Optical properties and fluorescence quenching of biologically active ethyl 4-(4-N,N-dimethylamino phenyl)-2-methyl-5-oxo-4,5-dihydro-1H-indeno[1,2-b]pyridine-3-carboxylate (DDPC) dye as a probe to determine CMC of surfactants
作者:Salman A. Khan、Abdullah M. Asiri、Saad H. Al-Thaqafy
DOI:10.1039/c6ra02814d
日期:——
structure of the newly prepared DDPC. Electronic absorption and emission spectra of DDPC were measured in different solvents. The DDPC dye exhibits a red shift in its emission spectrum as the solvent polarity increases, indicating a large change in the dipole moment upon excitation due to intramolecular charge transfer within the excited DDPC molecules. Excited state intermolecular hydrogen bonding
4-(4- Ñ,Ñ二甲基氨基苯基)-2-甲基-5-氧代-4,5-二氢- 1 H ^ -茚并[1,2- b ]吡啶-3-羧酸乙酯(DDPC),制备经由所述茚满1,3-二酮与4-(二甲基氨基)苯甲醛,乙酰乙酸乙酯和乙酸铵的多组分反应。数据来自FT-IR,1 H-NMR,13C-NMR,EI-MS和元素分析与新制备的DDPC的化学结构一致。在不同的溶剂中测量了DDPC的电子吸收和发射光谱。随着溶剂极性的增加,DDPC染料的发射光谱呈现出红移,这表明由于激发的DDPC分子内的分子内电荷转移,激发后偶极矩发生了很大的变化。激发态的分子间氢键对DDPC分子的发射光谱能量和荧光量子产率有影响。DDPC染料可溶解成不同的胶束,可用作确定SDS和CTAB的临界胶束浓度(CMC)的探针。DDPC染料也可用于探测其局部微环境的极性和氢键性质。测试了DDPC的抗菌活性通过使用针对两种革兰氏阳性细菌和两种革兰氏阴性