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Multifunctional Luminescent Eu(III)-Based Metal–Organic Framework for Sensing Methanol and Detection and Adsorption of Fe(III) Ions in Aqueous Solution

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posted on 2016-11-30, 14:05 authored by Jian Wang, Min Jiang, Ling Yan, Ren Peng, Mengjie Huangfu, Xinxin Guo, Yang Li, Pengyan Wu
A novel lanthanide–organic framework (Eu–HODA), consisting of 2,2′,3,3′-oxidiphthalic acids as efficient sensitizing units, is assembled and characterized. Eu–HODA features rare chiral helical channels despite the achiral nature of H4ODA. It is found that this MOF shows a unique luminescent response to methanol, in contrast to n-propanol and ethanol. Eu–HODA reveals a turn-off luminescence switching initiated by acetone molecules with an EC50 of 0.03 vol %, which is below the occupational exposure limit of acetone stipulated by the American Conference of Governmental Industrial Hygienists. Furthermore, it also exhibits high sensitivity (Stern–Volmer constant KSV = 2.09 × 104 L/mol) and low detection limit (6.4 ppb) for Fe3+ ions in pure water because of the existence of uncoordinated carboxyl groups within open frameworks. Eu–HODA-based test paper provides a simple and reliable detection method for Fe3+ in practical applications.