Spectral properties of highly selective chemosensor for Hg2+.
A (E)-2-(2-(2-(1H-indol-3-yl)vinyl)-4H-chromen-4-ylidene)malononitrile (dye 1) was synthesized and its cation sensing properties in DMSO were investigated by UV-vis spectroscopy. Upon the addition of Hg2+, the solution of dye 1 showed color change and the absorption band shows a formation of a 1:1 dye 1-Hg2+ coordination complex. The dye 1 exhibited high selectivity for Hg2+ as compared with other cations. Interestingly, the dye 1-F- complex also could be recovered by adding Hg2+. We have investigated the ability of complex formation based on the association constant, Kass; the binding ability for the complex formation of dye 1-F- and Hg2+ is greater than that of the dye 1 with F-.
FITI Testing & Research Institute, Seoul 892-64, Republic of Korea.
Eun-Mi
EM
Lee
Department of Textile System Engineering, Kyungpook National University, Daegu 702-701, Republic of Korea.
Seon-Yeong
SY
Gwon
Department of Textile System Engineering, Kyungpook National University, Daegu 702-701, Republic of Korea. Electronic address: shokim@knu.ac.kr.
Sung-Hoon
SH
Kim
D000838:Anions / Q000737:chemistry; D002413:Cations, Divalent / Q000032:analysis; D003124:Colorimetry / Q000379:methods; D004396:Coloring Agents / Q000138:chemical synthesis / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry; D008628:Mercury / Q000032:analysis*; D009570:Nitriles / Q000138:chemical synthesis / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013053:Spectrophotometry / Q000379:methods; D014867:Water / Q000032:analysis
D000838:Anions; D002413:Cations, Divalent; D004396:Coloring Agents; D009570:Nitriles; D014867:Water; C000945:dicyanmethane; D008628:Mercury; D005459:Fluorides
Association constant; Chemosensor; Colorimetric; Fluoride ion; Hg(2+) cation sensing