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A three-dimensional(3 D) metal-organic framework(MOF) ZnL·0.5 H_2O·0.75 DMF(H_2L=9-(pyridin-4-yl)-9 H-carbazole-3,6-dicarboxylic acid, DMF=N,N-dimethylformamide) has been synthesized under solvothermal condition. Crystal structure analysis shows that, in ZnL, each dinuclear Zn_2(COO)_2 unit is doubly-bridged to the other two by the carbazole moieties to form the 1 D chains, which are further connected together by pyridine moieties to lead to the 3 D framework. ZnL exhibits both high structural stability and good luminescent stability in water with the pH range of 4–10. ZnL displays the luminescent quenching response for Fe~(3+) in water with good linear correlation between the quenching efficiency and the concentration with K_(sv) of 10800 M~(-1) in the low concentration range of 0–0.1 mM. Interestingly, it is observed that the sensing performance for Fe~(3+) is stable in the pH range of 4–9, enabling ZnL to detect Fe~(3+) ions in weak acidic and weak basic solutions.
A Three-dimensional (3 D) metal-organic framework (MOF) ZnL · 0.5 H 2 O · 0.75 DMF (H 2 L = 9- (pyridin-4-yl) -9H- carbazole-3,6-dicarboxylic acid, DMF = N , N-dimethylformamide) has been synthesized under solvothermal conditions. Crystal structure analysis shows that, in ZnL, each dinuclear Zn_2 (COO) _2 unit is doubly-bridged to the other two by the carbazole moieties to form the 1 D chains, which are further connected together by pyridine moieties to lead to the 3 D framework. ZnL exhibits both luminescent stability stability in water with the pH range of 4-10. ZnL displays the luminescent quenching response for Fe ~ (3+) in water with good linear correlation between the quenching efficiency and the concentration with K_ (sv) of 10800 M -1 in the low concentration range of 0-0.1 mM. Interestingly, it is observed that the sensing performance for Fe ~ (3+ ) is stable in the pH range of 4-9, enabling ZnL to detect Fe ~ (3+) ions in weak acidic and weak basic solutions.