三氟甲磺酸锡酯的晶体结构和催化性能  

Structure and catalytic performance of organotin triflate

作　　者：杜治平[1,2] 陈诗锐[1] 沈忱[1] 王公应[2] 

机构地区：[1]绿色化工过程教育部重点实验室湖北省新型反应器与绿色化学工艺重点实验室,湖北武汉430074 [2]中国科学院成都有机化学研究所,四川成都610041

出　　处：《武汉工程大学学报》2011年第8期1-4,9,共5页Journal of Wuhan Institute of Technology

基　　金：国家自然科学基金重点项目(No.20936003);湖北省自然科学基金重点项目(No.2008CDA009);湖北省教育厅科学技术研究项目(No.Q20101511);武汉工程大学校长基金资助

摘　　要：以甲苯为溶剂,通过回流反应n-Bu2SnO和TfOH得到了三氟甲磺酸锡酯,并采用红外光谱和X-射线单晶衍射对其进行了表征.结果表明:化合物属三斜晶系,空间群为Pī,晶胞参数a=0.808 3(1)nm,b=0.868 5(1)nm,c=1.163 6(2)nm,α=90.45(2)°,β=94.24(1)°,γ=101.08(1)°,V=0.799 29(20)nm-3,Z=2;化合物中的锡原子为严重畸变的八面体构型,且三氟甲磺基的强吸电子效应使Sn—O(磺基氧)键中Sn原子的Lewis酸性较强.当其催化碳酸二甲酯与苯酚酯交换合成碳酸二苯酯时,催化剂的强Lewis酸性有利于碳酸二甲酯转化率的提高,但过强的Lewis酸性易致中间体甲基苯基碳酸酯分解;降低强Lewis酸浓度可以显著抑制甲基苯基碳酸酯分解,提高酯交换选择性.The organotin triflate was synthesized by the reflux reaction of n-Bu2SnO with TfOH in toluene and determined by elemental analysis,IR and X-ray diffraction single crystal structure analysis.The results show that the crystal belongs to triclinic,space group Pī with a=0.808 3（1）nm,b=0.868 5（1）nm,c=1.163 6（2） nm,α=90.45（2）°,β=94.24（1）°,γ=101.08（1）°,V=0.799 29（20） nm-3,Z=2.The tin atom was six-coordinated in a severely distorted octahedron configuration,and exhibited the strong Lewis acidity under the influence of the strong electron-withdrawing effect of the sulfonic group.When the compound catalyzed the transesterification of dimethyl carbonate（DMC）and phenol to diphenyl carbonate,its strong Lewis acidity was of benefit to the enhancement of the DMC conversion,but the intermediate methyl phenyl carbonate was easily decomposed on the basis of the excessively strong Lewis acidity.Decreasing the concentration of the strong Lewis acid could observably restrain the decomposition of methyl phenyl carbonate,and improve the transesterification selectivity.

关 键 词：三氟甲磺酸锡酯 晶体结构 酯交换 碳酸二苯酯 碳酸二甲酯 

分 类 号：O614.432[理学—无机化学] O643.361[理学—化学]