Doped Polymers by Oxidative Polymerization. 4.†Oxidative Coupling of Methylated Oligothiophenes by FeCl3·6H2O as a Model Reaction for the Oxidative Polymerization of Thiophene Derivatives

1996 ◽  
Vol 29 (10) ◽  
pp. 3370-3375 ◽  
Author(s):  
Gunnar Engelmann ◽  
Werner Jugelt ◽  
Gerhard Kossmehl ◽  
Hans-Peter Welzel ◽  
Peter Tschuncky ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Oxidative Polymerization ◽  
Model Reaction ◽  
Doped Polymers ◽  
Thiophene Derivatives

Insights into the Extraction of Photogenerated Holes from CdSe/CdS Nanorods for Oxidative Organic Catalysis

2021 ◽  
Author(s):  
Yuchen Sha ◽  
Xiao-Min Lin ◽  
Jens Niklas ◽  
Oleg Poluektov ◽  
Benjamin T Diroll ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Model Reaction ◽  
Core Shell ◽  
Organic Media ◽  
Cds Nanorods ◽  
Organic Catalysis

Using aerobic oxidative coupling of thiolphenol in organic media as a model reaction, we show that photogenerated holes in CdSe/CdS core-shell nanorods can be efficiently exctracted. As a result, CdSe/CdS...

ChemInform Abstract: The Formation of Dibenzodioxocin Structures by Oxidative Coupling. A Model Reaction for Lignin Biosynthesis.

ChemInform ◽  
2010 ◽  
Vol 26 (40) ◽  
pp. no-no
Author(s):  
P. KARHUNEN ◽  
P. RUMMAKKO ◽  
J. SIPILAE ◽  
G. BRUNOV ◽  
I. KILPELAEINEN
Keyword(s):  
Oxidative Coupling ◽  
Lignin Biosynthesis ◽  
Model Reaction

The formation of dibenzodioxocin structures by oxidative coupling. A model reaction for lignin biosynthesis

1995 ◽  
Vol 36 (25) ◽  
pp. 4501-4504 ◽  
Author(s):  
Pirkko Karhunen ◽  
Petteri Rummakko ◽  
Jussi Sipilä ◽  
Gösta Brunow ◽  
Ilkka Kilpeläinen
Keyword(s):  
Oxidative Coupling ◽  
Lignin Biosynthesis ◽  
Model Reaction

scholarly journals Catalytic oxidative polymerization of thiophene derivatives

2012 ◽  
Vol 45 (3) ◽  
pp. 281-286 ◽  
Author(s):  
Kousuke Tsuchiya ◽  
Kenji Ogino
Keyword(s):  
Oxidative Polymerization ◽  
Thiophene Derivatives

A Simple and Efficient Synthesis of fused Benzo[b]thiophene Derivatives

Synthesis ◽  
2021 ◽  
Author(s):  
Alexander S. Fisyuk ◽  
Sergey A. Chernenko ◽  
Anastasia S. Kostyuchenko ◽  
Anna Samsonenko ◽  
Anton L. Shatsauskas ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Efficient Method ◽  
Oxidative Coupling ◽  
Pyridine Ring ◽  
Efficient Synthesis ◽  
New Approach ◽  
Fused Heterocycles ◽  
Palladium Catalyzed ◽  
Thiophene Derivatives

A new approach to the synthesis of fused benzothiophene derivatives was developed based on iodine-promoted photo-cyclization of 4,5-diarylsubstituted thiophenes obtained in three steps from commercially available compounds. Comparative analysis showed that photochemical cyclization is a more efficient method for the preparation of fused benzo[b]thiophene derivatives, compared to oxidative coupling 4,5-diarylsubstituted thiophenes in the presence of iron (III) chloride and palladium catalyzed intramolecular arylation. This approach provides an efficient synthesis of functionally substituted naphtho[2,1-b: 3,4-b ']dithiophenes, phenanthro[9,10-b] thiophenes, benzo[1,2-b: 3,4-b': 6 , 5-b '']trithiophenes, as well as new fused heterocycles containing a pyridine ring and / or a carbazole moiety

scholarly journals Synthesis, Characterization and Properties of MgB2 Doped Polyaniline

2017 ◽  
Vol 4 (1) ◽  
pp. 1-9
Author(s):  
Dr Shumaila ◽  
M. Zulfequar ◽  
M. Husain
Keyword(s):  
Conduction Mechanism ◽  
Oxidative Polymerization ◽  
Salt Form ◽  
Absorption Mechanism ◽  
Doped Polymers ◽  
Ft Ir ◽  
Doped Polyaniline ◽  
Uv Visible ◽  
Polymerization Method ◽  
Thermal Stability Of

Present paper reports novel synthesis of MgB2 doped Polyaniline (PAni). PAni is synthesized through oxidative polymerization method using Ammonium Peroxodisulphate and doped by different compositions of MgB2. The DC conductivity of undoped and doped polymers is measured in the temperature range of 300 – 400 K and is found to increase with temperature. An increase in conductivity by five orders of magnitude has been observed after doping. Conduction mechanism was also studied in all of the samples. FT-IR (Fourier Transform Infrared spectroscopy) and ultraviolet (UV)-Visible studies confirm the occurrence of PAni in conducting emeraldine salt form in the composites. The optical studies signify that absorption mechanism is due to direct allowed transition and the band gap decrease after doping. Thermal stability of all the composites has been explained on the basis of variation in Tc–Tg and ∆Hc by using DSC (Differential Scanning Calorimetery) measurements.

Relation Between Local Structure, Electric Dipole and Charge Carrier Dynamics in DHICA Melanin, a Model for Biocompatible Semiconductors

2019 ◽  
Author(s):  
Micaela Matta ◽  
Alessandro Pezzella ◽  
Alessandro Troisi
Keyword(s):  
Electronic Structure ◽  
Degrees Of Freedom ◽  
Structural Model ◽  
Computational Study ◽  
Oxidative Polymerization ◽  
Radical Scavenging ◽  
Charge Carriers ◽  
Electronic Charge ◽  
Polymer Semiconductors ◽  
Synthetic Pigments

<div><div><div><p>Eumelanins are a family of natural and synthetic pigments obtained by oxidative polymerization of their natural precursors: 5,6 dihydroxyindole and its 2-carboxy derivative (DHICA). The simultaneous presence of ionic and electronic charge carriers makes these pigments promising materials for applications in bioelectronics. In this computational study we build a structural model of DHICA melanin considering the interplay between its many degrees of freedom, then we examine the electronic structure of representative oligomers. We find that a non-vanishing dipole along the polymer chain sets this system apart from conventional polymer semiconductors, determining its electronic structure, reactivity toward oxidation and localization of the charge carriers. Our work sheds light on previously unnoticed features of DHICA melanin that not only fit well with its radical scavenging and photoprotective properties, but open new perspectives towards understanding and tuning charge transport in this class of materials.<br></p></div></div></div>

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