Khanra Somnath, Ta Sabyasachi, Ghosh Milan, Chatterjee Sudeshna, Das Debasis
Department of Chemistry, The University of Burdwan Golapbag Burdwan 713104 West Bengal India
RSC Adv. 2019 Jul 8;9(37):21302-21310. doi: 10.1039/c9ra03652k. eCollection 2019 Jul 5.
Excited-state intra-molecular proton transfer (ESIPT)-active imine and azine derivatives, structurally characterised by XRD, and denoted L1, L2, L3 and L4, possess weak fluorescence. The interaction of these probes with Zn turns ON the fluorescence to allow its nano-molar detection. Among the four ESIPT-active molecules, L2, L3 and L4 are bis-imine derivatives while L1 is a mono-imine derivative. Among the three bis-imine derivatives, one is symmetric (L3) while L2 and L4 are unsymmetrical. The lowest detection limits (DL) of L1, L2, L3 and L4 for Zn are 32.66 nM, 36.16 nM, 15.20 nM and 33.50 nM respectively. All the probes bind Zn (10 M order) strongly. Computational studies explore the orbital level interactions responsible for the associated photo-physical processes.
通过X射线衍射（XRD）进行结构表征并分别命名为L1、L2、L3和L4的激发态分子内质子转移（ESIPT）活性亚胺和嗪衍生物具有较弱的荧光。这些探针与锌的相互作用会开启荧光，从而实现纳摩尔级别的检测。在这四种ESIPT活性分子中，L2、L3和L4是双亚胺衍生物，而L1是单亚胺衍生物。在这三种双亚胺衍生物中，一种是对称的（L3），而L2和L4是不对称的。L1、L2、L3和L4对锌的最低检测限（DL）分别为32.66 nM、36.16 nM、15.20 nM和33.50 nM。所有探针都能与锌（10⁻⁶ M量级）强烈结合。计算研究探索了导致相关光物理过程的轨道能级相互作用。
