Selective detection and bio-imaging of Pd2+ with novel 'C-CN' bond cleavage of cyano-rhodamine, cyanation with diaminomaleonitrile

A new rhodamine based chemosensor, cyano-rhodamine, has been designed and synthesized with a green approach which shows a specific 'C-CN' bond breaking with the action of the Pd2+ ion to produce the specific color and fluorescence of rhodamine 6G itself in solution and in HeLa cells.