Abstract
A squaraine based colorimetric probe 2,4-bis[4-(N,N-diisobutylamino)-2,6-dihydroxyphenyl]squaraine (IHSQ) was selected for colorimetric detection of Cu2+ and the characteristics of IHSQ for Cu2+ recognition were investigated by absorption spectra. The results showed the absorbance of IHSQ significantly decreased with increasing concentration of Cu2+ in acetonitrile/H2O (V/V = 9/1). This colorimetric detection method shows a satisfactory linear response (R2 = 0.9856) to Cu2+ concentration within the range from 2 μM to 200 μM. The limit of detection was 2 μM which was much lower than the environmental protection agency guideline of China (15.63 μM) in drinking water. Moreover, no obvious interference was observed on the detection of the Cu2+ in the presence of the common metal ions such as Zn2+, K+, Ca2+, Na+, Co2+, Ba2+, Cd2+, Cr3+, Sr2+, Pb2+ and Fe3+, indicating that IHSQ possesses high selectivity and satisfactory sensitivity for the detection of Cu2+.
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