N-Heterocyclic Carbene Ligands as Supports for Metal-Metal Interactions: Coordination Polymers and Dimers

在无机、生物无机和有机金属化学项目的支持下，内华达大学雷诺分校化学系的文森特·J·卡塔拉诺教授正在探索使用N-杂环卡宾(NHC)配体来创建发光的多金属组件。与大多数膦配体相比，NHC配体被认为是更好的sigma供体，更容易合成，并具有增加pi-回键的潜力。这些特性允许微调它们的过渡金属络合物的成键和光学性质。特别是，本方案中描述的具有NHC骨架的聚合物Au-Ag络合物具有强烈的光致发光，特别适合作为小分子的传感器。首先，我们将研究长链金-银聚合物的制备和光学性质。以后的研究将集中在Rh，Ir，Plum和Pd的NHC络合物上，这些络合物有望形成延伸的线性链结构，具有不寻常的基态光学性质。该提案的最终目标将是开发简单的双金属模型化合物，以了解更大的多金属系统的基本性质。这项建议包含了广泛的主题，为所有级别的学生提供了广泛的化学教育。卡塔拉诺教授通过直接监督内华达大学雷诺分校的新X射线结晶学设施，为研究和教育基础设施做出了贡献。该中心主要为西方学院、内华达大学、拉斯维加斯大学、黎巴嫩山谷学院和西佛罗里达大学等地区性本科院校以及希腊和土耳其的国际合作者提供服务。作为这一奖项的结果，将开发一门专门针对有机研究生的新的晶体方法实践课程，并将通过独立研究和高级合成课程大力鼓励本科生参与。

With the support of the Inorganic, Bioinorganic and Organometallics Chemistry Program, Professor Vincent J. Catalano of the Department of Chemistry at the University of Nevada, Reno is exploring the use of N-heterocyclic carbene (NHC) ligands to create luminescent, multimetallic assemblies. The NHC ligands are considered better sigma donors than most phosphines, are easier to synthesize, and have the potential for increased pi-backbonding. These characteristics allow for subtle tuning of the bonding and optical properties of their transition metal complexes. In particular, polymeric Au-Ag complexes with NHC backbones described in this proposal are intensely photo-luminescent and are particularly well-suited to act as sensors for small molecules. Initially, the preparation and optical properties of long-chain, Au-Ag polymers will be studied. Later studies will focus on rhodium, iridium, platinum and palladium NHC complexes which are expected to form extended linear chain structures, with unusual ground-state optical properties. The final goal of the proposal will be to develop simple bimetallic model complexes to understand the fundamental properties of the larger poly-metallic systems. This proposal incorporates a broad range of topics giving students at all levels a broad education in chemistry. Professor Catalano contributes to the infrastructure for research and education by directly overseeing the new X-ray crystallographic facility at the University of Nevada at Reno. This facility serves several regional primarily undergraduate institutions such as Occidental College, University of Nevada, Las Vegas, Lebanon Valley College and the University of West Florida as well as international collaborators in Greece and Turkey. A new "hands-on" course in crystallographic methods, targeted especially to organic graduate students, will be developed as a result of this award and undergraduate participation will be strongly encouraged through independent research and the Advanced Synthesis course.