Comparison of 2-Arylnaphtho[2,3-<i>b</i>]phospholes and 2-Arylbenzo[<i>b</i>]phospholes: Effects of 2-Aryl Groups and Fused Arene Moieties on Their Optical and Photophysical Properties

Matano, Yoshihiro; Motegi, Yuta; Kawatsu, Shinsuke; Kimura, Yoshifumi

doi:10.1021/acs.joc.5b00541

Cited by 48 publications

(38 citation statements)

References 44 publications

(36 reference statements)

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“…The phosphindolium salts showed Φ F in the range from 70 % ( 2 h ) to 97 % ( 5 b ) [88 % ( 2 a ), 84 % ( 2 b ), 83 % ( 2 e ), 76 % ( 5 a ), 83 % on average]. The values are comparable to those reported for phosphindole oxide structures …”

Section: Methodssupporting

confidence: 68%

Direct Access to π‐Extended Phosphindolium Salts by Simple Proton‐Induced Cyclization of (o‐Alkynylphenyl)phosphanes

Arndt

Hansmann

Röminger

et al. 2017

Chemistry A European J

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A detailed synthetic and mechanistic study for the synthesis of phosphindolium salts from easy accessible (o-alkynylphenyl)phosphanes is reported. Mechanistic investigation indicates a fast protonation at phosphorus as evidenced by the isolation of the phosphonium intermediate, followed by a protophosphonylation reaction across the alkyne moiety. DFT calculations support our mechanistic proposal and indicate a reaction highly exergonic compared to our recently reported phosphinoauration. Photophysical measurements recorded fluorescence quantum yields up to 97 % in solution for the phosphindolium core and fluorescence was observed in the solid state.

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Section: Methodssupporting

confidence: 68%

Direct Access to π‐Extended Phosphindolium Salts by Simple Proton‐Induced Cyclization of (o‐Alkynylphenyl)phosphanes

Arndt

Hansmann

Röminger

et al. 2017

Chemistry A European J

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“…Third, upon increasing solvent polarity,t he emission maximum undergoes as ignificant bathochromic shift, with the color of the emitted light changing from bluish green to reddish orange.T aking advantage of these features,w er ecently developed the corresponding 3-phenyl-substituted derivative Ph-Bphox and demonstrated its application as ap olarity-sensitive probe. [13] These compounds were synthesized from the 3-bromo-substituted benzo-and naphthophosphole oxides 2a and 2b as key precursors, which were readily synthesized by the previously reported intramolecular trans-halophosphanylation of the corresponding phosphanylsubstituted diarylacetylenes (Scheme 1). In the course of this study anonbridged naphthophosphole derivative was reported by Matano and co-workers.…”

mentioning

confidence: 99%

A Phosphole Oxide Based Fluorescent Dye with Exceptional Resistance to Photobleaching: A Practical Tool for Continuous Imaging in STED Microscopy

et al. 2015

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“…In the course of this study anonbridged naphthophosphole derivative was reported by Matano and co-workers. [13] These compounds were synthesized from the 3-bromo-substituted benzo-and naphthophosphole oxides 2a and 2b as key precursors, which were readily synthesized by the previously reported intramolecular trans-halophosphanylation of the corresponding phosphanylsubstituted diarylacetylenes (Scheme 1). [14] Ther eduction of 2a and 2b with HSiCl 3 followed by halogen-lithium exchange with tBuLi produced the corresponding lithiated intermediates.…”

mentioning

confidence: 99%

A Phosphole Oxide Based Fluorescent Dye with Exceptional Resistance to Photobleaching: A Practical Tool for Continuous Imaging in STED Microscopy

et al. 2015

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The development of stimulated emission depletion (STED) microscopyr epresented am ajor breakthrough in cellular and molecular biology.H owever,t he intense laser beams required for both excitation and STED usually provoke rapid photobleaching of fluorescent molecular probes,w hich significantly limits the performance and practical utility of STED microscopy. We herein developed ap hotoresistant fluorescent dye C-Naphoxa sapractical tool for STED imaging.Withexcitation using either a l = 405 or 488 nm laser in protic solvents,C -Naphox exhibited an intense red/orange fluorescence (quantum yield F F > 0.7) with alarge Stokes shift (circa 5900 cm À1 ). Even after irradiation with aX elamp (300 W, l ex = 460 nm, full width at half maximum (FWHM) = 11 nm) for 12 hours,99.5 %ofC-Naphoxremained intact. The high photoresistance of C-Naphoxa llowed repeated STED imaging of HeLa cells.Even after recording 50 STED images, 83 %o fthe initial fluorescence intensity persisted.Super-resolution nanoscopic techniques,s uch as stimulated emission depletion (STED) microscopy,h ave evolved continuously over the past decade and have allowed scientists to visualize structural details in biological systems. [1][2][3][4][5][6][7][8][9] In STED imaging,afluorescent dye is exposed to irradiation from two different laser sources,namely an excitation laser and aSTED beam, where the STED beam is adonut-shaped beam for the depletion of excited molecules.T he spatial resolution of STED imaging increases with the I STED /I sat ratio,where I STED is the STED beam intensity and I sat represents the saturation intensity at 50 %depletion.[10] An increase of the I STED value, however, simultaneously accelerates the photobleaching of the dye,mainly through multiphoton absorption, [11] and even the most advanced photostable fluorophores currently available suffer from this limitation. Substantially enhancing the photostability of af luorescent dye has therefore been ap rimary concern in order to employ STED microscopy for live imaging.H erein, we report promising fluorescent small molecules which exhibit outstanding photostability,e ven in living cells and under continuous STED imaging conditions, relative to currently available photostable fluorophores.T his compound class is thus ap owerful tool for the advancement of STED microscopy,with potential applications,for instance, in repeated time-lapse STED imaging and live video imaging. Our molecular design was based on ac ore scaffold of (N,N-diphenylamino)phenyl-substituted benzophosphole Poxide (Bphox;F igure 1), [12] which offers several distinct advantages as af luorescent probe.F irst, the combination of the electron-donating properties of the amino moiety with the electron-accepting properties of the benzophosphole P-oxide leads to compounds with intense fluorescence emissions, which can retain high fluorescence quantum yields (F F )even in polar and protic solvents.S econd, this donor-acceptor combination gives rise to an intramolecular charge transfer (ICT) character of the excited s...

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Comparison of 2-Arylnaphtho[2,3-b]phospholes and 2-Arylbenzo[b]phospholes: Effects of 2-Aryl Groups and Fused Arene Moieties on Their Optical and Photophysical Properties

Cited by 48 publications

References 44 publications

Direct Access to π‐Extended Phosphindolium Salts by Simple Proton‐Induced Cyclization of (o‐Alkynylphenyl)phosphanes

Direct Access to π‐Extended Phosphindolium Salts by Simple Proton‐Induced Cyclization of (o‐Alkynylphenyl)phosphanes

A Phosphole Oxide Based Fluorescent Dye with Exceptional Resistance to Photobleaching: A Practical Tool for Continuous Imaging in STED Microscopy

A Phosphole Oxide Based Fluorescent Dye with Exceptional Resistance to Photobleaching: A Practical Tool for Continuous Imaging in STED Microscopy

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