A fluorescence zinc metal-organic framework for the effective detection of Fe3+ and Fe2+ in water

A fluorescence metal-organic framework [Zn-3(APT)(4)].2H(2)O (Zn-APT) was synthesized from Zn(NO3)(2).6H(2)O and 2-amino-6-purinethiol (ATP) by the solvothermal reaction. Zn-APT has a novel compact structure with a nbo topology type. The analyses of single-crystal diffraction reveal that Zn-APT crystallizes in a cubic crystal system and Fd3c space group. Based on a large amount of pi-conjugated organic ligands of ATP and d10 metal center of Zn2+, Zn-APT can emit strong luminescence. It can be used as a fluorescent probe to detect Fe3+ ion effectively. The detection limit is 0.28 mu M and K-sv (quenching efficiency) is 2.1 x 10(4) M-1. In addition, Zn-APT can adsorb hemoporphyrin dihydrochloride to produce a red-brown crystal Zn-APT-PH. Interestingly, it can also be used to detect Fe2+ ion efficiently with the detection limit of 0.12 mu M and K-sv of 1.9 x 10(4) M-1.