Facile synthesis of ultrathin metal-organic framework nanosheets for Lewis acid catalysis
ultrathin nanosheet, metal-organic framework, Lewis acid site, Knoevenagel condensation
Ultrathin metal-organic framework (MOF) nanosheets are attracting great interest in catalysis due to their unique and intriguing two-dimensional (2D) features. Although many progresses have been achieved, it is still highly desirable to develop novel strategies for controllable synthesis of the well-defined ultrathin MOF nanosheets. Herein we report a polyvinylpyrrolidone (PVP)-assisted route to synthesize the ultrathin Ni-MOF nanosheets characteristic of 1.5 nm in thickness, in which PVP is reacted with 2-aminoterephthalic acid (H2BDC-NH2) via formation of C=N bond, followed by coordination with Ni2+ ions to form the ultrathin MOF nanosheets. Impressively, when used in the Knoevenagel condensation reactions of propane dinitrile with different aldehydes, ultrathin Ni-MOF nanosheets display the significantly enhanced catalytic activity and good stability in respect with the bulk Ni-MOF, mainly owing to the exposed active sites as well as facile mass transfer and diffusion of substrates and products.
Tsinghua University Press
Xiaofei Zhang,Lin Chang,Zhongjie Yang,Yanan Shi,Chang Long,Jianyu Han,Binhao Zhang,Xueying Qiu,Guodong Li,Zhiyong Tang, Facile synthesis of ultrathin metal-organic framework nanosheets for Lewis acid catalysis. NanoRes.2019, 12(2): 437–440