Synthesis and characterization of a -ketoenamine COF Tp-BD(Me)₂ at mild temperatures

In this work, we investigated the morphology and crystallinity changes of a beta-ketoenamine COF, Tp-BD(Me)(2) (Tp=1,3,5-triformylphloroglucinol, BD(Me)(2)=3,3(')-dimethyl-[1,1(')-biphenyl]-4,4(')-diamine), with different reaction time and temperatures. Powder X-ray diffraction (PXRD) and Fourier-transform infrared (FTIR) spectra tests confirmed the synthesis of Tp-BD(Me)(2), which has a specific beta-ketoenamine linkage and a probable eclipsed stacking mode. At a reaction temperature of 50(degrees)C, the morphology of Tp-BD(Me)(2) underwent a progressive process of growing, extending and splitting. The band gaps of the Tp-BD(Me)(2) obtained with the reaction time of 18-24 h were calculated near 2.0 eV. The BET surface areas of the Tp-BD(Me)(2) were around 400-600 m(2)/g. It is not an optimal choice if the reaction temperature is below 50(degrees)C, which could cause a low crystallinity and disordered morphology. However, slightly improving the reaction temperature to 60(degrees)C is beneficial for generating high-crystallinity Tp-BD(Me)(2.)