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Highly Selective Detection of 2,4,6‐Trinitrophenol and Cu 2+ Ions Based on a Fluorescent Cadmium–Pamoate Metal–Organic Framework
Author(s) -
Ye Junwei,
Zhao Limei,
Bogale Raji Feyisa,
Gao Yuan,
Wang Xiaoxiao,
Qian Xiaomin,
Guo Song,
Zhao Jianzhang,
Ning Guiling
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201405267
Subject(s) - nitrobenzene , fluorescence , chemistry , metal organic framework , selectivity , cadmium , metal ions in aqueous solution , metal , inorganic chemistry , photochemistry , organic chemistry , adsorption , catalysis , physics , quantum mechanics
Abstract A luminescent cadmium–pamoate metal–organic framework, [Cd 2 (PAM) 2 (dpe) 2 (H 2 O) 2 ]⋅0.5(dpe) ( 1 ), has been synthesized under hydrothermal conditions by using π‐electron‐rich ligands 4,4′‐methylenebis(3‐hydroxy‐2‐naphthalenecarboxylic acid) (H 2 PAM) and 1,2‐di(4‐pyridyl)ethylene (dpe). Its structure is composed of both mononuclear and dinuclear Cd II building units, which are linked by the PAM and dpe ligands, resulting in a (4,8)‐connected 3D framework. The π‐conjugated dpe guests are located in a 1D channel of 1 . The strong emission of 1 could be quenched efficiently by trace amounts of 2,4,6‐trinitrophenol (TNP), even in the presence of other competing analogues such as 4‐nitrophenol, 2,6‐dinitrotoluene, 2,4‐dinitrotoluene, nitrobenzene, 1,3‐dinitrobenzene, hydroquinone, dimethylbenzene, and bromobenzene. The high sensitivity and selectivity of the fluorescence response of 1 to TNP shows that this framework could be used as an excellent sensor for identifying and quantifying TNP. In the same manner, 1 also exhibits superior selectivity and sensitivity towards Cu 2+ compared with other metal ions such as Zn 2+ , Mn 2+ , Mg 2+ , K + , Na + , Ni 2+ , Co 2+ , and Ca 2+ . This is the first MOF that can serve as a dual functional fluorescent sensor for selectively detecting trace amounts of TNP and Cu 2+ .