Huang Meng-Xia, Lv Cai-Hua, Huang Qing-Da, Lai Jia-Ping, Sun Hui
School of Chemistry & Environment, South China Normal University Guangzhou 510006 Guangdong China
College of Environmental Science & Engineering, Guangzhou University Guangzhou 510006 Guangdong China
RSC Adv. 2019 Nov 5;9(62):36011-36019. doi: 10.1039/c9ra06356k. eCollection 2019 Nov 4.
A novel, highly sensitive and fast responsive turn-on fluorescence probe, 2,2'-((1,1')-((1,10-phenanthroline-2,9-diyl)bis(methanylylidene)) bis(azanylylidene)) diphenol (ADMPA), for Cd was successfully developed based on 2,9-dimethyl-1,10-phenanthroline and -aminophenol. ADMPA showed a remarkable fluorescence enhancement toward Cd against other competing cations, owing to the suppression of the photo-induced electron transfer (PET) and CH[double bond, length as m-dash]N isomerization. A good linear relationship ( = 0.9960) was obtained between the emission intensity of ADMPA and the concentration of Cd (0.25-2.5 μM) with a detection limit of 29.3 nM, which was much lower than that reported in literature. The binding stoichiometry between ADMPA and Cd was 2 : 1 as confirmed by the Job's Plot method, which was further confirmed by a H NMR titration experiment. Moreover, the ADMPA probe was successfully applied to detect Cd in real water samples with a quick response time of only 6.6 s, which was about 3-40 times faster than the reported cadmium ion probe.
基于2,9-二甲基-1,10-菲啰啉和对氨基苯酚，成功开发了一种新型、高灵敏度且响应快速的开启型荧光探针2,2'-((1,1')-((1,10-菲啰啉-2,9-二基)双(亚甲基))双(亚氮基))二苯酚(ADMPA)用于检测镉。由于光诱导电子转移(PET)的抑制和C[双键，长度如m破折号]N异构化，ADMPA对镉表现出相对于其他竞争阳离子显著的荧光增强。ADMPA的发射强度与镉浓度(0.25 - 2.5 μM)之间获得了良好的线性关系( = 0.9960)，检测限为29.3 nM，远低于文献报道的值。通过Job's Plot法证实ADMPA与镉之间的结合化学计量比为2∶1，这通过1H NMR滴定实验进一步得到证实。此外，ADMPA探针成功应用于实际水样中镉的检测，响应时间仅为6.6 s，比报道的镉离子探针快约3 - 40倍。
