| Abstrakt: |
A luminescent Eu(iii)-based coordination polymer, {[Eu(H2O)5(BTEC)][H(C5H6N2)]·3H2O} (1) has been synthesized under hydrothermal conditions using 1,2,4,5-benzenetetracarboxylic acid (H4BTEC) as a linker. Compound 1 possesses an anionic zig-zag chain constructed from the BTEC ligands and [EuO4(H2O)5] nodes. The protonated 4-aminopyridine groups as guests are located between chains. 1 exhibits the characteristic sharp emission bands of Eu3+ at 578, 593, 615, 652 and 693 nm upon excitation at 290 nm. The strong emission of 1 could be quenched effectively by trace amounts of Fe3+ ions even in the presence of other metal ions including Al3+, Ca2+, Cd2+, Co2+, Cr3+, Cu2+, Fe2+, K+, Mg2+, Mn2+, Pd2+ and Zn2+. Similarly, 1 also exhibits superior selectivity and sensitivity towards 4-nitrophenol (4-NP) compared with other competing interfering analytes, such as 2,4,6-trinitrophenol, 2,6-dinitrotolune, 4-nitrotoluene, nitrobenzene, 1,3-dinitrobenzene, o-xylene, nitromethane, nitropropane, phenol, 4-bromophenol and bromobenzene, through a fluorescence quenching mechanism. The possible fluorescence quenching mechanisms are discussed. Moreover, 1 could be used as a visual fluorescent test paper for selectively detecting trace amounts of Fe3+ and 4-NP. [ABSTRACT FROM AUTHOR] |
