Preparation, characterization and study of the reactivity of high energy intermediates formed in metal-atom reactions

金属原子反应中形成的高能中间体的制备、表征及反应性研究

• 批准号: 109618-2006
• 负责人: Joly, Helen
• 金额: $ 1.97万
• 依托单位: Laurentian University of Sudbury
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2006
• 资助国家: 加拿大
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=335885
• 关键词: Preparation; characterization; study; reactivity; energy

Activated metals have had a significant impact on organic synthesis.  Also, many industrially important processes use metals as catalysts.  The efficiency of the processes depends on the nature of the metal, the material on which it is supported and the techniques available to introduce the metal into the support.  My research program involves studying the reactions of metal atoms with the aim of understanding the mechanisms controlling metal mediated catalysis, surface chemistry and the formation of organometallic compounds.  Metal atoms will be reacted with organic compounds at -196 degrees Celsius in a high vacuum chamber called a 'rotating cryostat'.  Pieces of metal wire or pellets heated in a furnace will be used to generate the metal atoms.  The products generated in the metal atom reactions are special in that their instability affords them extraordinary reactivity.  We will take advantage of the unusual reactivity of these compounds by treating them with appropriate reactants between -196 degrees Celsius and room temperature to provide new synthetic routes with increased reaction rates, product yield and cost efficiency.  Cyclic compounds containing a metal atom, i.e., metallacycles, are important intermediates implicated in many catalytic processes.  We will study how these intermediates are formed as well as their ability to react with compounds containing electron-deficient centres.  In addition, to gaining a better understanding of catalytic processes, we will investigate the nature of the organometallic intermediates formed in a number of different metal atom reactions.  To do this the intermediates will be collected and their structure determined by a spectroscopic technique known as electron paramagnetic resonance (EPR) spectroscopy.  The parameters extracted from the spectra will give us information about the bonding characteristics of metal-centered radicals generated in our reactions.  Some of the systems we will investigate include organomagnanese intermediates, intermediates formed in yttrium atom reactions and organometallic complexes of zerovalent copper.

活性金属对有机合成有着重要的影响。此外，许多工业上重要的过程都使用金属作为催化剂。这些过程的效率取决于金属的性质，我的研究计划包括研究金属原子的反应，目的是了解控制金属的机制介导催化，表面化学和有机金属化合物的形成。金属原子将在-在196摄氏度的高真空室中，称为“旋转低温恒温器”。在熔炉中加热的金属丝或颗粒将用于产生金属原子。金属原子反应中产生的产物的特殊之处在于它们的不稳定性使它们具有非凡的性能。反应性。我们将利用这些化合物的不寻常的反应性，通过在-196摄氏度和室温之间用适当的反应物处理它们来提供具有增加的反应速率、产物产率和成本效率的新合成路线。含有金属原子的环状化合物，即，金属杂环化合物是许多催化过程中的重要中间体。我们将研究这些中间体的形成以及它们与含缺电子中心的化合物反应的能力。此外，为了更好地理解催化过程，我们将研究在许多不同的金属原子反应中形成的有机金属中间体的性质。为了做到这一点，中间体将是我们收集了大量的样品，并通过电子顺磁共振（EPR）光谱技术确定了它们的结构。从光谱中提取的参数将为我们提供有关反应中产生的金属中心自由基的成键特征的信息。我们将研究的一些体系包括有机锰中间体，钇原子反应中形成的中间体和零价铜的有机金属配合物。