Department of Chemistry, University of Calicut, Malappuram, Kerala 673 635, India.
Department of Chemistry, University of Calicut, Malappuram, Kerala 673 635, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2019 Dec 5;223:117201. doi: 10.1016/j.saa.2019.117201. Epub 2019 May 27.
A hydrazine derived ESIPT active Schiff base, 1-(8-methanylylidene-7-hydroxy-4-methyl-2H-chromen-2-one)-2-(2, 4-dihydroxybenzylidene) hydrazine, L was synthesized and characterized by elemental analysis and by various spectroscopic techniques. L exhibited a colourimetric response towards Cu ion by changing from colorless to yellow with relatively a little or no interference of other common metal ions. The probe also showed good response for the detection of Cu in real water samples. The H-aggregated L displayed AIEE property in acetonitrile/water mixture. The restriction of molecular motions endued the luminogen with a yellow fluorescence through ESIPT emission at 562 nm having relatively large Stock's shift of 205 nm. The scanning electron microscopic study was carried out to investigate the morphology of the nanoaggregate. The aggregated luminogen displayed it yellow emission in the pH range of 4-7 without affecting the intensity. The applicability of the probe for the detection of picric acid was also checked.
一种由水合肼衍生的 ESIPT 活性席夫碱，1-(8-亚甲叉基-7-羟基-4-甲基-2H-色烯-2-酮)-2-(2,4-二羟基苯亚甲基)腙，L 通过元素分析和各种光谱技术进行了合成和表征。L 对 Cu 离子表现出比色响应，通过从无色变为黄色，相对较少或没有其他常见金属离子的干扰。探针还对实际水样中的 Cu 检测表现出良好的响应。在乙腈/水混合物中，聚集的 L 表现出 AIEE 性质。分子运动的限制通过 ESIPT 发射赋予发光体以 562nm 的黄色荧光，具有相对较大的 205nm 的斯托克斯位移。进行了扫描电子显微镜研究以研究纳米聚集体的形态。聚集的发光体在 pH 值为 4-7 的范围内显示黄色发射，而不会影响强度。还检查了探针对苦味酸检测的适用性。
