Photophysical Investigation of a Benzimidazole Derivative and Its Applications in Selective Detection of Fe3+, Thermosensing and Logic Gates.The fluorescence based applications such as chemosensing of Fe3+ ion, temperature sensing, NOR-gate molecular logic operations, and fluorescent ink were achieved using an expired medicine namely Pantoprazole (sensor1) which is a derivative of benzimidazole class.  To confirm the selectiveness of sensor1, we performed interference experiments with other metal ions.  In thermal sensing application, the high value of activation energy i.e. 908 meV and relative sensitivity of 1.2% 0C-1 affirmed that sensor1 can be used for thermal applications. 
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