Abstract
By combining a dithiolene metal binding moiety with coumarin as substituent and nickel as central metal a green complex was developed, which sensitively and selectively indicates the presence of Hg2+ ions in sample solutions by color degrading. Except with eyesight, this effect is also evidenced by UV–Vis spectroscopy in the biologically interesting NIR region, which is unaffected by absorptions of natural material. Other common metal ions as Cu2+, Zn2+, Fe3+ and many more do not interfere with the mercury ion detection. The indicator-complex is air and water stable and an easily applied, ready to use, low cost tool without any need for additional reagents, complicated technical procedures or laborious sample preparation.
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