Using “click” chemistry to access a new class of tripodal P3-ligand containing PC bonds

2010 ◽  
Vol 39 (25) ◽  
pp. 5774 ◽  
Author(s):  
Sam L. Choong ◽  
Cameron Jones ◽  
Andreas Stasch
Keyword(s):  
Click Chemistry ◽  
New Class

scholarly journals Synthesis and click chemistry of a new class of biodegradable polylactide towards tunable thermo-responsive biomaterials

2015 ◽  
Vol 6 (8) ◽  
pp. 1275-1285 ◽  
Author(s):  
Quanxuan Zhang ◽  
Hong Ren ◽  
Gregory L. Baker
Keyword(s):  
Click Chemistry ◽  
New Class ◽  
Smart Biomaterials

A new class of clickable polylactide was prepared and resulted in novel smart biomaterials with tunable thermo-responsive propertyviaclick chemistry.

An efficient method to prepare a new class of regioregular graft copolymer via a click chemistry approach

RSC Advances ◽  
2015 ◽  
Vol 5 (90) ◽  
pp. 74159-74161 ◽  
Author(s):  
Shivshankar R. Mane ◽  
Santu Sarkar ◽  
Vijayakameswara Rao N. ◽  
Ashlin Sathyan ◽  
Raja Shunmugam
Keyword(s):  
Click Chemistry ◽  
Graft Copolymer ◽  
Efficient Method ◽  
New Class ◽  
Regioregular Poly

Herein, we report the synthesis of a novel regioregular poly-norbornene anhydride-g-(3-hexyl thiophene) (PNBA-g-PHT) graft copolymer.

Synthesis, characterization, optical and electrochemical properties and antifungal and anticancer activities of ferrocenyl conjugated novel dendrimers

2017 ◽  
Vol 41 (4) ◽  
pp. 1714-1722 ◽  
Author(s):  
Velautham Saravanan ◽  
Ayyavoo Kannan ◽  
Perumal Rajakumar
Keyword(s):  
Antifungal Activity ◽  
Electrochemical Properties ◽  
Anticancer Activity ◽  
Click Chemistry ◽  
Fungal Pathogens ◽  
Anticancer Activities ◽  
New Class ◽  
Mcf 7

A new class of triazoloferrocenyl conjugates was prepared by copper(i) catalyzed click chemistry, which shows good antifungal activity against fungal pathogens, and also shows excellent anticancer activity against MCF-7 cells.

Photophysical and Electrochemical Properties and Anticancer Activities of Porphyrin-Cored Fluorenodendrimers Synthesized by Click Chemistry

Synlett ◽  
2018 ◽  
Vol 29 (15) ◽  
pp. 1995-2000
Author(s):  
Perumal Rajakumar ◽  
Devaraj Anandkumar
Keyword(s):  
Click Chemistry ◽  
Bathochromic Shift ◽  
13C Nmr Spectroscopy ◽  
Oxidation Potential ◽  
Anticancer Activities ◽  
New Class ◽  
Vis Spectroscopy ◽  
Dendrimer Generation ◽  
Convergent Approach ◽  
First And Second Generation

A new class of porphyrin-cored fluorenodendrimers were synthesized by a convergent approach through click chemistry. The zeroth-, first-, and second-generation porphyrin-cored fluorenodendrimers were characterized by means of 1H and 13C NMR spectroscopy, UV-vis spectroscopy, fluorescent spectroscopy, elemental analysis, and MALDI-TOF mass spectrometry. The UV-vis spectrum of the dendrimers showed an increase in the absorption intensity on increasing the dendrimer generation, and a bathochromic shift was observed for higher-generation dendrimers compared with lower-generation dendrimers. The dendrimers showed emission bands at 317, 604–668, and 617–668 nm, the intensity of which increased with increasing dendrimer generation. All the synthesized dendrimers exhibited a reversible oxidation potential in cyclic voltammetry. The therapeutic efficacy of the porphyrin-cored fluorenodendrimers for the inhibition of a growth tumor cell (PA-1) increased with increasing generation number of the dendrimer.

A new class of dual responsive self-healable hydrogels based on a core crosslinked ionic block copolymer micelle prepared via RAFT polymerization and Diels–Alder “click” chemistry

Soft Matter ◽  
2017 ◽  
Vol 13 (47) ◽  
pp. 9024-9035 ◽  
Author(s):  
Sovan Lal Banerjee ◽  
Nikhil K. Singha
Keyword(s):  
Block Copolymer ◽  
Click Chemistry ◽  
Raft Polymerization ◽  
Diels Alder ◽  
Block Copolymer Micelle ◽  
New Class ◽  
Dual Responsive ◽  
Copolymer Micelle

Smart dual responsive self-healable hydrogels based on a core crosslinked amphiphilic ionic block copolymer micelle were prepared via RAFT polymerization and Diels–Alder “click” chemistry.

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.

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