As an NNN-tridentate ligand, the 2,2':6',2"-terpyridine plays an important role in coordination chemistry. With three coordination sites and low LUMO, terpyridine and its derivatives are one of the typical Pincer ligand and/or non-innocent ligands in transition metal catalysis. Interesting catalytic reactivities have been obtained with these tpy-metal complexes targeting some challenging transformations, such as C-C bond formation and hydrofunctionalization. On the other hand, terpyridine ligands can form "closed-shell" octahedral complexes, which provide a linear and stable linkage in supramolecular chemistry. Numerous supramolecular architectures have been achieved using modified terpyridine ligands including Sierpiński triangles, hexagonal gasket and supramolecular rosettes. This review presents a summary of recent progress regarding transition metal-terpyridine complexes with the focus on their applications in catalysis and supramolecular structure construction. Facile synthesis of terpyridine derivatives is also described. We hope this article can serve to provide some general perspectives of the terpyridine ligand and their applications in coordination chemistry.

中文翻译：

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三联吡啶-金属配合物：在催化和超分子化学中的应用。

2,2':6',2"-三联吡啶作为NNN-三齿配体，在配位化学中发挥着重要作用。三联吡啶及其衍生物具有三个配位位点和低LUMO，是典型的Pincher配体和/或过渡金属催化中的非无害配体。这些 tpy-金属配合物针对一些具有挑战性的转化（例如 CC 键形成和氢功能化）获得了有趣的催化反应活性。另一方面，三联吡啶配体可以形成“闭壳”八面体配合物，在超分子化学中提供线性且稳定的连接。使用修饰的三联吡啶配体已经实现了许多超分子结构，包括谢尔宾斯基三角形、六角形垫片和超分子玫瑰花结。本综述总结了过渡金属-三联吡啶配合物的最新进展，重点关注其在催化和超分子结构构建中的应用。还描述了三联吡啶衍生物的简便合成。我们希望本文能够为三联吡啶配体及其在配位化学中的应用提供一些一般观点。