Banerjee Mahuya, Ta Sabyasachi, Ghosh Milan, Ghosh Avijit, Das Debasis
Department of Chemistry, The University of Burdwan, Burdwan 713104, West Bengal, India.
Department of Chemistry, University of Calcutta, Kolkata 700009, West Bengal, India.
ACS Omega. 2019 Jun 21;4(6):10877-10890. doi: 10.1021/acsomega.9b00377. eCollection 2019 Jun 30.
An amide-based smart probe (L) is explored for nanomolar detection of Mo(VI) ion in a ratiometric manner, involving hydrogen-bond-assisted chelation-enhanced fluorescence process through inhibition of photoinduced electron transfer process. The recognition of Mo(VI) is associated with a 17-fold fluorescence enhancement and confirmed by single-crystal X-ray diffraction of the resulting Mo(VI) complex (M1). Further, M1 selectively recognizes arsenite through green emission of their adduct (C1) with an 81-fold fluorescence enhancement. Interestingly, dihydrogen phosphate causes dissociation of C1 back to free L having weak fluorescence. The methods are fast, highly selective, and allow their bare eye visualization at physiological pH. All of the interactions have been substantiated by time-dependent density functional theory calculations to rationalize their spectroscopic properties. The corresponding lowest detection limits are 1.5 × 10 M for Mo(VI), 1.2 × 10 M for AsO , and 3.2 × 10 M for HPO , whereas the respective association constants are 4.21 × 10 M for Mo(VI), 6.49 × 10 M for AsO , and 2.11 × 10 M for HPO . The L is useful for efficient enrichment of Mo(VI) from aqueous solution, while M1 efficiently removes AsO from environmental samples by solid-phase extraction.
探索了一种基于酰胺的智能探针（L），用于以比率法对钼（VI）离子进行纳摩尔检测，该过程涉及通过抑制光致电子转移过程的氢键辅助螯合增强荧光过程。对钼（VI）的识别伴随着17倍的荧光增强，并通过所得钼（VI）配合物（M1）的单晶X射线衍射得到证实。此外，M1通过其加合物（C1）的绿色发射选择性地识别亚砷酸盐，荧光增强81倍。有趣的是，磷酸二氢根会使C1解离回具有弱荧光的游离L。这些方法快速、高度选择性，并且在生理pH值下可裸眼观察。所有相互作用均已通过含时密度泛函理论计算得到证实，以合理化其光谱性质。钼（VI）的相应最低检测限为1.5×10⁻⁸ M，亚砷酸根为1.2×10⁻⁸ M，磷酸二氢根为3.2×10⁻⁸ M，而各自的缔合常数分别为钼（VI）4.21×10⁸ M，亚砷酸根6.49×10⁸ M，磷酸二氢根2.11×10⁸ M。L可用于从水溶液中高效富集钼（VI），而M1可通过固相萃取从环境样品中有效去除亚砷酸根。
