An Efficient Molecular Scaffold Exhibiting Fl

摘要

The present work describes design and synthesis of a biphenylaldimine derivative, probe 2 as an efficient molecular scaffold. The probe 2 showed good photophysical behavior and upon interaction with anions and gases showed high selectivity and sensitivity for CN- anion and HCN gas through a reaction based chemodosimeter approach with limit of detection 24 ppb and 7 ppm, respectively. The change in optical behavior of the probe is attributed to intramolecular charge transfer (ICT) mechanism. Probe 2 displayed enhanced emission, "turn-on" due to the formation of a new biphenyl oxazole derivative 4 in the medium along with change in color of the medium which was sensitive to the naked-eyes. The mechanism of interaction between probe and cyanide anion have been confirmed by the !1H NMR, ~(13)C NMR and HRMS spectral data analysis. The molecular probe 2 has been successfully utilized to detect cyanide (CN-) and HCN gas in solution and on test paper strips.