478525-45-0Relevant academic research and scientific papers
VOLTAGE SENSITIVE DYES
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Page/Page column 66; 67, (2018/12/13)
Voltage sensitive dyes comprising boron and related compositions and methods are provided. In some embodiments, a voltage sensitive dye comprises an electron acceptor comprising boron. The electron acceptor may be attached (e.g., covalently) to at least one electron donating group and at least one polar group. For instance, the electron acceptor may comprise optionally substituted boron dipyrromethene (e.g., optionally substituted 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene). The point of attachment and chemical nature of the electron donating group(s) and polar group(s) may be selected to impart beneficial properties to the voltage sensitive dye. For instance, the voltage sensitive dye may have an extended difference in the dipole moment between the ground and electronic states due at least in part to the position of the electron donating group(s). The voltage sensitive dyes, described herein, may have high specificity, high signal to noise ratio, fast responsivity, high voltage sensitivity, high photostability, and/or high brightness.
Analogs of Michler's ketone for two-photon absorption initiation of polymerization in the near infrared: Synthesis and photophysical properties
Lemercier, Gilles,Martineau, Cecile,Mulatier, Jean-Christophe,Wang, Irene,Stephan, Olivier,Baldeck, Patrice,Andraud, Chantal
, p. 1606 - 1613 (2007/10/03)
We present the synthesis of substituted ketones, conjugated analogs of Michler's ketone. These molecules exhibit broadband TPA properties between 700 and 1100 nm due to a charge transfer from the terminal amino groups to the central ketone function and wi
New 4,4′-oligophenylenevinylene functionalized-[2,2′] -bipyridyl chromophores: Synthesis, optical and thermal properties
Viau, Lydie,Maury, Olivier,Le Bozec, Hubert
, p. 125 - 128 (2007/10/03)
The synthesis and characterization of new bipyridyl-based chromophores featuring extended oligophenylenevinylene π-conjugated backbones are reported. Their absorption and emission properties as well as their thermal stabilities are discussed in comparison
Unconventional Langmuir-Blodgett films: Alignment of an optically nonlinear dye where the donor and π-electron bridge are hydrophobic and the acceptor is hydrophilic
Ashwell, Geoffrey J.,Maxwell, Alison A.,Green, Andrew
, p. 2192 - 2196 (2007/10/03)
The optically nonlinear dye, 5-{4-[2-(4-dibutylaminophenyl)vinyl]benzylidene}-2-(1-ethylpropyl)-5,6,7, 8-tetrahydroisoquinolinium bromide (1a), differs from other Langmuir-Blodgett (LB) film-forming materials. The molecule is amphiphilic and, therefore, may be aligned at the air-water interface but, instead of a conventional aliphatic tail, has an extended π-electron bridge. It forms non-centrosymmetric LB films which exhibit second-harmonic generation (SHG) and have a high second-order susceptibility: χ(2)zzz = 40 pm V-1 at 1.064 μm for a monolayer thickness of 1.8 nm and chromophore tilt angle of 55° from the substrate normal. The octadecyl sulfate salt (1b) also forms non-centrosymmetric films but with improved properties: χ(2)zzz = 90 pm V-1 at 1.064 μm for d = 2.4 nm and φ = 33°. Both films exhibit charge-transfer bands at 360 nm but with absorbance cut-off above 560 nm for 1a and 530 nm for 1b. The latter is fully transparent at the fundamental and harmonic wavelengths and its susceptibility is the highest to date for such a film. This results from an optimised packing arrangement, a conjugation enhanced molecular hyperpolarisability of β = 4.3 × 10-38 m4 V-1, and the proximity of the absorption band, albeit non-overlapping at 532 nm. The properties are compared with those of conventional long alkyl tailed materials (2 and 3) of the same chromophore.
