A novel indolium salt as a rapid colorimetric probe for cyanide detection in aqueous solution
作者:Dan Wen、Xuankai Deng、Yanhua Yu
DOI:10.1007/s11696-020-01371-3
日期:2021.3
probe shows high selectivity towards CN─ ions among tested anions. Addition of CN─ ions to probe IDTTH in semi-aqueous solution (acetonitrile/H2O = 1/1, V/V) could lead to a 195 nm blue shift of absorption band, together with colour changes from blue to yellow. The sensing mechanism is attributed to the nucleophilic addition between CN─ and the C=N bond of indolium group, which could be clearly clarified
本研究基于 6,6,12,12-四(4-己基苯基)-6,12-二氢二噻吩[2,3-d:2′,3 '-d']-s-indaceno[1,2-b:5,6-b']di-thiophene-2,8-dicarboxaldehyde-hemicyanine 共轭物已被开发出来。6,6,12,12-四(4-己基苯基)-6,12-二氢二噻吩[2,3-d:2',3'-d']-s-茚二烯[1,2-b: 5,6-b']二噻吩作为信号单元,半花青作为识别单元。该探针在被测阴离子中显示出对CN─离子的高选择性。在半水溶液(乙腈/H2O = 1/1,V/V)中加入CN─离子探测IDTTH可导致吸收带蓝移195 nm,同时颜色由蓝变黄。传感机制归因于CN─与吲哚基的C = N键之间的亲核加成,通过 1H NMR 滴定和 MS 光谱可以清楚地阐明这一点。此外,探针IDTTH可以作为低成本的试纸,方便肉眼检测CN─离子。