Excessive concentration of Zn in the environment may lead to bad toxicological responses that can affect human health and create numerous challenges in the environment. Therefore, it is essential to develop a sensitive method such as selective chemosensors based on fluorescence properties, which does not require laborious work in order to detect Zn metal ion. A formylchromone-thiosemicarbazide with two chloro derivatives namely, DFCTSC was synthesised from reflux reaction of 6,8-dichloroformylchromone (DCFC) and thiosemicarbazide (TSC) in ethanol. The characterisation of the ligand structure was determined by using spectroscopic techniques such as Ultraviolet-Visible spectroscopy (UV-Vis), Fourier Transform Infrared spectroscopy (FT-IR) and Nuclear Magnetic Resonance spectroscopy (NMR). Meanwhile, the fluorescence property of DFCTSC in the presence of Zn2+ ion was recorded using a fluorescence spectrophotometer. The result showed DFCTSC has a good fluorescence behaviour towards Zn2+ io.....

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