A Novel Multifunctional Near-Infrared Absorbing Dye for Hg²⁺ Recognition

Abstract:

A novel near-infrared absorbing colorimetric sensor with multifunctional groups, bis-dibenzo-18-crown-6 squaraine (BCSQ), has been identified and applied for accurate Hg²⁺ analysis based on the decrement of its UV absorbance (A) in the aqueous medium. The proposed method was successfully applied to analyse synthetic Hg²⁺ samples and natural Hg²⁺ samples. The results show that the linear range of Hg²⁺ detection in aqueous medium is 7.5~150×10⁸ mol·L¹ with a correlation coefficient (R) of 0.9983 and a limit of detection (3σ, n=20) of 5.6 ×10⁹ mol·L¹. The relative standard deviation (R.S.D.) for Hg²⁺ detection was lower than 2.4% (n=5). The proposed method possesses the advantages of simplicity, rapidity, high selectivity and sensitivity.

• Periodical: Applied Mechanics and Materials (Volume 320)
• Pages: 460-464
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.320.460
• Online since: May 2013
• Authors: Lei Hu, Ya Fei Zhang, Fang Kuo Wang, Zheng Quan Yan
• Keywords: Bis-dibenzo-18-crown-6 Squaraine, Hg²⁺, Near Infrared, Ratiometric Sensors, Recognition

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