scholarly journals Synthesis of mesogenic phthalocyanine-C60 donor–acceptor dyads designed for molecular heterojunction photovoltaic devices

2009 ◽  
Vol 5 ◽  
Author(s):  
Yves Henri Geerts ◽  
Olivier Debever ◽  
Claire Amato ◽  
Sergey Sergeyev
Keyword(s):  
Cyclic Voltammetry ◽  
Liquid Crystalline ◽  
Fullerene Derivative ◽  
Cooh Group ◽  
Photovoltaic Devices ◽  
Vis Spectroscopy ◽  
Donor Acceptor ◽  
Key Steps ◽  
Low Symmetry

A series of phthalocyanine-C60 dyads 2a–d was synthesized. Key steps in their synthesis are preparation of the low symmetry phthalocyanine intermediate by the statistical condensation of two phthalonitriles, and the final esterification of the fullerene derivative bearing a free COOH group. Structural characterization of the molecules in solution was performed by NMR spectroscopy, UV–vis spectroscopy and cyclic voltammetry. Preliminary studies suggest formation of liquid crystalline (LC) mesophases for some of the prepared dyads. To the best of our knowledge, this is the first example of LC phthalocyanine-C60 dyads.

Preparation and Characterization of Electrodes Modified with Metalloporphyrins. Application to Reduction of Nitrite

2003 ◽  
Vol 68 (9) ◽  
pp. 1723-1735 ◽  
Author(s):  
Francisco Armijo ◽  
Ejnar Trollund ◽  
Matías Reina ◽  
M. Carmen Arévalo ◽  
M. Jesús Aguirre
Keyword(s):  
Atomic Force Microscopy ◽  
Cyclic Voltammetry ◽  
Modified Electrodes ◽  
Amino Groups ◽  
Catalytic Behavior ◽  
Force Microscopy ◽  
Atomic Force ◽  
Vis Spectroscopy ◽  
Hcl Solution

Six type-modified electrodes by electropolymerization of tetrakis(x-aminophenyl)porphyrins, where x = 2, 3 or 4, and their Cu(II) and Ni(II) complexes in HCl solution were prepared and characterized by cyclic voltammetry, atomic force microscopy and UV-VIS spectroscopy. The morphology of the polymers depends on the position of the amino groups. The modified electrodes show interesting electrocatalytic activity toward reduction of nitrites. The catalytic behavior strongly depends on the nature of the metal and the position of the amino groups.

scholarly journals Improving Polymer Based Photovoltaic Devices by Reducing the Voltage Loss at the Donor-Acceptor Interface

2006 ◽  
Vol 974 ◽  
Author(s):  
Date J. D. Moet ◽  
Lenneke H. Slooff ◽  
Jan M. Kroon ◽  
Svetlana S. Chevtchenko ◽  
Joachim Loos ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Polymer Solar Cells ◽  
Power Conversion ◽  
Fullerene Derivative ◽  
Photovoltaic Devices ◽  
Alternating Copolymer ◽  
Voltage Loss ◽  
Donor Acceptor

ABSTRACTThis paper discusses the characterization and optimization of organic solar cells based on a bulk heterojunction consisting of an alternating copolymer, containing a fluorene and a benzathiadiazole unit with two neighboring thiophene rings, and a fullerene derivative (PCBM). The resulting power conversion efficiency amounts 3.9±0.2 % (AM1.5, 100 mW/cm2) and these polymer solar cells are therefore considered auspicious for further research.

scholarly journals Synthesis and Characterization of Highly Efficient Nickel Nanocatalysts and Their Use in Degradation of Organic Dyes

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Nazar Hussain Kalwar ◽  
Sirajuddin ◽  
Razium Ali Soomro ◽  
Syed Tufail Hussain Sherazi ◽  
Keith Richard Hallam ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Organic Dyes ◽  
X Ray Diffraction ◽  
Surface Binding ◽  
Highly Active ◽  
Vis Spectroscopy ◽  
Eosin B ◽  
Viable Approach ◽  
Triton X

The present study describes the synthesis of highly active and ordered structures of nickel nanocatalysts by a facile, green, and economically viable approach. The study reveals efficient catalytic activity for the degradation of a number of toxic organic dyes, such as eosin-B (EB), rose bengal (RB), eriochrome black-T (ECBT), and methylene blue (MB). The stable ordered nickel nanostructure (Ni NSs) arrays were prepared via a modified hydrazine reduction route with unique and controlled morphologies in a lyotropic liquid crystalline medium using a nonionic surfactant (Triton X-100). Characterization and optimization studies for the fabricated Ni NSs involving their surface binding interactions, size, and morphologies were carried out using UV-Vis spectroscopy, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM).

scholarly journals Thiophene-based donor–acceptor co-oligomers by copper-catalyzed 1,3-dipolar cycloaddition

2012 ◽  
Vol 8 ◽  
pp. 683-692 ◽  
Author(s):  
Stefanie Potratz ◽  
Amaresh Mishra ◽  
Peter Bäuerle
Keyword(s):  
Cyclic Voltammetry ◽  
Conjugated Polymers ◽  
Sodium Azide ◽  
Copper Catalyst ◽  
Optoelectronic Properties ◽  
Dipolar Cycloaddition ◽  
One Pot ◽  
Vis Spectroscopy ◽  
Donor Type ◽  
Donor Acceptor

Herein we present a three-component one-pot procedure to synthesize co-oligomers of a donor–acceptor–donor type, in which thiophene moieties work as donor and 1,2,3-triazoles as acceptor units. In this respect, terminally ethynylated (oligo)thiophenes were coupled to halogenated (oligo)thiophenes in the presence of sodium azide and a copper catalyst. Optoelectronic properties of various thiophene-1,2,3-triazole co-oligomers were investigated by UV–vis spectroscopy and cyclic voltammetry. Several co-oligomers were electropolymerized to the corresponding conjugated polymers.

Synthesis and Characterization of Some New Esters Containing Heterocyclic and Derived From Azo Dyes

2019 ◽  
Vol 9 (02) ◽  
Author(s):  
Zena G. Alrecabi ◽  
Zainab Amer ◽  
Naeemah Al-Lami
Keyword(s):  
Schiff Base ◽  
13C Nmr ◽  
Azo Dyes ◽  
Spectral Methods ◽  
Anthranilic Acid ◽  
Heterocyclic Compounds ◽  
Synthesis And Characterization ◽  
Cooh Group ◽  
Molecular Weights

This study including prepared new colored esters containing heterocyclic with high molecular weights. In the first part of work we synthesized azo dyes [1,2] from the reaction p-toluidine with β-naphthol and o-nitro phenol, thin we synthesized Schiff bases [3,4] by the reaction anthranilic acid with benzaldehyde and dimethyl benzaldehyde. The reaction azo dyes (contain OH group) with Schiff base (contain COOH group) these led to produce the new colored esters [A1-A4]. The second part of work was modification the (C=N-) group in esters to heterocyclic compounds by reacting with phenyl iso cyanide to produce new β-lactam [B1-B4] and with anthranilic acid to get new hydroquinazoline [C1-C4]. All these compounds were characterized by physical properties and spectral methods FTIR, 1H-NMR and 13C-NMR.

Advanced characterization of Perovskite systems: Understanding and improving the performance and stability of photovoltaic devices

2017 ◽  
Author(s):  
Pia Dally ◽  
Noella Lemaitre ◽  
Stéphanie Pouget ◽  
Stéphane Cros ◽  
Serge Gambarelli ◽  
...  
Keyword(s):  
Advanced Characterization ◽  
Photovoltaic Devices

Production and Characterization of Fine-dispersed Mixtures of Liquid Crystalline with Conventional Polymers

1991 ◽  
Vol 6 (3) ◽  
pp. 239-246 ◽  
Author(s):  
S. Meretz ◽  
M. Kwiatkowski ◽  
G. Hinrichsen
Keyword(s):  
Liquid Crystalline

Polymer Chemistry

2004 ◽  
Keyword(s):  
Conducting Polymers ◽  
Liquid Crystalline ◽  
Polymer Chemistry ◽  
Chain Growth ◽  
Crystalline Polymers ◽  
Wide Range ◽  
Cyclic Oligomers ◽  
Step Growth

Polymer Chemistry: A Practical Approach in Chemistry has been designed for both chemists working in and new to the area of polymer synthesis. It contains detailed instructions for preparation of a wide-range of polymers by a wide variety of different techniques, and describes how this synthetic methodology can be applied to the development of new materials. It includes details of well-established techniques, e.g. chain-growth or step-growth processes together with more up-to-date examples using methods such as atom-transfer radical polymerization. Less well-known procedures are also included, e.g. electrochemical synthesis of conducting polymers and the preparation of liquid crystalline elastomers with highly ordered structures. Other topics covered include general polymerization methodology, controlled/"living" polymerization methods, the formation of cyclic oligomers during step-growth polymerization, the synthesis of conducting polymers based on heterocyclic compounds, dendrimers, the preparation of imprinted polymers and liquid crystalline polymers. The main bulk of the text is preceded by an introductory chapter detailing some of the techniques available to the scientist for the characterization of polymers, both in terms of their chemical composition and in terms of their properties as materials. The book is intended not only for the specialist in polymer chemistry, but also for the organic chemist with little experience who requires a practical introduction to the field.

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