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Reduction of CO2 by Pyridine Monoimine Molybdenum Carbonyl Complexes: Cooperative Metal-Ligand Binding of CO2

机译:吡啶单亚胺钼羰基配合物减少CO2的作用:CO2的金属配体结合

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摘要

[((PMI)-P-Ar)Mo(CO)(4)] complexes (PMI=pyridine monoimine; Ar=Ph, 2,6-di-iso-propylphenyl) were synthesized and their electrochemical properties were probed with cyclic voltammetry and infrared spectroelectrochemistry (IR-SEC). The complexes undergo a reduction at more positive potentials than the related [(bipyridine)Mo(CO)(4)] complex, which is ligand based according to IR-SEC and DFT data. To probe the reaction product in more detail, stoichiometric chemical reduction and subsequent treatment with CO2 resulted in the formation of a new product that is assigned as a ligand-bound carboxylate, [(iPr2PhPMI)Mo(CO)(3)(CO2)](2-), by NMR spectroscopic methods. The CO2 adduct [(iPr2PhPMI)Mo(CO)(3)(CO2)](2-) could not be isolated and fully characterized. However, the CC coupling between the CO2 molecule and the PDI ligand was confirmed by X-ray crystallographic characterization of one of the decomposition products of [(iPr2PhPMI)Mo(CO)(3)(CO2)](2-).
机译:合成[[((PMI)-P-Ar)Mo(CO)(4)]配合物(PMI =吡啶单亚胺; Ar = Ph,2,6-二异丙基苯基),并用循环伏安法测定其电化学性质和红外光谱电化学(IR-SEC)。与相关的[(联吡啶)Mo(CO)(4)]复合物相比,该复合物的还原电位更高,根据IR-SEC和DFT数据,该复合物是基于配体的。为了更详细地探测反应产物,化学计量化学还原和随后的CO2处理导致形成新产物,该产物被指定为与配体结合的羧酸盐[[iPr2PhPMI)Mo(CO)(3)(CO2)]。 (2-),通过NMR光谱法。无法分离出CO2加合物[(iPr2PhPMI)Mo(CO)(3)(CO2)](2-)。但是,通过[[iPr2PhPMI)Mo(CO)(3)(CO2)](2-)的分解产物之一的X射线晶体学表征证实了CO2分子与PDI配体之间的CC偶联。

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