Temperature-induced Sn(Ⅱ) supramolecular isomeric frameworks as promising heterogeneous catalysts for cyanosilylation of aldehydes  

作　　者：Kai Sheng Li-Ming Fan Xue-Fei Tian Rakesh Kumar Gupta Linna Gao Chen-Ho Tung Di Sun 

机构地区：[1]Key Laboratory of Colloid and Interface Chemistry,Ministry of Education,School of Chemistry and Chemical Engineering,State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,China [2]School of Aeronautics,Shandong Jiaotong University,Jinan 250037,China [3]Department of Chemistry,College of Science,North University of China,Taiyuan 030051,China [4]College of Chemical and Environmental Engineering,Shandong University of Science and Technology,Qingdao 266590,China

出　　处：《Science China Chemistry》2020年第2期182-186,共5页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(21822107,21571115,21827801,21671172);the Natural Science Foundation of Shandong Province(JQ201803,ZR2017MB061,ZR2017ZF003);the Taishan Scholar Project of Shandong Province of China(tsqn201812003);the Qilu Youth Scholar Funding of Shandong University and the Fundamental Research Funds of Shandong University(104.205.2.5);the State Key Laboratory of Pollution Control and Resource Reuse Foundation(PCRRF18019)

摘　　要：Two novel Sn(Ⅱ) supramolecular isomeric frameworks,with the identical formula of {(NH2Me2)2[Sn(BDC)(SO4)]}n,Sn-CP-1-α(1) and Sn-CP-1-β(2)(H2BDC=terephthalic acid) were synthesized under solvothermal condition and fully characterized by single crystal X-ray diffraction(SCXRD),Fourier transform infrared spectroscopy(FTIR),ultraviolet-visible spectroscopy(UVVis),elemental analyses,and thermogravimetric analysis(TGA).Interestingly,the structures of 1 and 2 are governed by the temperature of the reaction,suggesting a temperature-induced supramolecular isomerism.The supramolecular isomers are primarily caused by the different bridging alignments of SO42–.Compounds 1 and 2 display 2 D layer and 3 D framework with different topologies,non-interpenetrated 44-sql and two-fold interpenetrated 4-connected dia topology,respectively.Due to Lewis acid properties of coordinatively unsaturated Sn(Ⅱ) sites in CPs,they have been utilized as heterogeneous catalyst for the cyanosilylation of aldehydes with an excellent conversion yield over 99% under solvent-free conditions.Two novel Sn（Ⅱ） supramolecular isomeric frameworks,with the identical formula of {（NH2Me2）2[Sn（BDC）（SO4）]}n,Sn-CP-1-α（1） and Sn-CP-1-β（2）（H2BDC=terephthalic acid） were synthesized under solvothermal condition and fully characterized by single crystal X-ray diffraction（SCXRD）,Fourier transform infrared spectroscopy（FTIR）,ultraviolet-visible spectroscopy（UVVis）,elemental analyses,and thermogravimetric analysis（TGA）.Interestingly,the structures of 1 and 2 are governed by the temperature of the reaction,suggesting a temperature-induced supramolecular isomerism.The supramolecular isomers are primarily caused by the different bridging alignments of SO42–.Compounds 1 and 2 display 2 D layer and 3 D framework with different topologies,non-interpenetrated 44-sql and two-fold interpenetrated 4-connected dia topology,respectively.Due to Lewis acid properties of coordinatively unsaturated Sn（Ⅱ） sites in CPs,they have been utilized as heterogeneous catalyst for the cyanosilylation of aldehydes with an excellent conversion yield over 99% under solvent-free conditions.

关 键 词：supramolecular isomerism Sn(Ⅱ)coordination polymers CATALYSIS CYANOSILYLATION 

分 类 号：O641.3[理学—物理化学] O643.36[理学—化学]