1692-25-7Relevant articles and documents
A polyfluorene based zwitterionic fluorescent probe for response towards biological species in aqueous media
Chakraborty, Chanchal,Bera, Manas Kumar,Malik, Sudip
, p. 3522 - 3528 (2014)
Water soluble zwitterionic fluorescent conjugated boronic acid-bearing polyfluorene (PFBA) has been prepared from poly(9,9′-(6″-bromohexyl) fluorene-co-alt-1,4-phenylene) (polymer 3) through a post-polymerized quaternization with 3-pyridineboronic acid. Titration of diol containing monosaccharides (d-glucose and d-fructose), l-ascorbic acid and l-DOPA with PFBA polymer in 0.1 M phosphate buffer (pH 7.4) solution results in significant concentration dependent quenching of the blue fluorescence of the polymer due to static quenching as the bio-analytes form a ground state boronate ester complex with PFBA. Upon addition of d-glucose, the emission colour of PFBA changes to greenish-yellow owing to the effective induced aggregated polymer structure. PFBA also exhibits maximum response to the biological analytes at pH 7.4 which provides a scope for PFBA to be used in biological systems.
SYNTHESIS OF 5-(3-PYRIDYL)-2,2'-BITHIOPHENE(SENSITIZER)
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Page/Page column 10-11, (2021/02/05)
Disclosed herein is a novel simple, short process for synthesis of the photosensitizer, 5-(3-pyridyl)-2,2'-bithiophene.
New compounds and organic light-emitting diode including the same
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Paragraph 0200-0206; 0252; 0255-0258, (2019/08/30)
PURPOSE: A compound is provided to improve luminous efficiency and to make low voltage operation possible when applied to an organic electroluminescence device by having low driving voltage and excellent luminous efficiency. CONSTITUTION: A compound is represented by chemical formula 1. In chemical formula 1, each R is selected from hydrogen, deuterium, substituted or unsubstituted C1-6 alkyl, substituted or unsubstituted C7-30 alkyl, substituted or unsubstituted C3-30 cycloalkyl, substituted or unsubstituted C5-30 cycloalkenyl, substituted or unsubstituted C1-30 alkoxy, substituted or unsubstituted C6-30 aryloxy, substituted or unsubstituted C1-30 alkylthioxy, substituted or unsubstituted C5-30 arylthioxy, substituted or unsubstituted C1-30 alkylamine, substituted or unsubstituted C5-30 arylamine, substituted or unsubstituted C5-50 aryl, substituted or unsubstituted C3-50 heteroaryl, substituted or unsubstituted silicon, substituted or unsubstituted boron, substituted or unsubstituted silane, carbonyl, phosphoryl, amino, nitrile, hydroxy, nitro, halogen, amide, and ester.
Preparation method of mono-heterocyclic boric acid
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Paragraph 0050; 0052; 0067; 0069; 0071; 0073; 0075, (2018/09/13)
The invention provides a preparation method of mono-heterocyclic boric acid. The preparation method comprises steps as follows: (1) a compound shown in a formula I and alkyl borate are dissolved in asolvent A, and a liquor A is obtained; an organic lithium reagent is dissolved in a solvent B, and a liquor B is obtained; the liquor A and the liquor B are subjected to a continuous feeding reaction,the reaction is ended after a product flows out of a reaction pipe, and an intermediate is obtained; (2) the intermediate obtained in the step (1) is subjected to a hydrolysis reaction, and mono-heterocyclic boric acid is obtained. According to the provided preparation method, the reaction yield can be increased and can be up to 95% or above, the reaction time is shortened, the reaction can be completed within 5-60 min, the reaction temperature can be increased, energy consumption of the low-temperature reaction is reduced, the temperature is controllable, the safety is improved, the pressureis convenient to control, the automation degree is improved, production operation is facilitated, the cost is reduced, and the economic benefits are improved.