title: A colorimetric and turn-on fluorescent chemosensor for Al(III) based on a chromone Schiff-base.
abstract: A simple Schiff-base receptor 7-methoxychromone-3-carbaldehyde-(pyridylformyl) hydrazone (MCNH) was prepared. It exhibits an "off-on-type" mode with high sensitivity in the presence of Al(3+). This compound could be used as Al(3+) probe in ethanol and it features visible light excitation (433 nm) and emission (503 nm) profiles. Upon binding of Al(3+), a significant fluorescence enhancement with a turn-on ratio over 800-fold was triggered. However, other metal ions had no such significant effect on the fluorescence. MCNH can also be used as a colorimetric chemosensor for Al(3+), which is easily observed from colorless to yellow-green by the naked-eye. The detection limit of MCNH for Al(3+) was as low as 1.9×10(-7) M.
authors.affiliation: College of Chemistry and Chemical Engineering, State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, PR China.
authors.forename: Long
authors.initials: L
authors.lastname: Fan
authors.forename: Tian-rong
authors.initials: TR
authors.lastname: Li
authors.forename: Bao-dui
authors.initials: BD
authors.lastname: Wang
authors.forename: Zheng-yin
authors.initials: ZY
authors.lastname: Yang
authors.forename: Chun-jiao
authors.initials: CJ
authors.lastname: Liu
mesh_terms: D000535:Aluminum / Q000032:analysis*; D002412:Cations / Q000032:analysis; D003124:Colorimetry / Q000379:methods; D005456:Fluorescent Dyes / Q000737:chemistry*; D006835:Hydrazones / Q000737:chemistry*; D057230:Limit of Detection; D012545:Schiff Bases / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods
chemical_list: D002412:Cations; D005456:Fluorescent Dyes; D006835:Hydrazones; D012545:Schiff Bases; D000535:Aluminum
keywords: Aluminum ions; Chromone; Colorimetric; Detection limit; Fluorescence sensor; Reversibility