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Search for "redox properties" in Full Text gives 68 result(s) in Beilstein Journal of Organic Chemistry.

TTFs nonsymmetrically fused with alkylthiophenic moieties

  • Rafaela A. L. Silva,
  • Bruno J. C. Vieira,
  • Marta M. Andrade,
  • Isabel C. Santos,
  • Sandra Rabaça,
  • Dulce Belo and
  • Manuel Almeida

Beilstein J. Org. Chem. 2015, 11, 628–637, doi:10.3762/bjoc.11.71

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  • charge transfer salt of 2, (α-mtdt)[Au(mnt)2] (3), (mnt = maleonitriledithiolate) could be obtained by electrocrystallization using standard conditions. Redox properties The redox properties of the donors 1 and 2 in solution were studied by cyclic voltammetry and the results are collected in Table 1
  • immediately before its use. The system was sealed under nitrogen and after ca. 3 days, using a current density of 1 μA·cm−2, dark brown plate-shaped crystals were collected in the anode and washed with dichloromethane. Redox properties Cyclic voltammetry data were obtained using a BAS C3 Cell Stand. The
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Published 05 May 2015

Eosin Y-catalyzed visible-light-mediated aerobic oxidative cyclization of N,N-dimethylanilines with maleimides

  • Zhongwei Liang,
  • Song Xu,
  • Wenyan Tian and
  • Ronghua Zhang

Beilstein J. Org. Chem. 2015, 11, 425–430, doi:10.3762/bjoc.11.48

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  • and not sustainable. Similar to the redox properties of these organometallic complexes, some metal-free organic dyes such as Eosin Y, Rose Bengal, Fluorescein, and Methylene Blue, have shown superiority of their applications as photocatalysts, which are easy to handle, environmentally friendly
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Published 01 Apr 2015

Bis(vinylenedithio)tetrathiafulvalene analogues of BEDT-TTF

  • Erdal Ertas,
  • İlknur Demirtas and
  • Turan Ozturk

Beilstein J. Org. Chem. 2015, 11, 403–415, doi:10.3762/bjoc.11.46

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  • was obtained in a similar manner. The redox properties of the donor molecules 29a–d, 32a–d, 33a–c and ET 3 were studied by cyclic voltammetry in solution in acetonitrile, containing NaClO4 and dichloromethane, containing tetrabutylammonium tetrafluoroborate (TBABF4) (Table 2 and Table 3). Measurements
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Published 27 Mar 2015

Functionalized branched EDOT-terthiophene copolymer films by electropolymerization and post-polymerization “click”-reactions

  • Miriam Goll,
  • Adrian Ruff,
  • Erna Muks,
  • Felix Goerigk,
  • Beatrice Omiecienski,
  • Ines Ruff,
  • Rafael C. González-Cano,
  • Juan T. Lopez Navarrete,
  • M. Carmen Ruiz Delgado and
  • Sabine Ludwigs

Beilstein J. Org. Chem. 2015, 11, 335–347, doi:10.3762/bjoc.11.39

Graphical Abstract
  • ″-terthiophene (3T) is presented as a versatile route to functional polymer films. Comparisons to blend systems of the respective homopolymers PEDOT and P3T by in situ spectroelectrochemistry and Raman spectroscopy prove the successful copolymer formation and the access to tailored redox properties and energy
  • spectroscopic (in situ and ex situ) techniques. We further show that the redox properties of the polymers remain identical when EDOT–N3 is used as a co-monomer instead of EDOT and that “click”-chemistry is a versatile tool to largely modify material properties, e.g., by the introduction of covalently bound
  • voltammogram (CV) of the PEDOT/P3T-blend has two current maxima located at −0.3 and +0.7 V. Both values correspond to the oxidation potentials of the respective homopolymers indicating the combination of the redox properties of PEDOT and P3T. The P(EDOT-co-3T)-1:1 film on the other hand shows one broad
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Published 11 Mar 2015

Synthesis and properties of novel star-shaped oligofluorene conjugated systems with BODIPY cores

  • Clara Orofino-Pena,
  • Diego Cortizo-Lacalle,
  • Joseph Cameron,
  • Muhammad T. Sajjad,
  • Pavlos P. Manousiadis,
  • Neil J. Findlay,
  • Alexander L. Kanibolotsky,
  • Dimali Amarasinghe,
  • Peter J. Skabara,
  • Tell Tuttle,
  • Graham A. Turnbull and
  • Ifor D. W. Samuel

Beilstein J. Org. Chem. 2014, 10, 2704–2714, doi:10.3762/bjoc.10.285

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  • were studied in dichloromethane solutions with the concentration of the analyte ca. 10−4 M, and the results are summarised in Table 2. The redox properties of the materials were investigated by cyclic voltammetry and the oxidation and reduction waves of Y-Bn (n = 1–4) and T-Bn (n = 1–4) series are
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Published 19 Nov 2014

The effect of permodified cyclodextrins encapsulation on the photophysical properties of a polyfluorene with randomly distributed electron-donor and rotaxane electron-acceptor units

  • Aurica Farcas,
  • Ana-Maria Resmerita,
  • Pierre-Henri Aubert,
  • Flavian Farcas,
  • Iuliana Stoica and
  • Anton Airinei

Beilstein J. Org. Chem. 2014, 10, 2145–2156, doi:10.3762/bjoc.10.222

Graphical Abstract
  • only be attributed to the excitonic contribution [39]. To further understand the electronic properties of the copolymers, the redox properties, i.e., the oxidation Eox and the reduction potentials Ered of the copolymers were investigated by cyclic voltammetry (CV) (Figure 9 and Table 3). CV experiments
  • polyrotaxanes. The roughness exponent α calculated as the slope of log(Sq) versus log(Lsc) for the reference 4, 4a and 4b polyrotaxanes. Molecular weight (Mn in g∙mol−1), polydispersity index (Mw/Mn), coverage ratio, and thermal properties of the copolymers. Optical properties of copolymers. The redox
  • properties of 4, 4a and 4b copolymers. Supporting Information FTIR spectra of the TMS-β-CD and copolymers, 1H NMR spectra of the TMS-β-CD, non-rotaxane 4 and 4b polyrotaxane copolymers, the fluorescence lifetimes of the non-rotaxane 4 and 4b polyrotaxane copolymers, the diagram with HOMO/LUMO levels of the
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Published 09 Sep 2014

Homogeneous and heterogeneous photoredox-catalyzed hydroxymethylation of ketones and keto esters: catalyst screening, chemoselectivity and dilution effects

  • Axel G. Griesbeck and
  • Melissa Reckenthäler

Beilstein J. Org. Chem. 2014, 10, 1143–1150, doi:10.3762/bjoc.10.114

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  • semiconductor particles that absorb in the UV-A and near visible reagion. The widely used TiO2 has found numerous applications in photochemical water detoxification or surface purification because of its favourable excited-state redox properties [11]. In synthetic applications of semiconductor photocatalysis
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Published 19 May 2014

New core-pyrene π structure organophotocatalysts usable as highly efficient photoinitiators

  • Sofia Telitel,
  • Frédéric Dumur,
  • Thomas Faury,
  • Bernadette Graff,
  • Mohamad-Ali Tehfe,
  • Didier Gigmes,
  • Jean-Pierre Fouassier and
  • Jacques Lalevée

Beilstein J. Org. Chem. 2013, 9, 877–890, doi:10.3762/bjoc.9.101

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  • Light absorption, redox properties and MO calculations The UV absorption spectra of the different pyrene derivatives are depicted in Figure 1. The solvents were selected for good solubility of the Co_Pys. Absorption maxima are located at ~350 nm for Py_2, Py_3, Py_4, Py_5, Py_12, Py_8, Py_9, Py_10
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Published 07 May 2013

Synthesis, photophysical and electrochemical characterization of terpyridine-functionalized dendritic oligothiophenes and their Ru(II) complexes

  • Amaresh Mishra,
  • Elena Mena-Osteritz and
  • Peter Bäuerle

Beilstein J. Org. Chem. 2013, 9, 866–876, doi:10.3762/bjoc.9.100

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  • HOMO-1 in the case of 1) and the LUMO for both complexes corroborate the 1MLCT character. Redox properties. Oxidation and reduction properties of all compounds were investigated by using cyclic voltammetry (CV). Electrochemical data of the ligands and the corresponding Ru(II) complexes are presented in
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Published 06 May 2013

Hybrid super electron donors – preparation and reactivity

  • Jean Garnier,
  • Douglas W. Thomson,
  • Shengze Zhou,
  • Phillip I. Jolly,
  • Leonard E. A. Berlouis and
  • John A. Murphy

Beilstein J. Org. Chem. 2012, 8, 994–1002, doi:10.3762/bjoc.8.112

Graphical Abstract
  • trimethylene tethers. As compounds 10 and 11 are derived from imidazolium precursors, we were keen to explore their reactivity. The redox properties of the donors were first measured by cyclic voltammetry. Either the electron donors or their oxidized salts could, in principle, be used as a starting point for
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Published 03 Jul 2012

On the bromination of the dihydroazulene/vinylheptafulvene photo-/thermoswitch

  • Virginia Mazzanti,
  • Martina Cacciarini,
  • Søren L. Broman,
  • Christian R. Parker,
  • Magnus Schau-Magnussen,
  • Andrew D. Bond and
  • Mogens B. Nielsen

Beilstein J. Org. Chem. 2012, 8, 958–966, doi:10.3762/bjoc.8.108

Graphical Abstract
  • optical and redox properties [13]. The two bromo positions of 14 showed very different reactivity. Thus, subjecting 14 to a Sonogashira coupling with triisopropylsilylacetylene by using the Pd(PPh3)2Cl2/CuI catalyst system only gave the monocoupled product 15 (Scheme 7), confirmed by X-ray crystal
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Published 27 Jun 2012

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

  • Stefanie Potratz,
  • Amaresh Mishra and
  • Peter Bäuerle

Beilstein J. Org. Chem. 2012, 8, 683–692, doi:10.3762/bjoc.8.76

Graphical Abstract
  • . Conclusion In summary, a series of novel thiophene-1,2,3-triazole co-oligomers was synthesized in good to excellent yields by a three-component two-step procedure using copper-catalyzed [3 + 2]-Huisgen cycloaddition reactions. Spectroscopic and redox properties of selected donor–acceptor–donor derivatives
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Published 03 May 2012

Sexithiophenes as efficient luminescence quenchers of quantum dots

  • Christopher R. Mason,
  • Yang Li,
  • Paul O’Brien,
  • Neil J. Findlay and
  • Peter J. Skabara

Beilstein J. Org. Chem. 2011, 7, 1722–1731, doi:10.3762/bjoc.7.202

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  • ). Characterisation of physical properties A film of methyl-capped dimethylaminosexithiophene 1b on ITO glass was obtained by spin coating from a chloroform solution, and the redox properties were compared to those of nonfunctionalised analogue 2b (Figure 2; Table 1). In the positive scan, the cyclic voltammogram for
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Published 22 Dec 2011

Structure and reactivity in neutral organic electron donors derived from 4-dimethylaminopyridine

  • Jean Garnier,
  • Alan R. Kennedy,
  • Leonard E. A. Berlouis,
  • Andrew T. Turner and
  • John A. Murphy

Beilstein J. Org. Chem. 2010, 6, No. 73, doi:10.3762/bjoc.6.73

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  • SK10 2NA, United Kingdom 10.3762/bjoc.6.73 Abstract The effects on the redox properties of modifying the molecular skeleton of neutral bis-2-(4-dimethylamino)pyridinylidene electron donors, derived from 4-dimethylaminopyridine (4-DMAP), have been explored, by varying two parameters: (i) the length of
  • results are in accord with the previous reactions of donor 8, and show that significantly more powerful donors than 8 cannot be attained simply by altering the tether length between the two pyridine units. Similarly, simple modifications to the 4′-substituent do not lead to very large changes in the redox
  • properties of 8. [The oxidation potentials of these new donors and the preceding examples mentioned in this paper are tabulated below in Table 1.] These outcomes are already helping our design of new, versatile and more powerful organic electron donors. Neutral organic electron donors 1 and 4–10. Formation
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Published 05 Jul 2010

Synthetic incorporation of Nile Blue into DNA using 2′-deoxyriboside substitutes: Representative comparison of (R)- and (S)-aminopropanediol as an acyclic linker

  • Daniel Lachmann,
  • Sina Berndl,
  • Otto S. Wolfbeis and
  • Hans-Achim Wagenknecht

Beilstein J. Org. Chem. 2010, 6, No. 13, doi:10.3762/bjoc.6.13

Graphical Abstract
  • explore how important the chirality of the 3-amino-1,2-propanediol linker is with respect to the optical properties of an attached fluorophore. We chose Nile Blue as the fluorescent probe for these experiments since the redox properties of this phenoxazinium label exhibit a potential sufficient for
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Published 09 Feb 2010

Synthesis of rigidified flavin–guanidinium ion conjugates and investigation of their photocatalytic properties

  • Harald Schmaderer,
  • Mouchumi Bhuyan and
  • Burkhard König

Beilstein J. Org. Chem. 2009, 5, No. 26, doi:10.3762/bjoc.5.26

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  • ; Introduction Flavins are redox-active chromophores [1][2][3][4][5][6] and represent one of the most abundant classes of natural enzyme co-factors [7][8][9]. Recently, the photo redox properties of flavins have been used to catalyze chemical reactions [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24
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Published 28 May 2009

Synthesis and redox behavior of new ferrocene- π-extended- dithiafulvalenes: An approach for anticipated organic conductors

  • Abdelwareth A. O. Sarhan,
  • Omar F. Mohammed and
  • Taeko Izumi

Beilstein J. Org. Chem. 2009, 5, No. 6, doi:10.3762/bjoc.5.6

Graphical Abstract
  • prepared as side products during the synthesis of the targeted compounds as bis(1,3-dithiafulvalene)ferrocenes 8, 10 and 11 in variable yields. The redox properties of the compounds have been investigated by cyclic voltammetry at ambient temperature using tetra-n-butylammonium perchlorate (TBAP) as the
  • product was identified as 1,1′-bis(1,3-DTF)Fc 11 in 24% yield in addition to the (1,3-DTF)Fc 12 as a major product (76% isolated yield) (Scheme 4). Electrochemistry The electrochemical redox properties of the newly synthesized Fc-DTFs 9 and 12, the 1,1′-bis(1,3-DTF)Fc’s 8, 10, 11, and the acylferrocenes
  • observed (ΔEp > 230 mV), indicating that the irreversibility of the electron-transfer process was maintained under these conditions, possibly due to the onset of kinetic complications. The electrochemical redox properties of compounds 5a–e were studied by cyclic voltammetry and the data are listed in Table
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Published 19 Feb 2009

Synthesis of coumarin or ferrocene labeled nucleosides via Staudinger ligation

  • Ivana Kosiova,
  • Andrea Janicova and
  • Pavol Kois

Beilstein J. Org. Chem. 2006, 2, No. 23, doi:10.1186/1860-5397-2-23

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  • expensive optical detection would be gradually replaced by simpler and cheaper electrochemical detection based on the redox properties and electrical conductance of biomolecules. [11][12] Electrochemical techniques can be highly sensitive, rapid and available to production in miniaturised formats. Although
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Published 30 Nov 2006
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