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Search for "photophysical properties" in Full Text gives 196 result(s) in Beilstein Journal of Organic Chemistry.

Transition metal-free oxidative and deoxygenative C–H/C–Li cross-couplings of 2H-imidazole 1-oxides with carboranyl lithium as an efficient synthetic approach to azaheterocyclic carboranes

  • Lidia A. Smyshliaeva,
  • Mikhail V. Varaksin,
  • Pavel A. Slepukhin,
  • Oleg N. Chupakhin and
  • Valery N. Charushin

Beilstein J. Org. Chem. 2018, 14, 2618–2626, doi:10.3762/bjoc.14.240

Graphical Abstract
  • ][19][20][21], as well as unique photophysical properties [22][23][24][25][26]. Thus, the development of effective approaches to azaheterocyclic carboranes is currently considered to be one of the most important synthetic challenges. At present, there are three main synthetic strategies in the design
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Published 12 Oct 2018

Applications of organocatalysed visible-light photoredox reactions for medicinal chemistry

  • Michael K. Bogdos,
  • Emmanuel Pinard and
  • John A. Murphy

Beilstein J. Org. Chem. 2018, 14, 2035–2064, doi:10.3762/bjoc.14.179

Graphical Abstract
  • some basic data of these photocatalysts are presented, to serve as an easy reference to the reader, with respect to their structure, electrochemical and photophysical properties. Figure 3 shows the structures of the various compounds that are used on multiple occasions as photocatalysts in the
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Published 03 Aug 2018

A self-assembled photoresponsive gel consisting of chiral nanofibers

  • Lei Zou,
  • Dan Han,
  • Zhiyi Yuan,
  • Dongdong Chang and
  • Xiang Ma

Beilstein J. Org. Chem. 2018, 14, 1994–2001, doi:10.3762/bjoc.14.174

Graphical Abstract
  • formation of supramolecular structure. To investigate the potential photoresponsiveness of compound 3, the UV–vis absorption spectrum was measured to trace photochemical and photophysical properties of the solution of compound 3 (1.0 × 10−5 M in chloroform). As shown in Figure 2, the azobenzene trans-isomer
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Published 01 Aug 2018

Rational design of boron-dipyrromethene (BODIPY) reporter dyes for cucurbit[7]uril

  • Mohammad A. Alnajjar,
  • Jürgen Bartelmeß,
  • Robert Hein,
  • Pichandi Ashokkumar,
  • Mohamed Nilam,
  • Werner M. Nau,
  • Knut Rurack and
  • Andreas Hennig

Beilstein J. Org. Chem. 2018, 14, 1961–1971, doi:10.3762/bjoc.14.171

Graphical Abstract
  • host-induced protonation and thus to a fluorescence increase. The possibility to tune binding affinities and pKa values is demonstrated and it is shown that, in combination with the beneficial photophysical properties of BODIPYs, several new applications of host–dye reporter pairs can be implemented
  • . Synthesis of BODIPY derivatives. Photophysical properties of the synthesized BODIPY derivatives.a Properties of the CB7–BODIPY host–guest complexes.a Supporting Information Supporting Information File 472: Experimental details and supporting figures. Acknowledgements Financial support from the DFG (HE
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Published 30 Jul 2018

Synthesis and characterization of π–extended “earring” subporphyrins

  • Haiyan Guan,
  • Mingbo Zhou,
  • Bangshao Yin,
  • Ling Xu and
  • Jianxin Song

Beilstein J. Org. Chem. 2018, 14, 1956–1960, doi:10.3762/bjoc.14.170

Graphical Abstract
  • further red-shifted and more intense. This work extends the research of “earring” porphyrins to “earring” subporphyrins. Investigations on their photophysical properties and further functionalization are underway. Partial 1H NMR spectrum of 3. X-ray crystal structures of 3: a) top view; b) side view
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Published 30 Jul 2018

Synthesis of 9-arylalkynyl- and 9-aryl-substituted benzo[b]quinolizinium derivatives by Palladium-mediated cross-coupling reactions

  • Siva Sankar Murthy Bandaru,
  • Darinka Dzubiel,
  • Heiko Ihmels,
  • Mohebodin Karbasiyoun,
  • Mohamed M. A. Mahmoud and
  • Carola Schulzke

Beilstein J. Org. Chem. 2018, 14, 1871–1884, doi:10.3762/bjoc.14.161

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  • protocol for Pd-mediated reactions may be employed for other base-sensitive substrates as well. The photophysical properties as well as the DNA-binding properties of the (arylethynyl)benzo[b]quinolizinium derivatives were studied. It was demonstrated that derivatives 2a–d bind to duplex and quadruplex DNA
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Published 23 Jul 2018

Synthesis and photophysical studies of a multivalent photoreactive RuII-calix[4]arene complex bearing RGD-containing cyclopentapeptides

  • Sofia Kajouj,
  • Lionel Marcelis,
  • Alice Mattiuzzi,
  • Adrien Grassin,
  • Damien Dufour,
  • Pierre Van Antwerpen,
  • Didier Boturyn,
  • Eric Defrancq,
  • Mathieu Surin,
  • Julien De Winter,
  • Pascal Gerbaux,
  • Ivan Jabin and
  • Cécile Moucheron

Beilstein J. Org. Chem. 2018, 14, 1758–1768, doi:10.3762/bjoc.14.150

Graphical Abstract
  • internal cell environment or exert a photocytotoxic activity. The use of lipophilic ligands allows the corresponding ruthenium complexes to passively diffuse inside cells but limits their structural and photophysical properties. Moreover, this strategy does not provide any cell selectivity. This limitation
  • platform. The photophysical properties of this RuII–calixarene conjugate were thus examined and compared to those of the reference complex [Ru(TAP)2phen]2+. Results and Discussion Synthesis of RuII-calixarene conjugate 9 For the synthesis of the target multivalent system, the strategy relies on the
  • integrins. However, the possible H-bonding interactions between neighboring RGD units could be a drawback in view of the accessibility of the arginine groups to interact with the integrins. Photophysical properties of RuII-calixarene conjugate 9 The absorption and emission spectra of Ru-calix(RGD)4
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Published 16 Jul 2018

Metal-free formal synthesis of phenoxazine

  • Gabriella Kervefors,
  • Antonia Becker,
  • Chandan Dey and
  • Berit Olofsson

Beilstein J. Org. Chem. 2018, 14, 1491–1497, doi:10.3762/bjoc.14.126

Graphical Abstract
  • fused between two benzene rings. A range of compounds with interesting biological or photophysical properties contain the phenoxazine core, where the amine moiety is either functionalized or oxidized to the corresponding imine [1][2][3][4]. Phenoxazine derivatives can display antitumor activity [5][6][7
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Published 20 Jun 2018

Recent advances in phosphorescent platinum complexes for organic light-emitting diodes

  • Cristina Cebrián and
  • Matteo Mauro

Beilstein J. Org. Chem. 2018, 14, 1459–1481, doi:10.3762/bjoc.14.124

Graphical Abstract
  • , photophysical properties and OLED performances, Chi, Kim and co-workers analyzed the X-ray structures of Pt(fppz)2 (13) and other related platinum(II) complexes 14 and 15 in both single crystal and thin film samples (Figure 7) [13]. They observed different degrees of crystallinity as a function of the
  • worth to note that this excimeric emission was reduced on increasing the generation of the ancillary ligand, highlighting the importance of this molecular design strategy towards highly efficient dopants. The interesting photophysical properties of these compounds prompted the evaluation of their
  • the dopant was also shown by Strassner and co-workers [36][37][38]. Compared with previously reported imidazolylidene and triazolylidene acetylacetonate (acac) platinum(II) complexes, complexes 12 bearing 1,3-thiazol-2-ylidene carbenes outperformed the former when evaluating the photophysical
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Published 18 Jun 2018

Two novel blue phosphorescent host materials containing phenothiazine-5,5-dioxide structure derivatives

  • Feng-Ming Xie,
  • Qingdong Ou,
  • Qiang Zhang,
  • Jiang-Kun Zhang,
  • Guo-Liang Dai,
  • Xin Zhao and
  • Huai-Xin Wei

Beilstein J. Org. Chem. 2018, 14, 869–874, doi:10.3762/bjoc.14.73

Graphical Abstract
  • time, the photophysical properties, electrochemical properties and their thermal stability were studied and the expected results were obtained. Results and Discussion Synthesis and theoretical calculations The synthesis route for CEPDO and CBPDO is shown in Scheme 1. The detailed synthesis procedures
  • electron-withdrawing ability of the phenothiazine-5,5-dioxide unit, thus realized the orbital separation of hole and electron transport in the same molecule. This indicated CEPDO and CBPDO have bipolar characteristic. Photophysical properties Figure 2 presents the UV–vis absorption, photoluminescence and
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Published 17 Apr 2018

D–A–D-type orange-light emitting thermally activated delayed fluorescence (TADF) materials based on a fluorenone unit: simulation, photoluminescence and electroluminescence studies

  • Lin Gan,
  • Xianglong Li,
  • Xinyi Cai,
  • Kunkun Liu,
  • Wei Li and
  • Shi-Jian Su

Beilstein J. Org. Chem. 2018, 14, 672–681, doi:10.3762/bjoc.14.55

Graphical Abstract
  • vibronic structure [7]. The ΔEST of 1 and 2 are 0.19 and 0.09 eV, respectively, indicating that compound 2 may have a much more efficient RISC process than 2 [19][20] (Table 3). To gain a further understanding of the photophysical properties of 1 and 2 in solid state, two doped films in 4,4’-dicarbazolyl
  • ability to reduce the efficiency roll-off, which comes to the same conclusion with the analysis of their photophysical properties. Conclusion In summary, two novel D–A–D-type orange-emitting TADF materials, namely 2,7-bis(9,9-dimethylacridin-10(9H)-yl)-9H-fluoren-9-one (27DACRFT, 1) and 3,6-bis(9,9
  • DFT and TD-DFT. Photophysical properties of the investigated molecules 1 and 2. Photophysical properties of the 1 and 2 doped in CBP films (8 wt %) at room temperature. Summary of the device performances of the OLEDs based on 1 and 2. Supporting Information Supporting Information File 8: Experimental
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Published 22 Mar 2018

Enhanced quantum yields by sterically demanding aryl-substituted β-diketonate ancillary ligands

  • Rebecca Pittkowski and
  • Thomas Strassner

Beilstein J. Org. Chem. 2018, 14, 664–671, doi:10.3762/bjoc.14.54

Graphical Abstract
  • ][39][40][41]. We herein present the synthesis and photophysical properties of two new C^C* cyclometalated platinum complexes. Both are based on the original 3-methyl-1-phenylimidazolium (MPIM) ligand system which together with the acac auxiliary ligand showed only a very low quantum yield of 7%. We
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Published 21 Mar 2018

Recent advances on organic blue thermally activated delayed fluorescence (TADF) emitters for organic light-emitting diodes (OLEDs)

  • Thanh-Tuân Bui,
  • Fabrice Goubard,
  • Malika Ibrahim-Ouali,
  • Didier Gigmes and
  • Frédéric Dumur

Beilstein J. Org. Chem. 2018, 14, 282–308, doi:10.3762/bjoc.14.18

Graphical Abstract
  • noticed that the photophysical properties and the geometry of molecules that are suspected to be TADF emitters are often investigated by theoretical calculations prior to synthesis, optimizing the chance to get suitable energy levels and the desired ΔEST. This strategy was notably applied to the design of
  • , an analogue of T9, i.e., T12, differing by the removal of a phenyl ring between the carbazole and the triazine units proved once again the crucial role of the oscillator strength in the photophysical properties [51]. Notably, major differences in the separation of their HOMO and LUMO energy levels
  • substitution pattern of the carbazole unit on the photophysical properties. While maintaining the same number of carbazole units on the emitter and by varying the substitution pattern of the carbazole core, only a weak influence on the EL characteristics was evidenced [55]. In fact, performances only varied by
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Published 30 Jan 2018

Synthesis and spectroscopic properties of β-meso directly linked porphyrin–corrole hybrid compounds

  • Baris Temelli and
  • Hilal Kalkan

Beilstein J. Org. Chem. 2018, 14, 187–193, doi:10.3762/bjoc.14.13

Graphical Abstract
  • condensation reaction of meso-substituted dipyrromethanes with β-formylated meso-tetraphenylporphyrins. Spectroscopic and photophysical properties of the new hybrid structures have been determined. Higher quantum yields of some of the synthesized hybrid compounds indicate that these compounds can be considered
  • –corrole hybrid derivatives. *100 mol % of AlCl3 was used as a catalyst. Optimization of the reaction conditions. Photophysical properties of hybrid compounds. Supporting Information Supporting Information File 34: General experimental information, experimental details on the synthesis of products 4 and
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Published 22 Jan 2018

Fluorescent nucleobase analogues for base–base FRET in nucleic acids: synthesis, photophysics and applications

  • Mattias Bood,
  • Sangamesh Sarangamath,
  • Moa S. Wranne,
  • Morten Grøtli and
  • L. Marcus Wilhelmsson

Beilstein J. Org. Chem. 2018, 14, 114–129, doi:10.3762/bjoc.14.7

Graphical Abstract
  • dealing with the synthesis of the key players of base–base FRET, i.e., the base analogue donor and acceptor molecules, the second one dealing with their photophysical properties and the third one dealing with their application in studying nucleic acid-containing systems. Synthesis of fluorescent base
  • protection groups is paramount as an extensive use adds additional steps as well as complexity to the synthesis. The design and synthesis of fluorescent nucleobase analogues (FBAs) add on additional challenges such as obtaining features that introduce useful photophysical properties, for example, extended
  • , the oxo-analogue tCO, which Lin et al. initially prepared in 1995 [41], was re-synthesized in order to characterize its photophysical properties, using the same procedure except that p-toluoyl protecting groups rather than acetyl were used [31]. In 2009, we published the first base–base FRET system
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Published 10 Jan 2018

Halogen-containing thiazole orange analogues – new fluorogenic DNA stains

  • Aleksey A. Vasilev,
  • Meglena I. Kandinska,
  • Stanimir S. Stoyanov,
  • Stanislava B. Yordanova,
  • David Sucunza,
  • Juan J. Vaquero,
  • Obis D. Castaño,
  • Stanislav Baluschev and
  • Silvia E. Angelova

Beilstein J. Org. Chem. 2017, 13, 2902–2914, doi:10.3762/bjoc.13.283

Graphical Abstract
  • atoms (connected directly to the chromophore or as side groups) on the molar absorptivity and the fluorescence intensity of a series of new TO analogues. Photophysical properties of a series of TO analogues that have fluoro- or trifluoromethyl groups connected to the heterocyclic end groups of the
  • chromophores have been studied by Armitage and co-workers [42][43]. According to these studies the fluorination of the symmetrical [42] and unsymmetrical [43] cyanine dyes results in reduced aggregation and significantly improved the photostability and photophysical properties of the dyes. The authors [43
  • for the success of the reaction because of the CH-acidity of the benzyl fragment, which otherwise leads to the possibility of side reactions if trimethylamine or other less hindered basic reagents are employed. Photophysical properties Absorption The longest wavelength absorption maxima of the studied
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Published 28 Dec 2017

Pyrene–nucleobase conjugates: synthesis, oligonucleotide binding and confocal bioimaging studies

  • Artur Jabłoński,
  • Yannic Fritz,
  • Hans-Achim Wagenknecht,
  • Rafał Czerwieniec,
  • Tytus Bernaś,
  • Damian Trzybiński,
  • Krzysztof Woźniak and
  • Konrad Kowalski

Beilstein J. Org. Chem. 2017, 13, 2521–2534, doi:10.3762/bjoc.13.249

Graphical Abstract
  • at ambient temperature. The absorption and emission spectra of the adenine derivatives 3 and 5 are reproduced in Figure 4. The photophysical properties of 5 (Figure 4a) resemble the properties of unsubstituted pyrene [30]. In the low energy UV and blue spectral region between 250 and 400 nm, three
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Published 28 Nov 2017

One-pot syntheses of blue-luminescent 4-aryl-1H-benzo[f]isoindole-1,3(2H)-diones by T3P® activation of 3-arylpropiolic acids

  • Melanie Denißen,
  • Alexander Kraus,
  • Guido J. Reiss and
  • Thomas J. J. Müller

Beilstein J. Org. Chem. 2017, 13, 2340–2351, doi:10.3762/bjoc.13.231

Graphical Abstract
  • are often prepared by condensation of acid anhydrides and amines [34]. Their applications are widespread, ranging from pharmaceutically active compounds [35] to agrochemicals [36] and fluorophores [37]. The characteristic photophysical properties of 1,8- and 2,3-naphthalene imides render the substance
  • -dihydro-1H-benzo[f]isoindolyl moiety in 6 are absolutely planar. Photophysical properties The pseudo three-component synthesis of 1H-benzo[f]isoindole-1,3(2H)-diones 4 furnishes a substance library with electronically diverse substitution patterns and already upon eyesight several derivatives are
  • -benzo[f]isoindole-1,3(2H)-diones 4. Variation of the amine 3 in pseudo three-component syntheses of 1H-benzo[f]isoindole-1,3(2H)-diones 4. Selected photophysical properties (absorption and emission maxima,a,b fluorescence quantum yields (Φf [53]),c and Stokes shifts Δd) of compounds 4a–g,m,n,s, 5, and 6
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Published 03 Nov 2017

Synthesis and photophysical properties of novel benzophospholo[3,2-b]indole derivatives

  • Mio Matsumura,
  • Mizuki Yamada,
  • Atsuya Muranaka,
  • Misae Kanai,
  • Naoki Kakusawa,
  • Daisuke Hashizume,
  • Masanobu Uchiyama and
  • Shuji Yasuike

Beilstein J. Org. Chem. 2017, 13, 2304–2309, doi:10.3762/bjoc.13.226

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  • contrast, these angles around the phosphorus atom were 291.05° for 3, and 305.46° and 304.75° for 4. These facts indicate that the nitrogen atoms are sp2-hybridized, and the phosphorus center adopts pyramidal for 3 and tetrahedral geometry for 4. The photophysical properties of the benzophospholo[3,2-b
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Published 30 Oct 2017

Regioselective (thio)carbamoylation of 2,7-di-tert-butylpyrene at the 1-position with iso(thio)cyanates

  • Anna Wrona-Piotrowicz,
  • Marzena Witalewska,
  • Janusz Zakrzewski and
  • Anna Makal

Beilstein J. Org. Chem. 2017, 13, 1032–1038, doi:10.3762/bjoc.13.102

Graphical Abstract
  • photophysical properties [4][10][13][14][15][16][17][18][19][20], we thought it would be of interest to study its reactivity in the above reaction (and to extend its scope for isocyanates). An additional reason for such a study was the fact that thioamides (and amides) are versatile starting materials in the
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Published 29 May 2017

Ultrasound-promoted organocatalytic enamine–azide [3 + 2] cycloaddition reactions for the synthesis of ((arylselanyl)phenyl-1H-1,2,3-triazol-4-yl)ketones

  • Gabriel P. Costa,
  • Natália Seus,
  • Juliano A. Roehrs,
  • Raquel G. Jacob,
  • Ricardo F. Schumacher,
  • Thiago Barcellos,
  • Rafael Luque and
  • Diego Alves

Beilstein J. Org. Chem. 2017, 13, 694–702, doi:10.3762/bjoc.13.68

Graphical Abstract
  • ][40][41][42][43], photophysical properties [44][45][46][47][48][49] and interesting biological activities [50][51][52]. An interesting class of molecules are the selanyl-1,2,3-triazoles [53][54][55][56][57][58][59][60][61] which can present some biological applications. As example, 4-phenyl-1
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Published 11 Apr 2017

Novel β-cyclodextrin–eosin conjugates

  • Gábor Benkovics,
  • Damien Afonso,
  • András Darcsi,
  • Szabolcs Béni,
  • Sabrina Conoci,
  • Éva Fenyvesi,
  • Lajos Szente,
  • Milo Malanga and
  • Salvatore Sortino

Beilstein J. Org. Chem. 2017, 13, 543–551, doi:10.3762/bjoc.13.52

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  • conditions, is rather polydisperse and differently sized populations can be detected. The strong aggregation character of 4–β-CD can remarkably influence the spectroscopic and photophysical properties of the conjugate. UV–vis spectroscopic and photophysical properties of eosin–β-CD conjugates Preliminary
  • preservation of the photophysical properties of the dye. In fact, this molecular hybrid exhibits satisfactory fluorescence and 1O2 photogeneration quantum yields making it a suitable candidate for biomedical research studies in the field of imaging and PDT applications. The possibility to exploit the CD cavity
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Published 15 Mar 2017

Synthesis and optical properties of new 5'-aryl-substituted 2,5-bis(3-decyl-2,2'-bithiophen-5-yl)-1,3,4-oxadiazoles

  • Anastasia S. Kostyuchenko,
  • Tatyana Yu. Zheleznova,
  • Anton J. Stasyuk,
  • Aleksandra Kurowska,
  • Wojciech Domagala,
  • Adam Pron and
  • Alexander S. Fisyuk

Beilstein J. Org. Chem. 2017, 13, 313–322, doi:10.3762/bjoc.13.34

Graphical Abstract
  • observed in D–A–D-type conjugated molecules [28]. DFT calculations To gain a deeper understanding of the electronic and photophysical properties of the synthesized 5'-aryl-substituted 2,5-bis(3-decyl-2,2'-bithiophen-5-yl)-1,3,4-oxadiazoles we have performed quantum-chemical calculations for four
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Published 17 Feb 2017

Interactions between photoacidic 3-hydroxynaphtho[1,2-b]quinolizinium and cucurbit[7]uril: Influence on acidity in the ground and excited state

  • Jonas Becher,
  • Daria V. Berdnikova,
  • Darinka Dzubiel,
  • Heiko Ihmels and
  • Phil M. Pithan

Beilstein J. Org. Chem. 2017, 13, 203–212, doi:10.3762/bjoc.13.23

Graphical Abstract
  • ]. Conclusion In summary we introduced a novel quinolizinium-based photoacid whose acidity in the ground and excited state can be changed by the association with CB[7]. With this result we demonstrated that in general the acidic functionality as well as the photophysical properties of hydroxyquinolizinium
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Published 01 Feb 2017

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

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  • terpyridine fragments are involved in π–π interactions (3.56–3.66 Å). The separation between the neighboring azulenyl moieties is higher than 3.85 Å. Photophysical properties The photophysical properties of the azulene-containing terpyridines, 4a and 4b have been investigated by absorption and emission
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Published 11 Aug 2016
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