... 623-629 A novel coumarinyl scaffold as metal ion sensor towards spectrophotometric detection of Cu2+, Ni2+ and Zn2+ ion Pranabes Bhattacharyya, Arunima Medda, Dinesh C. Gorain, Bijon Kr. ... Amit Das, Anupal Chowdhury, Plaban Bhattacharya and Achintya Saha* ...