A hydrazone-based spectroscopic off-on probe for sensing of basic arginine and lysine.

A simple probe BHN based on naphthol and benzothiazole is reported for detecting of arginine (Arg) and lysine (Lys) with high selectivity and sensitivity. The BHN in aqueous solution upon reacting with Arg or Lys induced a visible color change from colorless to yellow. The probe BHN can also be employed for fluorescence turn-on sensing of Arg and Lys with the limits of detection (LOD) of 5.

Selective sensing of PPi by fluorogenic Al(III)-probe complex in aqueous medium.

A newly designed Schiff base probe JN has been synthesized. It is highly selective and sensitive towards Al in nearly 100% aqueous medium by exhibiting a dramatic "turn-on" fluorescence response at 495 nm (λ = 450 nm). The sensing mechanism of JN towards Al ions was proposed as the combination of PET, ICT, ESIPT, and CHEF processes according to spectra studies and theory calculations.