Vanillinyl Schiff base (H2L), a nontoxic probe and a fluorescent sensor to Zn2+, LOD 0.018 μM is used for living cell imaging.
A water soluble non-fluorescent biofriendly cell permeable structurally characterised copper(ii) complex (1) selectively senses HSO4− ions as low as 3.18 × 10−7 M in water : DMSO (9 : 1, v/v) HEPES buffer at biological pH.