Preparation、Characterization、Catalytic Study Of Microporous Palladium-loading MOFs As Heterogeneous Catalysts And Study Of Covariance NMR Spectroscopy

In this work,the application of solid state NMR in materials and the improvement of NMR method were studied, including:1)Microporous Palladium-loading MOFs as heterogeneous catalysts-preparation,characterization and catalytic study.2)The dependence of signal-to-noise ratio on number of scans in covariance spectroscopy. Specifically, the main results include:1. Under the direction of 31P DQF SSNMR, we developed a new heterogeneous palladium catalyst prepared by highly-symmetrical organic ligands on the basis of the technique widely used for MOFs (UiO-66) synthesis, denoted as Pd-UiO. Pd-UiO possesses a highly-ordered microporous three-dimensional structure and it displays good catalytic activity in the Sonogashira coupling reactions.2. NMR suffers from a very poor sensitivity and thus requires most of the time numerous signal to obtain a decent signal-to-noise ratio(SNR), particularly to acquire two-dimensional (2D) spectra. Two-dimensional covariance (C0V2D) data treatment applied to indirect dimension provides a powerful alternative to FT2D, which leads to considerable reduction of experimental time and optimal resolution along the indirect dimension. The dependence of signal-to-noise ratio on the number of scans in covariance spectroscopy has been systematically analyzed for the first time with the intriguing relationship of SNRcov ∝(?)...