Herein, a diamino functionalized highly fluorescent Hf-UiO-66 MOF (UiO stands for University of Oslo) is presented as an excellent free chlorine sensor in aqueous medium by quenching its strong blue emission. The compound retains its specificity towards free chlorine in the co-existence of possible cations and anions present in the aqueous medium. The material is stable enough in different solvents and different pH media (pH= 2-12). It can be recycled for several times for sensing purpose. The MOF compound maintains its structural robustness after detection experiment. The detection limit (0.02 μM) towards free chlorine is significantly lesser than the widely applied N-N-diethyl-p-phenylenediamine (DPD) in colorimetric technique. Furthermore, the material can successfully detect free chlorine form tap and swimming pool water samples. For on-site detection of free chlorine, MOF-coated paper strip device is also developed. The hydrogen bonding interaction with amino functionality and ClO^- moiety and energy transfer through N−H···O−Cl bond are the main reasons behind the quenching of emission signal of the material in presence of free chlorine. Hence, the compound is a superb probe for fast, specific, sensitive and recyclable recognition of free chlorine.

在本文中，通过淬灭其强烈的蓝色发射，提出了一种二氨基官能化的高荧光Hf-UiO-66 MOF（UiO代表奥斯陆大学）作为水性介质中优异的游离氯传感器。在水性介质中可能存在的阳离子和阴离子并存的情况下，该化合物保留了其对游离氯的特异性。该材料在不同溶剂和不同pH介质（pH = 2-12）中足够稳定。为了感测目的，它可以被回收多次。检测实验后，MOF化合物保持其结构坚固性。比色法中对游离氯的检出限（0.02μM）明显小于广泛使用的NN-二乙基-对苯二胺（DPD）。此外，该材料可以成功地检测自来水和游泳池水样本中的游离氯。为了现场检测游离氯，还开发了MOF涂层纸带装置。氢键与氨基官能团和ClO的相互作用^-通过NH····O-Cl键进行部分和能量转移是在存在游离氯的情况下材料发射信号猝灭的主要原因。因此，该化合物是用于快速，特异性，灵敏和可回收识别游离氯的极佳探针。