727375-48-6Relevant articles and documents
Fluorescent probe, nerve agent detection element, preparation method and application
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Paragraph 0068; 0070-0072, (2021/02/10)
The invention relates to the technical field of fluorescent probes, and particularly discloses a fluorescent probe, a nerve agent detection element, a preparation method and application. The structureof the fluorescent probe is shown as a formula 3. Accor
Near infrared absorption/emission perylenebisimide fluorophores with geometry relaxation-induced large Stokes shift
He, Xifeng,Ma, Jie,Zhang, Hongbo,Zhang, Yizhi
, p. 35840 - 35847 (2020/10/27)
The dyes (P-1 and P-2) of perylenebisimide (PBI) conjugated with 2-(2-hydroxyphenyl)benzothiazole (HBT) were prepared by Sonogashira coupling reaction. The new compounds have special photophysical properties, such as near infrared absorption/emission and large Stokes shift. The UV-vis absorption (range from 651 nm to 690 nm) and emission wavelength (range from 732 nm to 756 nm) of P-1 and P-2 extend to near infrared range. Importantly, they have much larger Stokes shifts (range from 73 nm to 105 nm) compared with the conventional PBI derivatives, such as 7 (from 19 nm to 65 nm) and 9 (from 81 nm to 86 nm). TD-DFT calculation was used to rationalize UV-vis absorption, emission and especially large Stokes shift from the theoretical point of view. We found geometry relaxation of P-1 and P-2 in the excited state is an important reason for the origin of large Stokes shift besides intramolecular electron transfer (ICT).
Synthesis and acid-responsiveness of an insulated π-conjugated polymer containing spiropyrans in its backbone
Miyagishi, Hiromichi V.,Tamaki, Takashi,Masai, Hiroshi,Terao, Jun
supporting information, (2019/04/05)
A π-conjugated polymer containing spiropyrans (SPs), which could be almost completely converted to protonated merocyanines (MCH+) and back to the SP form by adding an acid and a base, respectively, was developed. The insulation of the π-conjugated polymer, referred to as insulated spiropyran-containing poly(p-phenylene ethynylene) (ins-SP-PPE), using permethylated α-cyclodextrins (PM α-CD) suppressed the π-π interaction between the polymer chains containing MCH+, and the installation of PM α-CD improved the switching ability of SPs. The polymer exhibited repeatable acidochromism with almost complete conversion between the SP and MCH+ forms. Photoluminescence measurements were conducted and the acid-induced luminescence quenching of the polymer in the solution was observed, which stemmed from energy transfer from the PPE to MCH+ moieties. In the solid state, the quantum yield of ins-SP-PPE was more than twice that of the uninsulated polymer, which derived from the insulation effects. The acid-induced luminescence quenching was also observed in the solid state.
