Design And Synthesis Of Dual-Emiitting Lanthanide MOFs And Temperatue Sensing

Temperature is probably the most fundamental parameter in all kinds of science, industrial production and daily life. Furthermore, the precise discrimination of the temperature of a living cell, especially that of a cancer cell, may contribute to advancements in cell biology and biomedicine.Traditional thermometers and thermocouple thermometer can’t be applied in some special conditions such as high-pressure, strong magnetic field, fast-moving objects, contactless measurement and cells. The luminescence-based temperature sensors have been attracted much attention, because it has advantages of high sensitivity, non-contact, rapid response, and it isn’t susceptible to electromagnetic interference. Compared with the thermometer based on only one transition, the ratiometric thermometers based on dual-emitting can reduce the impact of extrinsic factors from variation of the sensor concentration, size, local inhomogeneities and excitation power. In addition, the ratiometric thermometers has high sensitivity and can’t need additional calibration, so it has attracted much attention.As a new type luminescent material, luminescent MOFs has the rich luminescence centers, and bring convenience for designing a new type of temperature sensing material. We can design a new type MOFs thermometer with dual-emitting, based on the thermal coupling energy levels of rare earth ions (Dy3+, Er3+). On the other hand, we can make use of the isomorphism of lanthanide MOFs to develop a dual-emitting MOFs with two rare earth ions. In addition, the MOFs can be applied as the host material for encapsulating fluorescent dye molecules to exhibit dual emission of rare earth ions and fluorescent dye molecules.In the paper, Dycpia was be synthesized by using 5-(4-carboxyphenoxy)isophthalic acid (H3cpia), and the dual emission from the thermal coupling energy levels of Dy3+ was used to sensing temperature in 25-200℃.In the paper, [1,1’:4’,1"-terphenyl]-3,4",5-tricarboxylic acid (H3TPT) was used to synthesize a mixed lanthanide MOFs Eu0.0084Tb0.9916TPT, and it was applied in temperature in 10-225 K successfully, with high relative sensitivity.In the paper, we selected 4,5-di(4’- carboxylphenyl)phthalic acid (H4DCPPA) as a ligand to design a mixed lanthanide MOFs Tb0.824Eu0.176DCPPA, which exhibits the best temperature-dependent luminescent behavior in the physiological temperature range. Furthermore the color of Tb0.824Eu0.176DCPPA can change as the temperature changes and it has low biological toxicity, which might enable it to be applied in practical applications.In the paper, a new three-dimensional (3D) metal-organic framework ZJU-88 has been prepared based on [1,1’:4’,1":4",1’"-quaterphenyl]-3,3"1,5,5’"-tetracarboxylic acid (H4QPTCA). ZJU-88 was used to incorporate an organic dye perylene into porous to form the ZJU-88(?) perylene composite. We made use of the dual-emitting from organic dyes and lanthanide ions within ZJU-88(?) perylene to realize ratiometric temperature sensing with high relative sensitivity and low biological toxicity in physiological temperature range.