Pyrimidine based highly sensitive fluorescent receptor for Al3+ showing dual signalling mechanism
作者:K. K. Upadhyay、Ajit Kumar
DOI:10.1039/c0ob00171f
日期:——
A new fluorescent probe (5-[(4-diethylamino-2-hydroxy-benzylidene)-amino]-1H-pyrimidine-2, 4-dione) (Receptor1) has been synthesized by the Schiff base condensation of 5-aminouracil with 4-(diethylamino)salicylaldehyde. The receptor 1 exhibits high selectively for Al3+ in DMSO as well as in aqueous solution even in the presence of biologically relevant cations such as Na+, K+, Ca2+, Mg2+, Pb2+ and several transition metal ions. The lowest detection limit for the receptor 1 was found to be 1.62 × 10−10 M with its linear response towards Al3+ in the concentration range of 1.75 × 10−9 to 3.3 × 10−8 M in DMSO. Receptor 1 is the first ever example where a single molecular probe is able to show imine (CN) isomerization inhibition along with twisted intramolecular charge transfer (TICT) in combinatorial fashion.
一种新的荧光探针(5-[(4-二乙基氨基-2-羟基-苄亚基)-氨基]-1H-嘧啶-2,4-二酮)(受体1)是通过5-氨基尿嘧啶与4-(二乙基氨基)水杨醛的席夫碱缩合反应合成的。受体1在二甲基亚砜(DMSO)和水中对Al3+具有高度选择性,即使在存在生物相关阳离子(如Na+、K+、Ca2+、Mg2+、Pb2+和几种过渡金属离子)的情况下也是如此。受体1的最低检测限为1.62×10-10M,在DMSO中浓度范围为1.75×10-9至3.3×10-8M时对Al3+呈线性响应。受体1是有史以来第一个能够以组合方式显示亚胺(CN