Synthesis of novel AIEE active pyridopyrazines and their applications as chromogenic and fluorogenic probes for Hg2+ detection in aqueous media
作者： Shalu Gupta , Marilyn D. Milton
DOI: 10.1039/C7NJ04573E
关键词:
摘要: A series of novel pyridopyrazine derivatives was synthesized in excellent yields. All compounds displayed weak fluorescence emission solution but showed strong the aggregated state indicating aggregation induced enhancement (AIEE) characteristics. Single crystal analysis PP1 a highly twisted conformation with no π–π stacking interactions. The application these pyridoyrazines as chromogenic and fluorogenic probes for detection Hg2+ ions is also reported. Pyridopyrazine bearing electron-withdrawing biphenyl rings (PP1 PP2) act “turn-on” fluorescent while those electron-donating (PP3 PP4) “turn-off” non-buffered aqueous media high selectivity presence competitive metal such Na+, K+, Mg2+, Ca2+, Ba2+, Cr3+, Fe3+, Fe2+, Co2+, Ni2+, Cu2+, Ag+, Zn2+, Cd2+, Al3+ Pb2+. visual color change from colorless to yellow upon treatment observed all probes; thus, they could be used naked eye ions. These selective range 3.37 × 10−7 M 8.17 10−8 M. 1 : 1 binding stoichiometry complex formation between derivative confirmed by Job's plot NMR studies. Binding pyridopyrazines found reversible addition KI process repeated several times. Additionally, filter paper strips coated PP2 were
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