Highly selective 4-amino-1,8-naphthalimide based fluorescent photoinduced electron transfer (PET) chemosensors for Zn(<scp>ii</scp>) under physiological pH conditions
作者:Raman Parkesh、T. Clive Lee、Thorfinnur Gunnlaugsson
DOI:10.1039/b614529a
日期:——
The design and synthesis of two novel fluorescent sensors based on the photoinduced electron transfer (PET) concept, and , for the detection of zinc under competitive media is described. These sensors are based on the 4-amino-1,8-naphthalimide fluorophore, which has an absorption band centred at 450 nm and emits in the green with lambda(max) approximately 550 nm. By functionalizing the chromophore
描述和设计了两种基于光致电子转移(PET)概念的新型荧光传感器,并用于在竞争性介质下检测锌。这些传感器基于4-氨基-1,8-萘二甲酰亚胺荧光团,该团具有以450 nm为中心的吸收带,并以λ(max)大约550 nm的绿色发射。通过在4位上使用简单的基于苄基或乙基-芳基的亚氨基二乙酸酯受体对发色团进行功能化,可以实现对Zn(II)的竞争以及其他竞争性过渡以及I和II类金属离子的高选择性和灵敏性。这些传感器还显示出与pH无关,测定的pKa为2.3,这使得它们可以在竞争激烈的pH介质中使用。感测到Zn(II)后,荧光发射光谱为' “开启”表明PET从受体到荧光团的抑制。对于,在1.1 mM EGTA存在下,在pH 7.4缓冲溶液中测量时,Kd = 4 nM可以实现Zn(II)的检测。