期刊
DALTON TRANSACTIONS
卷 50, 期 1, 页码 143-150出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0dt03626a
关键词
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资金
- National Natural Science Foundation of China [51672167]
- Fundamental Research Funds for the Central Universities [GK202003032]
- Science and Technology program of Xi'an [201805027YD5CG11(3)]
- National Undergraduate Innovation and entrepreneurship training program [201910708011]
This study investigated the ionothermal reactions of Eu3+ and Tb3+ with 4,4'-oxybisbenzoic acid, and their luminescent properties under different pH and water content. The emission colors and intensities of the produced compounds were analyzed for pH and water detection purposes.
The detection of pH and water is of significance in natural and production processes. The ionothermal reactions of 4,4'-oxybisbenzoic acid (H(2)OBA) with Eu3+ and Tb3+ produced [M(OBA)(H2O)Cl] (M = Eu3+ (1) and Tb3+ (2)) and heteronuclear [Eu0.05Tb0.95(OBA)(H2O)Cl] (3). 3 emits the combined characteristic transitions of Eu3+ and Tb3+. Its energy transition processes can be disturbed by pH and water. The emission colors of 3 follow pH changes. It emits blue light when pH = 1-2, in which OBA(2-) turns into H(2)OBA based on the acid-base equilibrium. When pH = 3-11, the emission colors change from green to orange and I-Tb/I-Eu exhibits a linearity of I-Tb/I-Eu = 6.7482-0.5971.pH; the emissions are quenched at pH = 12-13, due to OH- destroying the delocalized conjugated system of 3. 3 shows a fluorescence response to water with a linearity of I-Tb/I-Eu = 0.30353 + 0.15042 center dot VH2O% within 0-0.8% VH2O%. The green (G) and red (R) color intensities of the paper-based MOF sensor of 3 reveal a trinomial fitting equation of G/R = 4.16334 - 1.23014.pH + 0.14036.pH(2) - 0.00551.pH(3) when pH = 3-11. 3 can be used as a ratiometric fluorescent sensor to detect pH and water and the paper-based MOF sensor can also be used in on-site pH detection.
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