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A Selective Metal–Ligand Fluorescent Chemosensor for Dihydrogen Phosphate via Intermolecular Excimer Formation in Water
Author(s) -
Huang Xiaohuan,
He Yongbing,
Hu Chenguang,
Chen Zhihong
Publication year - 2009
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/ejoc.200801077
Subject(s) - chemistry , fluorescence , excimer , zinc , selectivity , ligand (biochemistry) , photochemistry , metal ions in aqueous solution , metal , inorganic chemistry , fluorescence spectroscopy , receptor , organic chemistry , catalysis , quantum mechanics , biochemistry , physics
Two new anthrylpolyamine ligands and their zinc complexes 1· 2Zn and 2· Zn have been synthesized. The recognition ability of 1· 2Zn and 2· Zn towards inorganic anions was studied by fluorescence spectroscopy in water at physiological pH values. The receptor 1· 2Zn displays an excellent selective fluorescent enhancement of the excimer emissive peak with H 2 PO 4 – that is absent with other inorganic anions such as SO 4 2– , NO 3 – , HCO 3 – , AcO – , F – , Cl – , Br – and I – . The obvious excimer formation can be explained by 2+2‐type binding between 1· 2Zn and H 2 PO 4 – , which was confirmed by electrospray ionization data. The sensitive fluorescent response and excellent selectivity show that receptor 1· 2Zn can be used as a fluorescent chemosensor for the H 2 PO 4 – anion under physiological pH conditions. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)