared by depositing a second phase into the pores and silicon-on-insulator structures can be formed by oxidising a buried porous layer. In all these applications the ability to grow nanostructures controllably is critical.

The microtubule associated protein (MAP) tau forms a new class of triple-stranded left-hand helical fibrous protein polymer

1992 ◽  
Vol 50 (1) ◽  
pp. 540-541
Author(s):  
G. C. Ruben ◽  
K. Iqbal ◽  
I. Grundke-Iqbal ◽  
H. Wisniewski ◽  
T. L. Ciardelli ◽  
...  
Keyword(s):  
Axial Ratio ◽  
Normal Structure ◽  
Paired Helical Filaments ◽  
Left Hand ◽  
New Class ◽  
Protein Polymer ◽  
Fibrous Protein ◽  
Protein Map ◽  
Neurotransmitter Transport ◽  
Alzheimer Neurofibrillary Tangles

In neurons, the microtubule associated protein, tau, is found in the axons. Tau stabilizes the microtubules required for neurotransmitter transport to the axonal terminal. Since tau has been found in both Alzheimer neurofibrillary tangles (NFT) and in paired helical filaments (PHF), the study of tau's normal structure had to preceed TEM studies of NFT and PHF. The structure of tau was first studied by ultracentrifugation. This work suggested that it was a rod shaped molecule with an axial ratio of 20:1. More recently, paraciystals of phosphorylated and nonphosphoiylated tau have been reported. Phosphorylated tau was 90-95 nm in length and 3-6 nm in diameter where as nonphosphorylated tau was 69-75 nm in length. A shorter length of 30 nm was reported for undamaged tau indicating that it is an extremely flexible molecule. Tau was also studied in relation to microtubules, and its length was found to be 56.1±14.1 nm.

Study of segregation in La1.8Sr0.2CuO4 superconductor by STEM-EDS microanalysis

1987 ◽  
Vol 45 ◽  
pp. 54-55
Author(s):  
T. F. Kelly ◽  
P. J. Lee ◽  
E. E. Hellstrom ◽  
D. C. Larbalestier
Keyword(s):  
Rare Earth ◽  
High Field ◽  
Transport Current ◽  
Total Thickness ◽  
New Class ◽  
Ceramic Superconductors ◽  
Current Densities ◽  
Group Ii ◽  
Eds Microanalysis

Recently there has been much excitement over a new class of high Tc (>30 K) ceramic superconductors of the form A1-xBxCuO4-x, where A is a rare earth and B is from Group II. Unfortunately these materials have only been able to support small transport current densities 1-10 A/cm2. It is very desirable to increase these values by 2 to 3 orders of magnitude for useful high field applications. The reason for these small transport currents is as yet unknown. Evidence has, however, been presented for superconducting clusters on a 50-100 nm scale and on a 1-3 μm scale. We therefore planned a detailed TEM and STEM microanalysis study in order to see whether any evidence for the clusters could be seen.A La1.8Sr0.2Cu04 pellet was cut into 1 mm thick slices from which 3 mm discs were cut. The discs were subsequently mechanically ground to 100 μm total thickness and dimpled to 20 μm thickness at the center.

Electronic structure studies of conducting polymers by electron energy-loss spectroscopy

1996 ◽  
Vol 54 ◽  
pp. 160-161
Author(s):  
J. Fink
Keyword(s):  
Electronic Structure ◽  
Conducting Polymers ◽  
Conjugated Polymers ◽  
Electron Acceptors ◽  
Electron Donors ◽  
Light Emitting ◽  
One Dimensional ◽  
New Class ◽  
Electrical Conductivities ◽  
Electron Energy Loss

Conducting polymers comprises a new class of materials achieving electrical conductivities which rival those of the best metals. The parent compounds (conjugated polymers) are quasi-one-dimensional semiconductors. These polymers can be doped by electron acceptors or electron donors. The prototype of these materials is polyacetylene (PA). There are various other conjugated polymers such as polyparaphenylene, polyphenylenevinylene, polypoyrrole or polythiophene. The doped systems, i.e. the conducting polymers, have intersting potential technological applications such as replacement of conventional metals in electronic shielding and antistatic equipment, rechargable batteries, and flexible light emitting diodes.Although these systems have been investigated almost 20 years, the electronic structure of the doped metallic systems is not clear and even the reason for the gap in undoped semiconducting systems is under discussion.

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