JOURNAL ARTICLE

A ratiometric chemosensor for fluorescent determination of Hg(2+) based on a new porphyrin-quinoline dyad

Zhi-Xiang Han, Hong-Yuan Luo, Xiao-Bing Zhang, Rong-Mei Kong, Guo-Li Shen, Ru-Qin Yu
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy 2009, 72 (5): 1084-8
19233718
Quinolin-8-ol p-[10',15',20'-triphenyl-5'-porphyrinyl]benzoate (1) was synthesized for the first time and developed as a ratiometric fluorescent chemosensor for recognition of Hg(2+) ions in aqueous ethanol with high selectivity. The 1-Hg(2+) complexation quenches the fluorescence of porphyrin at 646nm and induces a new fluorescent enhancement at 603nm. The fluorescent response of 1 towards Hg(2+) seems to be caused by the binding of Hg(2+) ion with the quinoline moiety, which was confirmed by the absorption spectra and (1)H NMR spectrum. The fluorescence response fits a Hill coefficient of 1 (1.0308), indicating the formation of a 1:1 stoichiometry for the 1-Hg(2+) complex. The analytical performance characteristics of the chemosensor were investigated. The sensor shows a linear response toward Hg(2+) in the concentration range of 3x10(-7) to 2x10(-5)M with a limit of detection of 2.2x10(-8)M. Chemosensor 1 shows excellent selectivity to Hg(2+) over transition metal cations except Cu(2+), which quenches the fluorescence of 1 to some extent when it exists at equal molar concentration. Moreover, the chemosensor are pH-independent in 5.0-9.0 and show excellent selectivity for Hg(2+) over transition metal cations.

Full Text Links

Find Full Text Links for this Article

Discussion

You are not logged in. Sign Up or Log In to join the discussion.

Related Papers

Remove bar
Read by QxMD icon Read
19233718
×

Save your favorite articles in one place with a free QxMD account.

×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"