Luminescence tuning of the Dy-Zn metal-organic framework and its application in the detection of Fe(III) ions

作者：Li, Yu-Fei; Wang, Dan; Liao, Zhuang; Kang, Yang; Ding, Wei-Hua; Zheng, Xiang-Jun^*; Jin, Lin-Pei

来源：Journal of Materials Chemistry C, 2016, 4(19): 4211-4217.

DOI：10.1039/c6tc00832a

• WHITE-LIGHT EMISSION
• 3 PRIMARY COLORS
• COORDINATION POLYMERS
• SITES
• EUROPIUM
• MOFS
• EU3+
• SEPARATION
• DIVERSITY
• COMPLEXES

A new Dy(III)-Zn(II) heterometallic-organic framework [H(H2O)(8)][DyZn4(imdc)(4)(im)(4)] (Dy-Zn MOF) (H(3)imdc = 4,5-imidazole dicarboxylic acid, im = imidazole) was synthesized under the hydrothermal conditions and characterized by single-crystal X-ray diffraction. The Dy-Zn MOF possesses the characteristic Dy(III) emission with a lifetime and a quantum yield of 54.65 mu s and 5.5%, respectively, when excited at 290 nm. The luminescence of the Dy-Zn MOF can be tuned by the excitation wavelength to give white-light and yellow emissions based on emissions of Dy3+ and the ligands imdc(3-) and im. The energy transfer pathways at different excitation wavelengths were discussed. Furthermore, the Dy-Zn MOF can act as a turn-off chemosensor for Fe3+ with high selectivity and sensitivity. The resultant species at different molar ratios of Dy-Zn MOF and Fe3+ in the response system were obtained and have the general formula [H(H2O)(8)][DyZn4-xFex(imdc)(4)(im)(4-x)(OH)(x)] with the same framework as the Dy-Zn MOF. The sensing mechanism could be described as the adsorption of Fe3+ and displacement of Zn2+ by paramagnetic Fe3+ in the Dy-Zn MOF to form the Dy-Zn-Fe MOF, resulting in fluorescence quenching. The quenching constant was determined to be 9.29 x 10(5) M-1.

• 出版日期2016
• 单位北京师范大学