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，内华达大学里诺分校化学系的Vincent J. Catalano教授正在探索使用n -杂环碳（NHC）配体来制造发光的多金属组件。NHC配体被认为是比大多数磷化氢更好的sigma供体，更容易合成，并且具有增加π背键的潜力。这些特性允许其过渡金属配合物的键合和光学性质的细微调整。特别是，本提案中描述的具有NHC骨架的聚合物Au-Ag配合物具有强烈的光致发光性，特别适合作为小分子的传感器。首先，将研究长链Au-Ag聚合物的制备及其光学性质。后续的研究将集中在铑、铱、铂和钯的NHC配合物上，这些配合物有望形成延伸的线性链结构，具有不同寻常的基态光学性质。该建议的最终目标将是开发简单的双金属模型配合物，以了解较大的多金属系统的基本性质。这个建议包含了广泛的主题，给各个层次的学生一个广泛的化学教育。Catalano教授通过直接监督内华达大学里诺分校的新x射线晶体学设施，为研究和教育的基础设施做出了贡献。该设施为几个地区主要的本科院校提供服务，如西方学院、内华达大学拉斯维加斯分校、黎巴嫩谷学院和西佛罗里达大学，以及希腊和土耳其的国际合作者。由于该奖项，将开发一门新的晶体学方法“实践”课程，特别是针对有机研究生，并且将强烈鼓励本科生通过独立研究和高级合成课程参与。

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.