Five isostructural lanthanide metal–organic frameworks [Ln(BDPO)(H_(2)O)_(4)] (Ln = Eu for CUST-623, Tb for CUST-624, Gd for CUST-625, Dy for CUST-626, and Sm for CUST-627, BDPO = N,N'-bis(3,5-dicarboxyphenyl)-ox...Five isostructural lanthanide metal–organic frameworks [Ln(BDPO)(H_(2)O)_(4)] (Ln = Eu for CUST-623, Tb for CUST-624, Gd for CUST-625, Dy for CUST-626, and Sm for CUST-627, BDPO = N,N'-bis(3,5-dicarboxyphenyl)-oxalamide) were synthesized by the solvothermal method. Single-crystal X-ray diffraction shows that Ln-MOFs manifest framework structures with two kinds of 1D open channels in the b-axis direction. Dual emission luminescent thermometer films were successfully prepared by immobilizing Eu_(x)Tb_(0.02−x)-BDPO into polyvinyl alcohol (PVA) aqueous solution, which features the integrity of MOF powders, proving their excellent processability. Moreover, Eu0.002Tb0.018-BDPO@PVA shows excellent temperature sensing performance with a high sensitivity of 3.7% K^(−1) in the temperature range of 303 K–423 K. CUST-623 and CUST-624 can be used as multiresponse fluorescent sensors for detecting Fe^(3+), Cr_(2)O_(7)^(2−), CrO_(4)^(2−) and TNP. In addition, the mechanism of fluorescence sensing is investigated by infrared (IR) spectroscopy, powder X-ray diffraction (PXRD) and ultraviolet–visible (UV-vis) spectroscopy. This work provides a general method for constructing Ln-MOF sensor materials with multifunctional luminescence characteristics.展开更多
基金supported by the Joint Fund Project of the Natural Science Foundation of Jilin Province(YDZJ202101ZYTS052)the Open Project Program of Key Laboratory of Preparation and Application of Environmental Friendly Materials(Jilin Normal University)+1 种基金Ministry of Education,China(No.2021008)the Foundation of Changchun University of Science and Technology(XQNJJ-2019-12 and XJJLG-2019-03).
文摘Five isostructural lanthanide metal–organic frameworks [Ln(BDPO)(H_(2)O)_(4)] (Ln = Eu for CUST-623, Tb for CUST-624, Gd for CUST-625, Dy for CUST-626, and Sm for CUST-627, BDPO = N,N'-bis(3,5-dicarboxyphenyl)-oxalamide) were synthesized by the solvothermal method. Single-crystal X-ray diffraction shows that Ln-MOFs manifest framework structures with two kinds of 1D open channels in the b-axis direction. Dual emission luminescent thermometer films were successfully prepared by immobilizing Eu_(x)Tb_(0.02−x)-BDPO into polyvinyl alcohol (PVA) aqueous solution, which features the integrity of MOF powders, proving their excellent processability. Moreover, Eu0.002Tb0.018-BDPO@PVA shows excellent temperature sensing performance with a high sensitivity of 3.7% K^(−1) in the temperature range of 303 K–423 K. CUST-623 and CUST-624 can be used as multiresponse fluorescent sensors for detecting Fe^(3+), Cr_(2)O_(7)^(2−), CrO_(4)^(2−) and TNP. In addition, the mechanism of fluorescence sensing is investigated by infrared (IR) spectroscopy, powder X-ray diffraction (PXRD) and ultraviolet–visible (UV-vis) spectroscopy. This work provides a general method for constructing Ln-MOF sensor materials with multifunctional luminescence characteristics.
