Square planar platinum(II) complexes have been known for 150 years and pincer complexes, supported by a tridentate chelating ligand such as terpyridyl, have been known for more than 70 years. The development of cyclometallated platinum(II) pincer complexes, in which the tridentate ligand forms one or more platinum–carbon bonds, has been much more recent. Particularly, in terms of their solution and solid-state luminescence these cyclometallated complexes show substantial advantages over their terpyridyl analogues. This tutorial review introduces the reader to the area of platinum(II) cyclometallated pincer chemistry and shows the advantage of having an alkynyl group in the fourth coordination site on the metal. The basic design principles for the preparation of highly luminescent platinum(II) cyclometallated pincer complexes are outlined and the strategy to improve the luminescence further by chemical manipulation of the pincer ligand and of the auxiliary ligand in the fourth coordination site are illustrated with recent examples from the literature. Recent applications of these cyclometallated pincer complexes in the area of opto-electronics is described, with emphasis on their use in OLEDs, OFETs and as NLO materials as well as demonstrating their potential use as triplet photosensitizers and as metal ion sensors. The aim of this review is to show the recent advances in this rapidly developing research field and to highlight the future promise of these materials.

中文翻译：

---

环金属化三齿铂（II）芳基乙炔化物络合物：新瓶装旧葡萄酒

方形平面铂（II）配合物已知已有150年之久，而由三齿螯合配体（如吡啶基）支撑的钳状配合物已有70多年了。三环配体形成一个或多个铂-碳键的环金属化铂（II）钳形络合物的开发是最近的事。特别地，就其溶液和固态发光而言，这些环金属化的配合物相对于其吡啶基类似物显示出显着的优势。本教程复习向读者介绍了铂金领域（II）环金属化的钳子化学反应，并显示出在金属的第四个配位部位具有炔基的优势。制备高发光铂金的基本设计原理（二）概述了环金属化的钳子配合物，并通过文献中的最新实例说明了通过化学操作钳子配体和辅助配体在第四配位位点进一步改善发光的策略。描述了这些环金属化的钳形配合物在光电领域的最新应用，重点是它们在OLED，OFET和NLO材料中的应用，以及它们在三重态光敏剂和金属离子传感器中的潜在用途。这篇综述的目的是展示在这个快速发展的研究领域中的最新进展，并强调这些材料的未来前景。