A colorimetric and ‘OFF–ON’ fluorometric chemosensor based on a rhodamine-pyrazole derivative for the detection of Al3+, Fe3+and Cr3+metal ions, and its intracellular application

( E )-2-(((5-chloro-3-methyl-1-phenyl-1 H -pyrazol-4-yl)methylene)amino)-3',6'-bis(diethylamino)spiro[isoindoline-1,9'-xanthen]-3-one.