scholarly journals End Group-Functionalization and Synthesis of Block-Copolythiophenes by Modified Nickel Initiators

2011 ◽  
Vol 44 (15) ◽  
pp. 6017-6025 ◽  
Author(s):  
Alfons Smeets ◽  
Pieter Willot ◽  
Julien De Winter ◽  
Pascal Gerbaux ◽  
Thierry Verbiest ◽  
...  
Keyword(s):  
End Group Functionalization ◽  
End Group

scholarly journals End group functionalization of poly(ethylene glycol) with phenolphthalein: towards star-shaped polymers based on supramolecular interactions

2014 ◽  
Vol 10 ◽  
pp. 2263-2269 ◽  
Author(s):  
Carolin Fleischmann ◽  
Hendrik Wöhlk ◽  
Helmut Ritter
Keyword(s):  
Ethylene Glycol ◽  
Cycloaddition Reaction ◽  
Supramolecular Interactions ◽  
Poly Ethylene Glycol ◽  
Naked Eye ◽  
Vis Spectroscopy ◽  
End Group Functionalization ◽  
Interesting Approach ◽  
Poly Ethylene ◽  
End Group

The synthesis of a new phenolphthalein azide derivative, which can be easily utilized in polymer analogous reactions, is presented. The subsequent cycloaddition reaction with propargyl-functionalized methoxypoly(ethylene glycol) yielded polymers bearing phenolphthalein as the covalently attached end group. In presence of per-β-cyclodextrin-dipentaerythritol, the formation of stable inclusion complexes was observed, representing an interesting approach towards the formation of star shaped polymers. The decolorization of a basic polymer solution caused by the complexation was of great advantage since this behavior enabled following the complex formation by UV–vis spectroscopy and even the naked eye.

scholarly journals Effects of Trehalose Polycation End-Group Functionalization on Plasmid DNA Uptake and Transfection

2012 ◽  
Vol 13 (8) ◽  
pp. 2229-2239 ◽  
Author(s):  
Kevin Anderson ◽  
Antons Sizovs ◽  
Mallory Cortez ◽  
Chris Waldron ◽  
D. M. Haddleton ◽  
...  
Keyword(s):  
Plasmid Dna ◽  
Dna Uptake ◽  
End Group Functionalization ◽  
End Group

scholarly journals Regioselective chitosan end-group activation: the triskelion approach

RSC Advances ◽  
2017 ◽  
Vol 7 (30) ◽  
pp. 18628-18638 ◽  
Author(s):  
V. D. Pickenhahn ◽  
M. Grange ◽  
G. De Crescenzo ◽  
M. Lavertu ◽  
M. D. Buschmann
Keyword(s):  
Reactive Species ◽  
End Group Functionalization ◽  
End Group

Non-reactive chitosan extremities are regioselectively activated with a trivalent linker, called triskelion, allowing subsequent end-group functionalization with any thiol-reactive species.

scholarly journals 3,4-Ethylenedioxythiophene (EDOT) End-Group Functionalized Poly-ε-caprolactone (PCL): Self-Assembly in Organic Solvents and Its Coincidentally Observed Peculiar Behavior in Thin Film and Protonated Media

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2720
Author(s):  
Anca-Dana Bendrea ◽  
Luminita Cianga ◽  
Gabriela-Liliana Ailiesei ◽  
Elena-Laura Ursu ◽  
Demet Göen Göen Colak ◽  
...  
Keyword(s):  
Self Assembly ◽  
Soft Materials ◽  
Future Research ◽  
Blue Color ◽  
High Concentration ◽  
Structural Details ◽  
End Group Functionalization ◽  
Lamellar Crystals ◽  
Experimental Findings ◽  
End Group

End-group functionalization of homopolymers is a valuable way to produce high-fidelity nanostructured and functional soft materials when the structures obtained have the capacity for self-assembly (SA) encoded in their structural details. Herein, an end-functionalized PCL with a π-conjugated EDOT moiety, (EDOT-PCL), designed exclusively from hydrophobic domains, as a functional “hydrophobic amphiphile”, was synthesized in the bulk ROP of ε-caprolactone. The experimental results obtained by spectroscopic methods, including NMR, UV-vis, and fluorescence, using DLS and by AFM, confirm that in solvents with extremely different polarities (chloroform and acetonitrile), EDOT-PCL presents an interaction- and structure-based bias, which is strong and selective enough to exert control over supramolecular packing, both in dispersions and in the film state. This leads to the diversity of SA structures, including spheroidal, straight, and helical rods, as well as orthorhombic single crystals, with solvent-dependent shapes and sizes, confirming that EDOT-PCL behaves as a “block-molecule”. According to the results from AFM imaging, an unexpected transformation of micelle-type nanostructures into single 2D lamellar crystals, through breakout crystallization, took place by simple acetonitrile evaporation during the formation of the film on the mica support at room temperature. Moreover, EDOT-PCL’s propensity for spontaneous oxidant-free oligomerization in acidic media was proposed as a presumptive answer for the unexpected appearance of blue color during its dissolution in CDCl3 at a high concentration. FT-IR, UV-vis, and fluorescence techniques were used to support this claim. Besides being intriguing and unforeseen, the experimental findings concerning EDOT-PCL have raised new and interesting questions that deserve to be addressed in future research.

scholarly journals Effects of end group functionalization and level alignment on electron transport in molecular devices

2008 ◽  
Vol 128 (2) ◽  
pp. 024708 ◽  
Author(s):  
Gunn Kim ◽  
Shuchun Wang ◽  
Wenchang Lu ◽  
Marco Buongiorno Nardelli ◽  
J. Bernholc
Keyword(s):  
Electron Transport ◽  
Molecular Devices ◽  
End Group Functionalization ◽  
End Group
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