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采用表面改性和金属嫁接相结合的方法 ,合成了 Si O2 负载的以μ- dialkoxo为桥基配体的双核铜 ( )配合物催化剂 Cu2 (OEt) 2 /Si O2 .络合滴定和红外光谱分析表明 ,铜 ( )离子在改性后的 Si O2 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 ( )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 10 0～ 12 0℃催化反应生成碳酸乙烯酯 .
Cu2 (OEt) 2 / Si O2 was synthesized by the combination of surface modification and metal grafting on Cu2 (OEt) 2 / Si O2 catalyst supported by Si O2 supported on μ-dialkoxo. The results show that Cu (superscript +) ions bond with bidentate ligands on the modified Si O2 surface. The results of magnetic moment measurements show that there is a strong antiferromagnetic spin exchange , Further confirming the existence of surface bridging structure.The chemisorption characteristics of CO2 and EO (ethylene oxide) were studied by infrared molecular probe technique.The results show that the adsorption of Lewis acid and Lewis base formed by the synergistic action of the bridge adsorption state in the role of the catalyst, CO2 and EO at 10 0 ~ 12 0 ° C catalytic reaction of ethylene carbonate.