引用本文:
高健, 钟顺和. 负载型双烷氧基桥联双核铜(Ⅱ)配合物催化剂的合成、表征及催化反应性能[J]. 应用化学,
2000, 17(4): 392-396.
Citation: GAO Jian, ZHONG Shun-He. Supportedμ-dialkoxo Bridged Dicopper(Ⅱ) Complex Catalysts: Synthesis, Characterization and Catalytic Reactivity[J]. Chinese Journal of Applied Chemistry, 2000, 17(4): 392-396.
Citation: GAO Jian, ZHONG Shun-He. Supportedμ-dialkoxo Bridged Dicopper(Ⅱ) Complex Catalysts: Synthesis, Characterization and Catalytic Reactivity[J]. Chinese Journal of Applied Chemistry, 2000, 17(4): 392-396.
负载型双烷氧基桥联双核铜(Ⅱ)配合物催化剂的合成、表征及催化反应性能
摘要:
采用表面改性和金属嫁接相结合的方法,合成了SiO2负载的以_-dialkoxo为桥基配体的双核铜(Ⅱ)配合物催化剂Cu2(OEt)2/SiO2.络合滴定和红外光谱分析表明,铜(Ⅱ)离子在改性后的SiO2表面上以双齿配位形式键合.样品的磁矩测定结果表明,表面铜(Ⅱ)离子间存在着强的反铁磁自旋超交换作用,进一步证实表面桥联结构的存在.运用红外分子探针技术,研究了该催化剂对CO2和EO(环氧乙烷)的化学吸附特性.研究结果表明,两种分子在催化剂表面路易斯酸和路易斯碱中心的协同作用下形成桥式吸附态.在该催化剂的作用下,CO2与EO可在100~120℃催化反应生成碳酸乙烯酯.
English
Supportedμ-dialkoxo Bridged Dicopper(Ⅱ) Complex Catalysts: Synthesis, Characterization and Catalytic Reactivity
Abstract:
A silica supportedμ-dialkoxo bridged dicopper(Ⅱ) complex catalyst Cu2(OEt)2/SiO2 was synthesized by the method of grafting metal ions. The bidentate coordination mode of Cu(Ⅱ) ions and the existance of dinuclear structure on the SiO2 surface were confirmed by complexation titration and spectral analyses. The magnetic moment data of Cu2(OEt)2/SiO2 revealed that there are strong antiferromagnetic couplings between the Cu(Ⅱ) ions on the surface of SiO2. Chemical absorption towards CO2 and ethylene oxide(EO) by the catalyst was studied by using molecualr probing-IR technique and CO2 and EO molecules are supposed to be chemisorbed in the form of briged structure under synergistic actions of Lewis acid and Lewis base sites on the surface. Under the action of the catalyst CO2 and EO could be catalytically reacted to give ethylene carbonate at 100~120℃.
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Key words:
- binuclear Cu(Ⅱ) complex
- / briging ligand
- / supported catalyst
- / chemisorption
- / ethylene carbonate
- / synthesis
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