研究目的
To synthesize new cooligomers containing both 2,5-silolene and germylene groups and characterize their photoelectronic and thermal properties.
研究成果
The synthesized cooligomers 6a-6d exhibit characteristic photoelectronic properties with strong absorption, excitation, and fluorescence emissions attributed to the chromophores in the repeating units. They are thermally stable up to 150°C and show potential for use in electronic materials, but further optimization is needed for higher molecular weights and improved stability.
研究不足
The cooligomers have low molecular weights and polydispersities, indicating oligomeric nature due to low reactivity and steric congestion, which may limit their application in high-performance materials. Thermal stability is moderate, with significant weight loss above 200°C.
1：Experimental Design and Method Selection:
The synthesis involved cooligomerization of 1,1-diethyl- or diisopropyl-2,5-dibromo-3,4-diphenyl-siloles with dichloro-disubstituted-germanes using n-BuLi, following a method similar to previous reports.
2：Sample Selection and Data Sources:
Compounds 3a and 3b were prepared via two-step reactions from dichlorodiethyl- and -diisopropyl-silanes, and cooligomers 6a-6d were synthesized from these.
3：List of Experimental Equipment and Materials:
Equipment included NMR spectrophotometer, FT-IR spectrophotometer, GPC system, UV-Vis spectrophotometer, fluorescence spectrophotometer, and TGA system. Materials included THF, n-BuLi, dichlorodisubstituted-germanes, etc.
4：Experimental Procedures and Operational Workflow:
Synthesis steps involved reactions at low temperatures, purification by precipitation and washing, and characterization using spectroscopic and thermal analysis techniques.
5：Data Analysis Methods:
Spectral data were analyzed for structural confirmation, and properties like molecular weight, absorption, excitation, fluorescence, and thermal stability were measured and interpreted.
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