Multimetallic cluster complexes as well-defined nano-scale catalysts for novel organic transformations

多金属簇合物由于其邻近金属中心作为独特的有机转化反应位点的适用性而得到广泛研究。我们以前报道过在胺官能团存在下，四核锌簇催化选择性酯交换反应，其选择性与无簇催化剂的反应条件相反。基于四核锌原子簇独特的反应活性，我们将几种多金属原子簇配合物应用于酯转化反应的催化剂。在我们的研究过程中，我们发现，多金属簇和氮基配体的混合物导致形成高活性物种后，配体的簇基序的配位。这种增强效应在锌簇催化的几种酯转化中观察到，此外，八核钴簇在加入2，2 '-联吡啶后成为酯交换的优良催化剂。因此，在催化反应期间通过使用额外配体的这种簇转化是显示高催化性能的一般策略。

Multimetallic cluster complexes have been extensively studied due to their applicability of proximal metal centers as a reactive site for unique organic transformations. We previously reported a tetranuclear zinc cluster catalyzed selective trans-esterification in the presence of amine functionalities, and the selectivity was opposite trend to the cluster catalyst free reaction condition. Based on the unique reactivity of the tetranuclear zinc cluster, we applied several multimetallic cluster complexes as catalysts for ester transformations. During our research, we found that the mixture of multimetallic clusters and nitrogen-based ligands led to the formation of highly reactive species after the coordination of the ligands to the cluster motif. Such enhancement effects were observed in zinc cluster catalyzed several ester transformations, and in addition, octanuclear cobalt clusters became an excellent catalyst for trans-esterification upon addition of 2,2’-bipyridine. Therefore, such cluster transformation during the catalytic reaction by using additional ligands is general strategy for showing high catalytic performance.