Mononuclear and dinuclear gold(<scp>i</scp>) complexes with a caffeine-based di(N-heterocyclic carbene) ligand: synthesis, reactivity and structural DFT analysis
been performed to support these findings. The reactivity of the gold(I) complexes has been evaluated in the oxidative addition of halogens. The reaction allows accessing the corresponding mono- and dinuclear gold(III) complexes, which are stable and do not interconvert. With the mononuclear complex, species of general formula [AuX2(diNHC)](BF4) (X = Cl and I) have been isolated and a systematic structural
在金前驱体AuCl(SMe)存在下,通过碱辅助金属化合适的二(偶氮鎓)盐,合成了两个新的具有咖啡因的二(N-杂环卡宾)配体(diNHC)的金(I)配合物。2)。在动力学控制的条件下,该反应提供了带有diNHC配体螯合金中心的单核阳离子配合物,而热力学更稳定的配合物是具有两个桥接diNHC配体的双核物质。两种络合物的溶液均已通过质谱,1 H,13 C和DOSY NMR光谱表征。还进行了单核-核转化,并进行了动力学实验,得出了二级速率常数k=(1.46±0.01)×10 -2 dm 3 mol -1 s -1在313 K下的CD 3 CN中。已经执行了密度泛函理论(DFT)计算以支持这些发现。在卤素的氧化加成中已经评估了金(I)配合物的反应性。该反应允许进入稳定且不会相互转化的相应的单核和双核金(III)配合物。使用单核络合物,已分离出通式为[AuX 2(diNHC)](BF 4)(X = C