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首页> 外文期刊>Chemistry: A European journal >Simple bisthiocarbonohydrazones as sensitive, selective, colorimetric, and switch-on fluorescent chemosensors for fluoride anions
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Simple bisthiocarbonohydrazones as sensitive, selective, colorimetric, and switch-on fluorescent chemosensors for fluoride anions

机译：简单的双硫代碳hydr用作氟离子的灵敏，选择性，比色和开启式荧光化学传感器

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摘要

Bisthiocarbonohydrazones are found to be a class of sensitive, selective, ratiometric, and colorimetric chemosensors for anions such as fluoride (F-) or acetate (Ac-). The sensitivities, or the binding constants of the sensors with anions, were found to be strongly dependent on the substituents appended on the pi-conjugation framework, the delocalization bridge CH-N the aromatic moiety, and the hetero atom in the C=X group (X=O, S) of the sensors. Single-crystal structures and H-1 NMR titration analysis shows that the -CH=N- moiety is a hydrogen-bond donor, and it is proposed that an additional CH center dot center dot center dot F hydrogen bond is formed for the sensors in the presence F-. A sensor bearing anthracenyl groups is demonstrated as a switch-on fluorescent chemosensor for F- and Ac-. The recognition of F- in acetonitrile (MeCN) by a sensor with nitrophenyl substituents is tolerant to MeOH (MeCN/MeOH=10:1, v/v) and water (MeCN/H2O=30:1, v/v); at these solvent ratios the absorption intensity of the sensor-F- complex solution at maximal absorption wavelength was attenuated to half of the original value in pure MeCN.
机译：发现双硫代碳氢hydr酮是一类对阴离子（例如氟化物（F-）或乙酸盐（Ac-））敏感，选择性，比例式和比色的化学传感器。发现传感器的灵敏度或与阴离子的结合常数强烈取决于附加在pi共轭骨架上的取代基，离域桥CH-N，芳族部分和C = X基团中的杂原子（X = O，S）个传感器。单晶结构和H-1 NMR滴定分析表明-CH = N-部分是氢键供体，建议在传感器中形成一个额外的CH中心点中心点中心点F氢键在场F-。带有蒽基的传感器被证明是用于F-和Ac-的开启式荧光化学传感器。具有硝基苯基取代基的传感器对乙腈（MeCN）中F-的识别耐受MeOH（MeCN / MeOH = 10：1，v / v）和水（MeCN / H2O = 30：1，v / v）;在这些溶剂比率下，传感器-F-络合物溶液在最大吸收波长下的吸收强度被衰减至纯MeCN原始值的一半。

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