The photophysical aspects of a synthesized coumarinyl chalcone derivative 3-((2E, 4E)-5-(4-(dimethylamino) phenyl) penta-2, 4-dienoyl)-4-hydroxy-2H-chromen-2-one (DPPHC) were explored. DPPHC shows excited state intramolecular proton transfer (ESIPT) suppressed excited state intramolecular charge transfer (ESICT) as evidenced from steady state and time resolved spectroscopic analysis. Interestingly, DPPHC behaves as a strong red emitter solely in chloroform and dichloromethane semi-polar solvents exclusively. Using this property, on-spot detection of these two solvents was achieved in paper strips coated with DPPHC as well as in spiked alcohol samples by emission ratiometry change.

合成香豆基查尔酮衍生物3-（（2E，4E）-5-（4-（二甲基氨基）苯基）penta-2，4-二烯丙基）-4-羟基-2H- chromen -2-one（DPPHC的光物理方面）进行了探索。从稳态和时间分辨光谱分析可以看出，DPPHC显示出激发态分子内质子转移（ESIPT）抑制了激发态分子内电荷转移（ESICT）。有趣的是，仅在氯仿和二氯甲烷半极性溶剂中，DPPHC才充当强红色发射体。利用此特性，可以通过排放比值变化在涂覆DPPHC的纸条以及加标酒精样品中实现对这两种溶剂的现场检测。