Low-valent Chromium - Molecules, Reactivity and Catalysis

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。无机、生物无机和有机金属化学项目支持特拉华大学的Klaus Theopold博士在铬的低价有机金属化合物的反应化学方面的努力，特别强调选择性乙烯低聚化的催化作用。合成了不同环尺寸的顺磁性铬环（由-二氯胺酸酯（nacnac）配体连接的含铬杂环）。研究了这些分子在消去和扩环方面的选择性。非无害二亚胺配体负载的铬配合物也用于研究与乙烯的金属环反应性。金属的电荷和形式氧化态影响乙烯低聚反应。该项目本质上是基础性的，但可能对商业催化剂的开发产生实际影响。选择性催化过程，如这里开发的那些，本质上更可持续，更环保，因为它们避免了不良副产品的产生，更节能。本科和研究生的学生将体验不同的研究方法，并在合成化学和机械化学方面获得强大的背景，这在化学工业中是非常需要的。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). The Inorganic, Bioinorganic, and Organometallic Chemistry Program supports the efforts of Dr. Klaus Theopold of the University of Delaware on the reaction chemistry of low-valent organometallic compounds of chromium, with particular emphasis on the catalysis of selective ethylene oligomerization. The paramagnetic chromacycles (heterocycles containing chromium ligated by beta-diketiminate (nacnac) ligands) of various ring sizes have been synthesized. These molecules are investigated in terms of their selectivity with respect to elimination versus ring expansion. Chromium complexes supported by non-innocent diimine ligands are also used for studies of metallacycle reactivity with ethylene. The charge and formal oxidation state of the metal impacts the ethylene oligomerization reaction. This project is fundamental in nature but may have practical impact on commercial catalyst development. Selective catalytic processes such as those developed here are inherently more sustainable and environmentally benign, as they avoid the production of undesirable byproducts and are more energy efficient. Undergraduate and graduate students experience varied research methodology and gain a strong background in synthetic and mechanistic chemistry, which is in high demand in the chemical industry.