Photochemically assisted synthesis of phenacenes fluorinated at the terminal benzene rings and their electronic spectra

• Yuuki Ishii,
• Minoru Yamaji,
• Fumito Tani,
• Kenta Goto,
• Yoshihiro Kubozono and
• Hideki Okamoto

Beilstein J. Org. Chem. 2025, 21, 670–679, doi:10.3762/bjoc.21.53

• ][11][12], luminophores in light-emitting devices [13][14][15], organic semiconductors [16][17][18], and even as aromatic superconductors [19]. Later, parent and chemically modified phenacenes were applied to active layers in high-performance organic field-effect transistors. Thus, the phenacene

Red light excitation: illuminating photocatalysis in a new spectrum

• Lucas Fortier,
• Corentin Lefebvre and
• Norbert Hoffmann

Beilstein J. Org. Chem. 2025, 21, 296–326, doi:10.3762/bjoc.21.22

•  4d) [30]. In a continuation of this trend, a recent study by O. S. Wenger et al. further expands the frontiers of red-light photoredox catalysis with first-row transition metals by introducing Cr(0) luminophores that exhibit photophysical properties competitive with Ru(II) and Os(II) complexes [31

New one-pot synthesis of 4-arylpyrazolo[3,4-b]pyridin-6-ones based on 5-aminopyrazoles and azlactones

• Vladislav Yu. Shuvalov,
• Ekaterina Yu. Vlasova,
• Tatyana Yu. Zheleznova and
• Alexander S. Fisyuk

Beilstein J. Org. Chem. 2023, 19, 1155–1160, doi:10.3762/bjoc.19.83

• ). Their diluted alcohol solutions luminesce with a quantum yield of 0.09–0.23. Pyrazolo[3,4-b]pyridinones 4a–i, 9a, and 10a are characterized by an abnormally high Stokes shift (107–152 nm, 1.07–1.49 eV, Table 2). Such luminophores, which are colorless in daylight but become colored when irradiated with

Computational model predicts protein binding sites of a luminescent ligand equipped with guanidiniocarbonyl-pyrrole groups

• Neda Rafieiolhosseini,
• Matthias Killa,
• Thorben Neumann,
• Niklas Tötsch,
• Jean-Noël Grad,
• Alexander Höing,
• Thies Dirksmeyer,
• Jochen Niemeyer,
• Christian Ottmann,
• Shirley K. Knauer,
• Michael Giese,
• Jens Voskuhl and
• Daniel Hoffmann

Beilstein J. Org. Chem. 2022, 18, 1322–1331, doi:10.3762/bjoc.18.137

• interactions with other proteins. Here, we use a computational approach to predict the binding sites of the designed hybrid compound featuring aggregation-induced emission luminophores as a potential supramolecular ligand for 14-3-3ζ in the presence and absence of C-Raf peptides. Our results suggest that the

• prediction of two C2 related, dominating binding sites on 14-3-3ζ that may bind to two of the supramolecular ligand molecules. Keywords: AIE luminophores; fluorescence emission; guanidiniocarbonyl-pyrrole; ligand binding; 14-3-3 protein; Introduction The 14-3-3 protein family was one of the first

• novel luminophores tailor-made for different applications. One unique, promising class of compounds, the so-called aggregation-induced emitters (AIE) have been used for a wide range of applications, e.g., in OLEDs, liquid crystals [17], stimuli responses, bioassays, protein and ion detection or imaging

Naphthalonitriles featuring efficient emission in solution and in the solid state

• Sidharth Thulaseedharan Nair Sailaja,
• Iván Maisuls,
• Jutta Kösters,
• Alexander Hepp,
• Andreas Faust,
• Jens Voskuhl and
• Cristian A. Strassert

Beilstein J. Org. Chem. 2020, 16, 2960–2970, doi:10.3762/bjoc.16.246

• ); Introduction Highly emissive organic photoactive materials have attracted great attention due to their extensive practical and potential applications in the fields of optoelectronic devices, chemosensors and bioprobes [1][2][3][4][5][6][7][8]. Generally, organic luminophores are mainly composed of planar

Dawn of a new era in industrial photochemistry: the scale-up of micro- and mesostructured photoreactors

• Emine Kayahan,
• Mathias Jacobs,
• Leen Braeken,
• Leen C.J. Thomassen,
• Simon Kuhn,
• Tom van Gerven and
• M. Enis Leblebici

Beilstein J. Org. Chem. 2020, 16, 2484–2504, doi:10.3762/bjoc.16.202

Clickable azide-functionalized bromoarylaldehydes – synthesis and photophysical characterization

• Dominik Göbel,
• Marius Friedrich,
• Enno Lork and
• Boris J. Nachtsheim

Beilstein J. Org. Chem. 2020, 16, 1683–1692, doi:10.3762/bjoc.16.139

• emission behavior. Keywords: bromoarylaldehydes; click-chemistry; fluorenes; fluorescence; phosphorescence; Introduction Small organic luminophores exhibiting room-temperature phosphorescence (RTP) have attracted great attention due to promising applications in optoelectronic devices [1][2][3][4][5][6][7

• to higher structures. This is due to missing synthetic strategies to incorporate suitable linkable functionalities into those luminophores. Our group is highly interested in the de novo synthesis of small organic luminophores and in this regard, we recently developed efficient methods for the

• synthesis of ESIPT-based luminophores [70][71][72]. Herein, we present the efficient functionalization of derivatives of the potent luminophores 1 and 2 with “clickable” azide functionalities to target the structures 3–5 and further investigated the influence of this functionalization, both in the unlinked

Emission solvatochromic, solid-state and aggregation-induced emissive α-pyrones and emission-tuneable 1H-pyridines by Michael addition–cyclocondensation sequences

• Natascha Breuer,
• Irina Gruber,
• Christoph Janiak and
• Thomas J. J. Müller

Beilstein J. Org. Chem. 2019, 15, 2684–2703, doi:10.3762/bjoc.15.262

• sensitive tunable luminophores and the observed aggregation-induced emission enhancement are currently under further investigation. Experimental Typical procedure for the cyclocondensation synthesis of compound 5d 1-Phenyl-3-[4-(trifluoromethyl)phenyl]prop-2-yn-1-one (3h, 1.40 g, 5.00 mmol), was placed in a

Efficient synthesis of pyrazolopyridines containing a chromane backbone through domino reaction

• Razieh Navari,
• Saeed Balalaie,
• Saber Mehrparvar,
• Fatemeh Darvish,
• Frank Rominger,
• Fatima Hamdan and
• Sattar Mirzaie

Beilstein J. Org. Chem. 2019, 15, 874–880, doi:10.3762/bjoc.15.85

• and luminophores in organic light emitting diodes [26][27]. The synthesis of pyrazolopyridines has been reported in several different multistep manners [28][29][30][31][32][33][34][35][36]. However, some of the reported methods have several limitations such as long reaction time, low yields, boring

Recent advances in materials for organic light emitting diodes

• Eli Zysman-Colman

Beilstein J. Org. Chem. 2018, 14, 1944–1945, doi:10.3762/bjoc.14.168

• to the University of St Andrews where he is presently Reader in Optoelectronic Materials and Fellow of the Royal Society of Chemistry. His research program focuses on the rational design of: (i) luminophores for use in organic light emitting diodes (OLEDs) and light-emitting electrochemical cells

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

• better to single-stranded T10 and double-stranded (dA)10-T10. Confocal microscopy Over the past years, there has been an increased interest in the development of luminescent probes for bioimaging. In that respect, both metal-containing [35] as well as organic [36] luminophores were examined. We found

• confirms stability of both luminophores in a complex cellular environment. Conclusion In conclusion, we report on four fluorescent pyrene–nucleobase (nucleobase = thymine, adenine) conjugates. Compounds 2 and 3 were obtained in reactions of 1-(3-chloropropionyl)pyrene with thymine and adenine, respectively

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

• in the vibrationally relaxed excited singlet state. Keywords: absorption; cycloaddition; diversity-oriented synthesis; fluorescence; heterocycles; imidation; Introduction Luminophores as functional π-electron systems [1] are crucial in modern illumination technologies, such as organic light

Synthesis of tetrasubstituted pyrazoles containing pyridinyl substituents

• Josef Jansa,
• Ramona Schmidt,
• Ashenafi Damtew Mamuye,
• Laura Castoldi,
• Alexander Roller,
• Vittorio Pace and
• Wolfgang Holzer

Beilstein J. Org. Chem. 2017, 13, 895–902, doi:10.3762/bjoc.13.90

• representatives. Moreover, tetrasubstituted pyrazoles have shown to act, for instance, as estrogen receptor antagonists [14][15], endothelin antagonists [16], lipoxygenase inhibitors [17] and special luminophores [18]. For such fully substituted pyrazoles different synthetic approaches have been published. The

Energy down converting organic fluorophore functionalized mesoporous silica hybrids for monolith-coated light emitting diodes

• Markus Börgardts and
• Thomas J. J. Müller

Beilstein J. Org. Chem. 2017, 13, 768–778, doi:10.3762/bjoc.13.76

• convert the emitted UV light into light with correlated color temperatures of very cold white (41100 K, 10700 K) as well as a greenish white emission with correlated color temperatures of about 5500 K. Keywords: benzofurazane; LED; luminophores; mesoporous silica hybrids; monoliths; Nile red; perylene

• (RGB) emitting phosphors generally relying on inorganic luminophores, such as rare earth metals as Ce3+ or Eu2+, are employed for white light generation [3][4][7]. However, the development of purely organic down converting phosphors would offer a sustainable and potentially cost-effective access

• alternative, eventually starting from renewable organic materials [8][9]. Other than inorganic luminophores these organic analogues cannot simply be intercalated in a robust inorganic host structure and, therefore, ligating materials are required. Since the host structure should not undergo photodegradation