研究目的
To synthesize and study the self-assembly of zinc (2-diethoxyphosphorylethynyl)porphyrins through weak coordinative bonds, exploring their structural organization in solid state and solution, and investigating the influence of substituents on stability and properties.
研究成果
The research successfully synthesized novel zinc (2-diethoxyphosphorylethynyl)porphyrins and demonstrated their self-assembly into dimers and polymers via weak Zn-O(P) coordination bonds, without significant π-stacking. The stability of these assemblies is influenced by electronic effects of substituents, with electron-deficient porphyrins forming more stable dimers. This provides a foundation for designing supramolecular architectures based on M-O(P) coordination for applications in materials science.
研究不足
The study is limited to specific porphyrin derivatives and solvents (e.g., chloroform); not all compounds could be crystallized for X-ray analysis. The self-assembly stability is concentration and temperature dependent, and electronic effects dominate over steric effects in solution behavior.
1:Experimental Design and Method Selection:
The study involved Sonogashira cross-coupling reactions (both copper-cocatalyzed and copper-free) to synthesize porphyrin derivatives, followed by characterization using X-ray diffraction, NMR, UV-vis spectroscopy, and mass spectrometry to analyze self-assembly.
2:Sample Selection and Data Sources:
Bromoporphyrin precursors (e.g., Zn8a, Zn9a-c, Zn10a-c, Zn11) and diethyl ethynylphosphonate (7) were used as starting materials, synthesized or obtained commercially.
3:List of Experimental Equipment and Materials:
Equipment included NMR spectrometers (Bruker Avance III 500 MHz and 600 MHz), FTIR spectrophotometers (Nicolet Nexus and Bruker Vector 22), UV/Vis spectrophotometer (Varian Cary 5000), mass spectrometers (Bruker Ultraflex II LRF 2000 and Thermo LTQ Orbitrap XL), and X-ray diffractometer. Materials included silica gel for chromatography, solvents (toluene, chloroform, methanol, etc.), and catalysts (PdCl2(PPh3)2, PdCl2(dppf), CuI, Cs2CO3).
4:3). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Reactions were carried out in sealed tubes under N2 atmosphere, heated at specified temperatures, monitored by TLC, and purified by column chromatography. Crystals were grown by slow evaporation. Spectroscopic measurements were performed at various temperatures and concentrations.
5:Data Analysis Methods:
Data were analyzed using standard software for NMR, IR, UV-vis, and mass spectrometry. X-ray data were refined with appropriate programs.
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NMR Spectrometer
Avance III 500 MHz
Bruker
Acquiring 1H, 31P, and 13C NMR spectra for structural characterization
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NMR Spectrometer
Avance III Nanobay 600 MHz
Bruker
Acquiring high-resolution NMR spectra
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FTIR Spectrophotometer
Vector 22
Bruker
Recording FTIR spectra
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Mass Spectrometer
Ultraflex II LRF 2000
Bruker
Obtaining MALDI-TOF mass spectra
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Mass Spectrometer
LTQ Orbitrap XL
Thermo
High-resolution mass spectrometry with ESI source
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Silica Gel
60, 63-200 mm
Aldrich
Column chromatography purification
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FTIR Spectrophotometer
Nexus
Nicolet
Recording FTIR spectra of compounds
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UV/Vis Spectrophotometer
Cary 5000
Varian
Recording electronic absorption spectra
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X-ray Diffractometer
Single crystal X-ray diffraction analysis
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Carousel 12 Plus
Radleys
Parallel synthesis equipment for catalytic reactions
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