研究目的
To design and synthesize BODIPY-incorporated metal-organic frameworks (SALI-MOFs) using the solvent-assisted ligand incorporation (SALI) approach and investigate their energy transfer, light-harvesting properties, and singlet oxygen generation ability.
研究成果
BODIPY-incorporated SALI-MOFs were successfully synthesized via the SALI approach, exhibiting efficient energy transfer from pyrene to BODIPY, enhanced light-harvesting properties, and improved singlet oxygen generation. SALI-I2BDP, with heavy iodine atoms, showed the highest singlet oxygen generation due to facilitated intersystem crossing. These MOFs have potential applications in photocatalysis, photovoltaics, and photodynamic therapy.
研究不足
The binding of BODIPY ligands to the Zr6 node was less than the maximum theoretical functionalization (4.0 per node) due to ligand solubility issues in the reaction medium. The singlet oxygen generation ability of SALI-BDP was not impressive despite efficient energy transfer, possibly due to the fast lifetime of the singlet excited state of BDP, which was addressed by introducing heavy atoms (iodine) in SALI-I2BDP.
1:Experimental Design and Method Selection:
The study employed the solvent-assisted ligand incorporation (SALI) approach to functionalize NU-1000 MOFs with BODIPY moieties. This involved post-synthetic modification to incorporate carboxylic acid-functionalized BODIPY ligands into the Zr6 nodes of NU-1000, maintaining the MOF topology. Theoretical models included energy transfer mechanisms between pyrene (donor) and BODIPY (acceptor) based on spectral overlap and proximity.
2:Sample Selection and Data Sources:
Samples included synthesized NU-1000, SALI-BDP, and SALI-I2BDP MOFs. Ligands such as BDP and I2BDP were synthesized following reported methods. Data sources included experimental measurements from characterization techniques.
3:List of Experimental Equipment and Materials:
Materials: Zirconyl chloride octahydrate, benzoic acid, N,N-dimethylformamide (DMF), triethylamine, dimethyl sulfoxide (DMSO), 2,3-Dichloro-5,6-dicyano-p-benzoquinone, 4-Formylbenzoic acid, N-iodosuccinimide, acetonitrile, 2,4-dimethylpyrrole, trifluoroacetic acid, boron trifluoride-ethyl ether complex, tetrakis(triphenylphosphine)palladium(0), tetrahydrofuran, chloroform, dichloromethane, methanol, dihydroxynaphthalene (DHN). Equipment: Powder X-ray diffractometer (Rigaku SmartLab), scanning electron microscope (JSM-7800F; JEOL), Fourier transform infrared spectrometer (Bruker VERTEX 80 V), NMR spectrometer (Agilent 400 MHz), surface area analyzer (Quantachrome Instruments), UV-Vis spectrophotometer (GENESYS 10S; Thermo Fisher Scientific), steady-state photoluminescence spectrophotometer (FluoroMate FS-2; SCINCO), time-resolved photoluminescence spectrophotometer (FluoTime 300; PicoQuant), halogen lamp (KL 1500; SCHOTT).
4:Experimental Procedures and Operational Workflow:
Synthesis of NU-1000 involved heating ZrOCl2·8H2O and benzoic acid in DMF, adding H4TBAPy ligand, sonicating, stirring, washing, acid treatment, and activation. SALI-MOFs synthesis involved adding activated NU-1000 to a solution of BODIPY ligands in MeCN:DMSO, heating, washing, and drying. Singlet oxygen generation tests involved adding MOFs to DHN solution, irradiating with a halogen lamp, and monitoring Juglone formation via UV-Vis spectroscopy. Characterization included PXRD, SEM, FT-IR, NMR, N2 adsorption, UV-Vis, and photoluminescence measurements.
5:Data Analysis Methods:
Data analysis included BET surface area calculation from N2 isotherms, pore size distribution using DFT method, spectral analysis for energy transfer (e.g., fluorescence quenching, lifetime measurements), and kinetic analysis of singlet oxygen generation from UV-Vis absorbance changes.
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Powder X-ray diffractometer
SmartLab
Rigaku
Characterization of crystalline properties of MOFs
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Scanning electron microscope
JSM-7800F
JEOL
Study of surface morphologies of MOFs
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Fourier transform infrared spectrometer
VERTEX 80 V
Bruker
FT-IR spectroscopy for chemical bonding analysis
VERTEX 80 & 80v FT-IR Spectrometers
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NMR spectrometer
400 MHz
Agilent
1H NMR analysis for ligand incorporation confirmation
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UV-Vis spectrophotometer
GENESYS 10S
Thermo Fisher Scientific
UV-Vis absorption spectra analysis
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Time-resolved photoluminescence spectrophotometer
FluoTime 300
PicoQuant
Time-resolved photoluminescence spectra measurement
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Halogen lamp
KL 1500
SCHOTT
UV-Vis light irradiation for singlet oxygen generation tests
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Surface area analyzer
Quantachrome Instruments
Measurement of N2 adsorption/desorption isotherms for surface area and porosity
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Steady-state photoluminescence spectrophotometer
FluoroMate FS-2
SCINCO
Steady-state photoluminescence spectra measurement
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