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Search for "absorption spectroscopy" in Full Text gives 88 result(s) in Beilstein Journal of Organic Chemistry.

Tailoring of organic dyes with oxidoreductive compounds to obtain photocyclic radical generator systems exhibiting photocatalytic behavior

  • Christian Ley,
  • Julien Christmann,
  • Ahmad Ibrahim,
  • Luciano H. Di Stefano and
  • Xavier Allonas

Beilstein J. Org. Chem. 2014, 10, 936–947, doi:10.3762/bjoc.10.92

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  • reaction. Thus, according to Beer–Lambert's law, the absorbance of the system decreases during the reaction: this bleaching could be followed by UV–visible absorption spectroscopy. The photolysis of an acetonitrile solution of RB/TA was done within a 1 cm width cell with a monochromatic 532 nm laser diode
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Published 25 Apr 2014

A peptidic hydrogel that may behave as a “Trojan Horse”

  • Nicola Castellucci,
  • Giorgio Sartor,
  • Natalia Calonghi,
  • Carola Parolin,
  • Giuseppe Falini and
  • Claudia Tomasini

Beilstein J. Org. Chem. 2013, 9, 417–424, doi:10.3762/bjoc.9.44

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  • collected within the 2Θ range from 5° to 35° with a step size (Δ2Θ) of 0.02° and a counting time of 1200 s. Atomic absorption spectroscopy analysis: Elemental platinum concentrations in medium solutions were measured with a Perkin-Elmer Mod. AAnalyst 100 Absorption Spectrometer (Perkin-Elmer Co., Norwalk
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Published 22 Feb 2013

Spin state switching in iron coordination compounds

  • Philipp Gütlich,
  • Ana B. Gaspar and
  • Yann Garcia

Beilstein J. Org. Chem. 2013, 9, 342–391, doi:10.3762/bjoc.9.39

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  • survey of such methods employed less frequently is given in the following. X-ray absorption spectroscopy (XAS) can help in obtaining structural information in cases where the material under study is highly dispersed and no single crystal is available. It is usually carried out in two variants: X-ray
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Published 15 Feb 2013

Recent advances towards azobenzene-based light-driven real-time information-transmitting materials

  • Jaume García-Amorós and
  • Dolores Velasco

Beilstein J. Org. Chem. 2012, 8, 1003–1017, doi:10.3762/bjoc.8.113

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  • )azobenzene (10) revealed very different behaviours. While the azoderivative 4 exhibits a very slow thermal isomerisation, which can be nicely followed by conventional time-resolved absorption spectroscopy, the thermal back reaction of azophenol 10 must be determined by the laser flash-photolysis technique
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Published 04 Jul 2012

Diarylethene-modified nucleotides for switching optical properties in DNA

  • Sebastian Barrois and
  • Hans-Achim Wagenknecht

Beilstein J. Org. Chem. 2012, 8, 905–914, doi:10.3762/bjoc.8.103

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  • % yield. Photochromic properties of diarylethene-modified 2’-deoxyuridines 4–6 The photochromic properties of the modified nucleosides 4–6 were characterized by UV–vis absorption spectroscopy at rt. All irradiations for photoswitching of the nucleosides were performed by using a 75 W Xe arc lamp equipped
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Published 20 Jun 2012

Multistep organic synthesis of modular photosystems

  • Naomi Sakai and
  • Stefan Matile

Beilstein J. Org. Chem. 2012, 8, 897–904, doi:10.3762/bjoc.8.102

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  • ferricyanide reduction in solution, and by absorption spectroscopy (Scheme 4). The obtained monolayers of 48 were annealed for 1 h in the oven at 120 °C. These conditions are known to improve the covalent bonding between phosphonic acids and the ITO substrate [26]. The disulfide protecting groups on the
  • the ITO surface by precipitation during polymerization in solution was determined by absorption spectroscopy. Plots of the absorption of the electrode as a function of the concentration of the propagator in solution revealed both cSOSIP, the critical concentration needed for SOSIP, and cSOL, the
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Published 19 Jun 2012

Imidazole as a parent π-conjugated backbone in charge-transfer chromophores

  • Jiří Kulhánek and
  • Filip Bureš

Beilstein J. Org. Chem. 2012, 8, 25–49, doi:10.3762/bjoc.8.4

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  • , respectively [71]. This molecule was investigated in terms of absorption spectroscopy, X-ray analysis, and electrochemistry and showed remarkable responses as a function of pH. Unfortunately, no NLO properties were investigated. Benzimidazole-derived compounds were recently also used as chromophores with
  • mainly investigated by Rasmussen et al. [29][81][86][87][88][96][97][98][99]. However, these systems were not intended as nonlinear optical polymers. Their properties were primarily studied by electrochemistry, absorption spectroscopy, NMR, FTIR spectroscopy, DSC, and TGA. Nevertheless, in 1998, Tripathy
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Published 05 Jan 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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  • Sexithiophenes 1a and 1b, in which a 4-(dimethylamino)phenyl unit is incorporated as an end-capping group, were synthesised and characterised by cyclic voltammetry, absorption spectroscopy and UV–vis spectroelectrochemistry. Additionally, their ability to function as effective luminescence quenchers for quantum
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Published 22 Dec 2011

Donor-acceptor substituted phenylethynyltriphenylenes – excited state intramolecular charge transfer, solvatochromic absorption and fluorescence emission

  • Ritesh Nandy and
  • Sethuraman Sankararaman

Beilstein J. Org. Chem. 2010, 6, 992–1001, doi:10.3762/bjoc.6.112

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  • substituted with electron withdrawing groups on the phenyl ring. HOMO–LUMO energy gaps have been estimated based on electrochemical studies and compared with those obtained from absorption spectroscopy. Results and Discussion Synthesis 2-Ethynyltriphenylene (4) was synthesized by coupling 2-iodotriphenylene
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Published 18 Oct 2010

Synthesis, electronic properties and self-assembly on Au{111} of thiolated (oligo)phenothiazines

  • Adam W. Franz,
  • Svetlana Stoycheva,
  • Michael Himmelhaus and
  • Thomas J. J. Müller

Beilstein J. Org. Chem. 2010, 6, No. 72, doi:10.3762/bjoc.6.72

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  • , contact angle measurements, X-ray photoelectron spectroscopy, and infrared reflection absorption spectroscopy (IRRAS) [39], we applied ellipsometry in combination with molecular modeling at the force field and DFT levels of theory for the characterization of SAMs of in situ liberated (oligo)phenothiazinyl
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Published 02 Jul 2010

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

  • Yves Henri Geerts,
  • Olivier Debever,
  • Claire Amato and
  • Sergey Sergeyev

Beilstein J. Org. Chem. 2009, 5, No. 49, doi:10.3762/bjoc.5.49

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  • , the relatively modest yields are comparable with or superior to those previously reported for the esterification of poorly soluble acid 11 with various alcohols [22][50][59]. The structure of dyads 2a–d was confirmed by NMR, MALDI MS and UV–vis absorption spectroscopy. 1H NMR spectra of the dyads 2a–d
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Published 07 Oct 2009

Synthesis of novel photochromic pyrans via palladium- mediated reactions

  • Christoph Böttcher,
  • Gehad Zeyat,
  • Saleh A. Ahmed,
  • Elisabeth Irran,
  • Thorben Cordes,
  • Cord Elsner,
  • Wolfgang Zinth and
  • Karola Rueck-Braun

Beilstein J. Org. Chem. 2009, 5, No. 25, doi:10.3762/bjoc.5.25

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  • was investigated by time-resolved absorption spectroscopy in the picosecond time domain. Keywords: benzopyrans; chromenes; naphthopyrans; palladium-mediated coupling reactions; photochromism; Introduction Interest in photoswitchable chromophores for the material and life sciences has increased
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Published 27 May 2009

Synthesis of thienyl analogues of PCBM and investigation of morphology of mixtures in P3HT

  • Fukashi Matsumoto,
  • Kazuyuki Moriwaki,
  • Yuko Takao and
  • Toshinobu Ohno

Beilstein J. Org. Chem. 2008, 4, No. 33, doi:10.3762/bjoc.4.33

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  • thieno[3,2-b]thiophene (3c, 3d) were synthesized and characterized. The morphology of the thin films prepared from the mixtures of these methanofullerenes with regioregular poly(3-hexylthiophene) (P3HT) was investigated by AFM measurement and UV-Vis absorption spectroscopy. A solubility test of these
  • hetero films of these novel methanofullerenes were spin coated on glass substrates and were characterized by using AFM and UV-Vis absorption spectroscopy in order to study and compare their morphological features. 3-BThCBM (3b) and TThCBM (3c) were excluded because their high-concentration solutions
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Published 29 Sep 2008
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