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Search for "UV–vis spectra" in Full Text gives 239 result(s) in Beilstein Journal of Organic Chemistry. Showing first 200.

Complexation of molecular clips containing fragments of diphenylglycoluril and benzocrown ethers with paraquat and its derivatives

  • Leonid S. Kikot',
  • Catherine Yu. Kulygina,
  • Alexander Yu. Lyapunov,
  • Svetlana V. Shishkina,
  • Roman I. Zubatyuk,
  • Tatiana Yu. Bogaschenko and
  • Tatiana I. Kirichenko

Beilstein J. Org. Chem. 2017, 13, 2056–2067, doi:10.3762/bjoc.13.203

Graphical Abstract
  • analysis of UVvis spectra could also provide qualitative information on the formation of inclusion complexes in solution. The addition of guests 7–10 to a solution of clips 1–5 turns the colourless solution to yellow, and a new wide absorption band (370–560 nm) appears. The new band was assigned to a
  • , Supporting Information File 1). Typical changes in the UVvis spectra during the titration of clip 2 with paraquat (7) are presented in Figure 4. The data obtained for molecular clips 1–3 are best described by titration curves corresponding to 1:1, and for clips 4 and 5 – to 1:1 and 1:2 complexes. Stability
  • , v/v) of (a) free host 3, (b) 3 and 1.0 equiv of 7, and (c) free guest 7. The changes observed in the UVvis spectra during the titration of clip 2 with paraquat (7) in acetonitrile at 20 °C. The labels near each plot correspond to the equivalents of paraquat (7) added. Stability constant dependence
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Published 04 Oct 2017

β-Cyclodextrin- and adamantyl-substituted poly(acrylate) self-assembling aqueous networks designed for controlled complexation and release of small molecules

  • Liang Yan,
  • Duc-Truc Pham,
  • Philip Clements,
  • Stephen F. Lincoln,
  • Jie Wang,
  • Xuhong Guo and
  • Christopher J. Easton

Beilstein J. Org. Chem. 2017, 13, 1879–1892, doi:10.3762/bjoc.13.183

Graphical Abstract
  • spectroscopy The UVvis spectra were recorded with a Cary-Varian 5000 UV–vis spectrophotometer using 1 cm path length matched quartz cells. All UV–vis titrations were performed in aqueous Na2HPO4/KH2PO4 buffer at pH 7.0 and I = 0.10 mol dm−3 at 298.2 K. For the β-CD/dye titrations, 50 mm3 aliquots of a β-CD
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Published 07 Sep 2017

Direct catalytic arylation of heteroarenes with meso-bromophenyl-substituted porphyrins

  • Alexei N. Kiselev,
  • Olga K. Grigorova,
  • Alexei D. Averin,
  • Sergei A. Syrbu,
  • Oskar I. Koifman and
  • Irina P. Beletskaya

Beilstein J. Org. Chem. 2017, 13, 1524–1532, doi:10.3762/bjoc.13.152

Graphical Abstract
  • tatraarylated derivatives. The investigation of the UVvis spectra of the arylated monophenylporphyrins 3–9 disclosed that they possess almost identical absorption maxima but somewhat differ in extinction values primarily due to the different sharpness of the bands (Table 4). The Soret band at 406 nm is
  • bromophenylporphyrinate. The UVvis spectra of diphenylporphyrins 13–15 (Table 4) possess absorption bands in the same region as their monophenyl analogues 3–9, but all maxima are slightly red-shifted. It fully corresponds with the absorption bands of the bis(4-bromophenyl)porphyrin 11 (λmax 575 (lgε 3.16), 540 (lgε 3.38
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Published 03 Aug 2017

Switchable highly regioselective synthesis of 3,4-dihydroquinoxalin-2(1H)ones from o-phenylenediamines and aroylpyruvates

  • Juraj Dobiaš,
  • Marek Ondruš,
  • Gabriela Addová and
  • Andrej Boháč

Beilstein J. Org. Chem. 2017, 13, 1350–1360, doi:10.3762/bjoc.13.132

Graphical Abstract
  • )-one system. The keto–enamine arrangement in 3 is capable of specific binding of Cu(II) ions like in 4, which was proved by red shifts in the UVvis spectra [6][7][8]. The pseudo ring can also accommodate BF2 moiety, yielding compounds like 5 with interesting fluorescent properties [9][10]. Compounds 3
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Published 10 Jul 2017

Molecular-level architectural design using benzothiadiazole-based polymers for photovoltaic applications

  • Vinila N. Viswanathan,
  • Arun D. Rao,
  • Upendra K. Pandey,
  • Arul Varman Kesavan and
  • Praveen C. Ramamurthy

Beilstein J. Org. Chem. 2017, 13, 863–873, doi:10.3762/bjoc.13.87

Graphical Abstract
  • . The UVvis spectra of annealed films of the polymers at 130 °C show an apparent red shift in the onset absorption because of an increased aggregation of the polymer chains upon heating. The optical band gaps of P1, P2, and P3 were calculated from the onset of the absorption as 1.95 eV, 1.93 eV and
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Published 10 May 2017

Derivatives of the triaminoguanidinium ion, 5. Acylation of triaminoguanidines leading to symmetrical tris(acylamino)guanidines and mesoionic 1,2,4-triazolium-3-aminides

  • Jan Szabo,
  • Julian Greiner and
  • Gerhard Maas

Beilstein J. Org. Chem. 2017, 13, 579–588, doi:10.3762/bjoc.13.57

Graphical Abstract
  • , the δ(C-5) value in 7d corresponds to the deshielding α-effect of a methyl group, if one takes the δ-value of the unsubstituted C-5 carbon nucleus in II as a reference. The UVvis spectra of 7a–d are presented in Figure 5. One notes an increasingly bathochromic shift of the long-wavelength absorption
  • , N4H···N11 2.061(1) Å; <(N4–H···N11) 168.7(2)°. UVvis spectra of 7a–d in chloroform (c = 0.04 mmol L−1); λmax [nm] (ε [L mol−1 cm−1]): 7a: 350 (4710); 7b: 350 (5080); 7c: 430 (3510); 7d: 300 (2670). Reactions of aminoguanidines with carboxylic acids and acid chlorides. The structural formulae shown
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Published 22 Mar 2017

Pd- and Cu-catalyzed approaches in the syntheses of new cholane aminoanthraquinone pincer-like ligands

  • Nikolay V. Lukashev,
  • Gennadii A. Grabovyi,
  • Dmitry A. Erzunov,
  • Alexey V. Kazantsev,
  • Gennadij V. Latyshev,
  • Alexei D. Averin and
  • Irina P. Beletskaya.

Beilstein J. Org. Chem. 2017, 13, 564–570, doi:10.3762/bjoc.13.55

Graphical Abstract
  • jellyfish resembling receptors (b) [11][16]. UVvis spectra of 5c (50 μM solution in MeCN) before and after the addition of 5 equiv of metal perchlorates. Example of Pd-catalyzed amination for modification of bile acid derivatives. Synthesis of 24-aminocholanols. Synthesis of 24-arylaminocholanols by Cu
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Published 20 Mar 2017

Spectral and DFT studies of anion bound organic receptors: Time dependent studies and logic gate applications

  • Srikala Pangannaya,
  • Neethu Padinchare Purayil,
  • Shweta Dabhi,
  • Venu Mankad,
  • Prafulla K. Jha,
  • Satyam Shinde and
  • Darshak R. Trivedi

Beilstein J. Org. Chem. 2017, 13, 222–238, doi:10.3762/bjoc.13.25

Graphical Abstract
  • corresponding UVvis spectra are shown in Supporting Information File 1, Figures S19 and S20. There was no remarkable colorimetric response in the presence of the other cations tested in the current study. In case of receptor R2 no color change was observed in the presence of the cations implying its role as an
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Published 06 Feb 2017

Efficient access to β-vinylporphyrin derivatives via palladium cross coupling of β-bromoporphyrins with N-tosylhydrazones

  • Vinicius R. Campos,
  • Ana T. P. C. Gomes,
  • Anna C. Cunha,
  • Maria da Graça P. M. S. Neves,
  • Vitor F. Ferreira and
  • José A. S. Cavaleiro

Beilstein J. Org. Chem. 2017, 13, 195–202, doi:10.3762/bjoc.13.22

Graphical Abstract
  • -brominated porphyrin 1 and N-tosylhydrazones 2a–c. Results obtained in the palladium-catalyzed cross-coupling reactions between β-brominated porphyrin 1 with N-tosylhydrazones 2a–c. Supporting Information Supporting Information File 46: Copies of NMR, HRMS(ESI) and UVvis spectra of the new derivatives
  • ) using CHCl3 as solvent. For the reactions under MW irradiation a CEM Microwave Synthesis System Discover SP was used, under constant magnetic stirring (controlled by the microwave equipment) by employing an irradiation power of 200 W till the reaction temperature (120 °C) was achieved. The UVvis
  • spectra were recorded on an UV-2501 PC Shimadzu spectrophotometer using CHCl3 as solvent. Flash chromatography was carried out using silica gel (230–400 mesh) and preparative thin-layer chromatography was carried out on 20 × 20 cm glass plates coated with silica gel (1 mm thick). The reactions were
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Published 30 Jan 2017

3D printed fluidics with embedded analytic functionality for automated reaction optimisation

  • Andrew J. Capel,
  • Andrew Wright,
  • Matthew J. Harding,
  • George W. Weaver,
  • Yuqi Li,
  • Russell A. Harris,
  • Steve Edmondson,
  • Ruth D. Goodridge and
  • Steven D. R. Christie

Beilstein J. Org. Chem. 2017, 13, 111–119, doi:10.3762/bjoc.13.14

Graphical Abstract
  • selected because it would run smoothly at room temperature, and a mild solvent mixture such as methanol and water (MeOH/water) could be used with the less solvent-compatible parts. Differences between the UVvis spectra of the starting material and the product can be used to follow the reaction
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Published 18 Jan 2017

Enzymatic synthesis and phosphorolysis of 4(2)-thioxo- and 6(5)-azapyrimidine nucleosides by E. coli nucleoside phosphorylases

  • Vladimir A. Stepchenko,
  • Anatoly I. Miroshnikov,
  • Frank Seela and
  • Igor A. Mikhailopulo

Beilstein J. Org. Chem. 2016, 12, 2588–2601, doi:10.3762/bjoc.12.254

Graphical Abstract
  • obtained from commercial suppliers and were used without further purification. The NMR and UVvis spectra were recorded on Brucker Avance 500-DRX (Bruker, Germany) and Carry 100 spectrometers (Varian, USA), respectively. TLC was performed on TLC aluminium sheets covered with silica gel 60 F254. Low
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Published 01 Dec 2016

Methylenelactide: vinyl polymerization and spatial reactivity effects

  • Judita Britner and
  • Helmut Ritter

Beilstein J. Org. Chem. 2016, 12, 2378–2389, doi:10.3762/bjoc.12.232

Graphical Abstract
  • ) with AIBN (A) and without initiator (B). UVvis spectra of the reaction mixture with DPPH radical at the beginning (violet line, 0.23 mM) of the self-initiated polymerization of MLA and after 15 h (yellow line) in a range from 380–800 nm (cMLA = 1.8 mol L−1, 70 °C). Copolymer composition curves for the
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Published 14 Nov 2016

High performance p-type molecular electron donors for OPV applications via alkylthiophene catenation chromophore extension

  • Paul B. Geraghty,
  • Calvin Lee,
  • Jegadesan Subbiah,
  • Wallace W. H. Wong,
  • James L. Banal,
  • Mohammed A. Jameel,
  • Trevor A. Smith and
  • David J. Jones

Beilstein J. Org. Chem. 2016, 12, 2298–2314, doi:10.3762/bjoc.12.223

Graphical Abstract
  • at around 570 nm, therefore indicating that the underlying packing structures are not significantly altered through side-chain substitution. To better understand the annealing process UVvis spectra have been replotted for each material, see Figure 6 (and Supporting Information File 1, Figures S9.1
  • those used to collect the UVvis spectra above, with selected graphs shown in Figure 7, and extracted data in Table 2. The full spectra are presented in Supporting Information File 1, Figure S9.3. The as-cast films do not contain simple symmetric emission bands, indicating a significant level of
  • obtain the UVvis spectra, were heated to above the NLC phase change temperature, and collected fluorescence emission spectra are shown in Figure 10. It is clear that when the thin films are heated to 220 °C, i.e., above the NLC phase change temperature, a second blue shifted peak appears at 730 nm
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Published 02 Nov 2016

Thiophene-forming one-pot synthesis of three thienyl-bridged oligophenothiazines and their electronic properties

  • Dominik Urselmann,
  • Konstantin Deilhof,
  • Bernhard Mayer and
  • Thomas J. J. Müller

Beilstein J. Org. Chem. 2016, 12, 2055–2064, doi:10.3762/bjoc.12.194

Graphical Abstract
  • S4). In addition this behavior underlines that no aggregation of the molecules has to be taken into account at the concentration level of absorption and emission spectroscopy. In the UVvis spectra, most characteristically, four absorption bands are found, three at shorter wavelengths arising from
  • match of experimentally and computationally determined absorption bands cannot be expected for conformationally flexible complex molecules with extended π-conjugation, the trend of the longest wavelength absorption bands from the UVvis spectra is correctly reproduced. Furthermore, for all three methods
  • oligophenothiazines 3a, 3b, and 3c, computed UVvis spectra of ZINDO-CI and TD-DFT (B3LYP, CAM-B3LYP) calculated structures of 3a, 3b, and 3c, computed FMOs (frontier molecular orbitals) of the calculated structures 3a, 3b, and 3c. Supporting Information File 272: Experimental and analytical data. Acknowledgements
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Published 20 Sep 2016

Synthesis and properties of fluorescent 4′-azulenyl-functionalized 2,2′:6′,2″-terpyridines

  • Adrian E. Ion,
  • Liliana Cristian,
  • Mariana Voicescu,
  • Masroor Bangesh,
  • Augustin M. Madalan,
  • Daniela Bala,
  • Constantin Mihailciuc and
  • Simona Nica

Beilstein J. Org. Chem. 2016, 12, 1812–1825, doi:10.3762/bjoc.12.171

Graphical Abstract
  • (working solution obtained by dilution with water). UVvis spectra were recorded after each addition on a Varian Cary 100 spectrophotometer using 1 cm quarts cells and methanol/water as solvent. The fluorescence emission and excitation spectra were recorded with a Jasco FP-6500 spectrofluorometer equipped
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Published 11 Aug 2016

Amidofluorene-appended lower rim 1,3-diconjugate of calix[4]arene: synthesis, characterization and highly selective sensor for Cu2+

  • Rahman Hosseinzadeh,
  • Mohammad Nemati,
  • Reza Zadmard and
  • Maryam Mohadjerani

Beilstein J. Org. Chem. 2016, 12, 1749–1757, doi:10.3762/bjoc.12.163

Graphical Abstract
  • , Figures S1–S11). General procedure for UV–vis experiments The evaluation of cation-ligand interaction was performed with UV–vis spectroscopy. The UV–vis measurement of receptor L in CH3CN exhibited three absorption peaks at 282, 290, and 314 nm. Furthermore, the variation of UVvis spectra was monitored
  • spectrometer. CDCl3 and CD3CN were used as NMR solvents and TMS as internal standard. High-resolution mass spectra (HRMS) were recorded on a Qstar ESI-q-TOF mass spectrometer (Applied Biosystems, Darmstadt, Germany). SPEKOL 2000 Analytik Jena spectrometer were used for recording of UVvis spectra in
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Published 04 Aug 2016

From N-vinylpyrrolidone anions to modified paraffin-like oligomers via double alkylation with 1,8-dibromooctane: access to covalent networks and oligomeric amines for dye attachment

  • Daniela Obels,
  • Melanie Lievenbrück and
  • Helmut Ritter

Beilstein J. Org. Chem. 2016, 12, 1395–1400, doi:10.3762/bjoc.12.133

Graphical Abstract
  • . The synthesis was carried out under mild conditions with a slight excess of DFA to achieve high conversions. Therefore, the 1H NMR and UVvis spectra, respectively still showed signals of ca. 20 mol % of DFA [43] and the corresponding data are given in Supporting Information File 1. The second fluoro
  • the anthraquinone dye [44]. Thus, this reaction can also be followed with the naked eye. Furthermore, the conversion of oligomer 6 was verified with UV–vis spectroscopy (Figure 2). Accordingly, the different UVvis spectra (Figure 2) of DFA, oligomer 5 and the disubstituted anthraquinone dye in 6
  • water swellable network 3a and 3b. Photographs of water-swollen polymer disks consisting of 1 mol % (3a) and 2.5 mol % (3b) of 2a as cross linker. UVvis spectra of oligomers 5 (c = 0.16 g/mL, red), 6 (c = 0.63 g/mL, blue) and DFA (c = 0.016 g/mL, grey). Alkylation of N-VP with 1,8-dibromooctane
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Published 06 Jul 2016

On the mechanism of imine elimination from Fischer tungsten carbene complexes

  • Philipp Veit,
  • Christoph Förster and
  • Katja Heinze

Beilstein J. Org. Chem. 2016, 12, 1322–1333, doi:10.3762/bjoc.12.125

Graphical Abstract
  • S27). In full accordance with the above observations, UVvis spectra recorded during the thermal treatment of W(CO)5(E-2) in toluene (100 °C) show the clean decay of the characteristic bands of W(CO)5(E-2) at 360 and 391 nm. The ferrocene based absorption band around 500 nm remains essentially
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Published 27 Jun 2016

The role of alkyl substituents in deazaadenine-based diarylethene photoswitches

  • Christopher Sarter,
  • Michael Heimes and
  • Andres Jäschke

Beilstein J. Org. Chem. 2016, 12, 1103–1110, doi:10.3762/bjoc.12.106

Graphical Abstract
  • other spectra are presented in Supporting Information File 1 Figures S1–S5. Figure 2 and Figure S1 (Supporting Information File 1) show the changes in the UVvis spectra upon irradiation with UV light (366 nm, hand lamp) in acetonitrile. Three differences are immediately apparent between the two classes
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Published 01 Jun 2016

Stimuli-responsive HBPS-g-PDMAEMA and its application as nanocarrier in loading hydrophobic molecules

  • Yongsheng Chen,
  • Li Wang,
  • Haojie Yu,
  • Zain-Ul-Abdin,
  • Ruoli Sun,
  • Guanghui Jing,
  • Rongbai Tong and
  • Zheng Deng

Beilstein J. Org. Chem. 2016, 12, 939–949, doi:10.3762/bjoc.12.92

Graphical Abstract
  • 400M spectrometer. The molecular weight of polymer was determined by gel permeation chromatography (GPC) (Waters-Wyatt) equipped with RI, UV, viscosity and LS detectors using tetrahydrofuran (THF) as eluent. The UVvis spectra were recorded on a UV3802 (UNICO) ultraviolet spectrophotometer. The size
  • ) PDI of HBPS-g-PDMAEMA as function of the temperature in aqueous solutions with pH 7.4 and 8.5. (A) The UVvis spectra of HBPS-g-PDMAEMA/pyrene solution with different polymer concentrations; (B) the absorption at 337 nm of HBPS-g-PDMAEMA/pyrene solution with different polymer concentrations. (C)The
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Published 10 May 2016

Separation and identification of indene–C70 bisadduct isomers

  • Bolong Zhang,
  • Jegadesan Subbiah,
  • David J. Jones and
  • Wallace W. H. Wong

Beilstein J. Org. Chem. 2016, 12, 903–911, doi:10.3762/bjoc.12.88

Graphical Abstract
  • ] and C70 bis-malonate isomers [17], was expected to provide further information on adduct configurations. The UVvis spectra of fractions 1, 2 and 3 showed very similar spectral features when compared with the spectrum of the 5 o’clock isomer of C70 bis-malonate, suggesting that they are all 5 o’clock
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Published 06 May 2016

Indenopyrans – synthesis and photoluminescence properties

  • Andreea Petronela Diac,
  • Ana-Maria Ţepeş,
  • Albert Soran,
  • Ion Grosu,
  • Anamaria Terec,
  • Jean Roncali and
  • Elena Bogdan

Beilstein J. Org. Chem. 2016, 12, 825–834, doi:10.3762/bjoc.12.81

Graphical Abstract
  • lattice, along with an emission-band broadening, as compared to the solution fluorescence spectra. Keywords: indenopyran-3-ones; organic fluorophores; pyrones; solid-state emission spectra; solution emission spectra; UVvis spectra; Introduction Indenopyrans are functionalized oxygen-containing
  • , Supporting Information File 1) exhibit characteristic signals for the aliphatic protons: one singlet at 4.19 ppm for derivative 5c and one signal at 3.97 ppm for compound 4c, respectively. Next, the photoluminescence properties of the isolated indenopyrones 4c, 5c and 6a were investigated. The UVvis spectra
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Published 27 Apr 2016

Syntheses of dibenzo[d,d']benzo[2,1-b:3,4-b']difuran derivatives and their application to organic field-effect transistors

  • Minh Anh Truong and
  • Koji Nakano

Beilstein J. Org. Chem. 2016, 12, 805–812, doi:10.3762/bjoc.12.79

Graphical Abstract
  • quantum yield (Φ = 61% in CHCl3 solution). To investigate the structure–property relationship of DBBDFs and DNBDFs, the optical properties of syn-DBBDF 5 and syn-DNBDF 6 were compared with those of anti-DBBDF 3 and anti-DNBDF 4. The UVvis spectra of anti-DBBDF 3 and anti-DNBDF 4 were reported to show
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Published 26 Apr 2016

Interactions between 4-thiothymidine and water-soluble cyclodextrins: Evidence for supramolecular structures in aqueous solutions

  • Vito Rizzi,
  • Sergio Matera,
  • Paola Semeraro,
  • Paola Fini and
  • Pinalysa Cosma

Beilstein J. Org. Chem. 2016, 12, 549–563, doi:10.3762/bjoc.12.54

Graphical Abstract
  • almost catalytic effect of glucose. It is noteworthy that the same experiments performed adding glucose at ratios S4TdR/glucose of 1:1, 1:5, and 1:10 did not show any influence on the UVvis spectra of S4TdR aqueous solutions (data not shown). In conclusion the synergic use of UV–vis measurements and CV
  • S4TdR was necessary in order to detect significant signals in measurements. UV–vis measurements were carried out using a S4TdR concentration of 1 × 10−5 M. Before use, these solutions were maintained under agitation for 10 min at room temperature. Analysis UV–vis measurements UVvis spectra were
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Published 21 Mar 2016

New synthetic strategies for xanthene-dye-appended cyclodextrins

  • Milo Malanga,
  • Andras Darcsi,
  • Mihaly Balint,
  • Gabor Benkovics,
  • Tamas Sohajda and
  • Szabolcs Beni

Beilstein J. Org. Chem. 2016, 12, 537–548, doi:10.3762/bjoc.12.53

Graphical Abstract
  • inexpensive dyes, we prepared rhodamine- and fluorescein-appended cyclodextrins. The compounds were characterized by NMR and IR spectroscopy and MS spectrometry, their UVvis spectra were recorded at various pH, and their purity was determined by capillary electrophoresis. Two potential models for the
  • that the fluorophore in Rho-β-CD is (if isolated according to the procedure reported in the Experimental section) in a nonfluorescent cyclic form. The same conclusion can be also reached through the analysis of the UVvis spectra (Supporting Information File 1, Figure S16). The UVvis spectra of Rho-β
  • of Flu-β-CD In Supporting Information File 1, Figure S18, the UVvis spectra of fluorescein disodium salt and of Flu-β-CD are shown. Under acidic conditions (at pH 3), the UV–vis spectrum and the fluorescence of the free dye changes remarkably. In particular, the UV band at around 490 nm is almost
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Published 17 Mar 2016
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