Highly selective and sensitive colourimetric detection of Hg2+ ions by unsymmetrical squaraine dyes

作者：Shafeekh K M; Rahim M K A; Basheer M C; Suresh C H; Das S^*

来源：Dyes and Pigments, 2013, 96(3): 714-721.

DOI：10.1016/j.dyepig.2012.11.013

• Mercury
• Squaraine dyes
• Organomercurials
• Fluorescence
• Near infrared
• TD-DFT

A novel class of sulphonate group containing unsymmetrical squaraine dyes has been synthesized. These dyes show a selective and sensitive affinity towards Hg2+ in methanol and are practically insensitive to most other environmentally and biologically relevant metal ions. Isothermal titration calorimetric (ITC) studies and High Resolution Mass Spectral (HRMS) analysis indicate a 1:1 binding mode. H-1 and C-13 NMR of the isolated Dye ... Hg2+ adduct showed an unusual addition reaction of Hg2+ along the phenyl-squarate carbon-carbon bond which was also supported by TD-DFT calculations using PM6 level geometries.

• 出版日期2013-3