38486-12-3Relevant academic research and scientific papers
Photoactivatable aggregation-induced emission fluorophores with multiple-color fluorescence and wavelength-selective activation
Peng, Lu,Zheng, Yue,Wang, Xiaoyan,Tong, Aijun,Xiang, Yu
, p. 4326 - 4332 (2015)
Photoactivatable (caged) fluorophores are widely used in chemistry, materials, and biology. However, the development of such molecules exhibiting photoactivable solid-state fluorescence is still challenging due to the aggregation-caused quenching (ACQ) effect of most fluorophores in their aggregate or solid states. In this work, we developed caged salicylaldehyde hydrazone derivatives, which are of aggregation-induced emission (AIE) characteristics upon light irradiation, as efficient photoactivatable solid-state fluorophores. These compounds displayed multiple-color emissions and ratiometric (photochromic) fluorescence switches upon wavelength-selective photoactivation, and were successfully applied for photopatterning and photoactivatable cell imaging in a multiple-color and stepwise manner.
Synthesis of 2-Amino-4-(3-amino-5-hydroxy-4 H -pyrazol-4-ylidene)-4 H -chromene-3-carbonitriles
Mane, Mansing M.,Pore, Dattaprasad M.
supporting information, p. 1720 - 1724 (2016/07/06)
A simple and efficient protocol was developed for the synthesis of 2-amino-4-(3-amino-5-hydroxy-4H-pyrazol-4-ylidene)-4H-chromene-3-carbonitriles by the potassium phosphate-catalyzed reaction of salicylaldehydes, malononitrile, and 2-cyanoacetohydrazide in ethanol. The method offers advantages such as a simple workup procedure and good yields. When the method was extended to two equivalents of 2-cyanoacetohydrazide instead of malononitrile, the unexpected formation of a salicylaldehyde azine was observed, leading to a novel route for the synthesis of salicylaldehyde azines.
Novel de-acylative ring opening of 3-acetyl and 3-bromo acetyl coumarins
Yaragatti, Naazneen B.,Kulkarni, Manohar V.,Kumar, Gudibande N. A.,Gururow, Tayur N.
, p. 594 - 597,4 (2020/09/15)
Reaction of 3-acetyl and 3-bromoacetyl coumarins with hydrazine hydrate has resulted in the ring opening of the coumarin moiety. The reaction was attempted with a view to obtain some new pyridazinones and pyrazolones. The reaction did not proceed via the expected pathway instead led to the formation of salicyl azines, the structure of which has been confirmed by single crystal X-ray studies.
Salieylaldehyde azines as fluorophores of aggregation-induced emission enhancement characteristics
Tang, Weixin,Xiang, Yu,Tong, Aijun
experimental part, p. 2163 - 2166 (2009/08/07)
A series of salicylaldehyde azine derivatives were found to exhibit interesting aggregation-induced emission enhancement (AIEE) characteristics. In good solvent, all these compounds displayed very weak fluorescence, while strong emission was observed when they were placed in poor solvent. Moreover, the AIEE color of these compounds varied from green to red depending on the substituents on azines. Their in situ formation also promises potential applications in fluorescence sensing of hydrazine.
