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

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2020,（2）
• 页码范围: 182-186
• 页数: 5页
• 语种: 英文

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 (UV-Vis),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 2D layer and 3D 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.