| dc.description.abstract | Carbone is a zero-valent carbon as the center stabilized by coordinating groups on both sides. In the field of carbones, Carbodicarbene (CDC) exhibits great potential in the design and application of organic metal catalysts due to its strong Lewis basicity, excellent stability, and diverse flexibility.
In this thesis, we used CDC coordination with monodentate and bidentate bases on rhenium (I) and manganese (I) metals. However, different types of CDC can form metal complexes M(CDC)(CO)4 and M(CDC)(CO)3Cl (M = Re、Mn, X = Cl, Br) with different numbers of carbonyl groups; Among them, the seventh group transition metal will undergo carbon hydrogen bonding activation with the methyl group on the monodentate CDC, coordinating with the metal in the form of covalent bonds to form M(CDC)(CO)4. However, rhenium metal complexes with four carbonyl groups draw special interest. For example, Re(L)(CO)4 were often considered as the intermediate or transient species in the CO2 reduction mechanism, and therefore this species is worth further investigation.
In order to compare the rhenium metal complexes formed by different types of CDC, we identified them using FT-IR and UV-Vis spectra, and explored them with theoretical calculation results; In addition, we also conducted in-depth research on the synthesis reaction mechanism between CDC and rhenium metal, and successfully isolated a metal dislocation structure with CO bridging connection between the metal and CDC from the reaction. Through 1H NMR spectrum monitoring, we identified the intermediate of this reaction.
In addition, to test their potential as electrocatalysts for reducing CO2, we studied the synthesized Re(I) complexes using cyclic voltammetry and found their electrocatalytic feasibility. | en_US |