Thermodynamic Studies of Metal/Sulfur/Hydrogen Systems

该奖项在无机，生物无机和有机化学 该计划将支持对热力学的研究 有机金属反应，Carl D.化学的霍夫 美国迈阿密大学。 虽然霍夫会 研究各种各样的反应，特别是 是钼硫络合物的反应。 这些复合物 之所以被选中进行研究，是因为他们参与了 加氢脱硫催化，其影响除去 燃料中的硫和植物中的固氮作用。 氧化 加入氢、硫化氢、硫醇和二硫化物 将对钼进行研究。 装订的技巧 各种含硫物质--硫醚、硫醇、氢 硫化物、噻吩、二硫化物、金属硫醇盐和硫 二氧化物-钼也将被确定。 %%% 霍夫博士将研究铯硫的能量学 债券 结果将引起广泛兴趣，因为很少有 金属硫热力学基本数据 债券目前可用。 硫可以与金属结合， 多种粘合模式（单，多，桥接）和 这些键的强度受氧化态的影响， 金属和金属周围其他基团的存在。 了解这些因素对钼的影响 案例可以有助于更好地理解和控制 加氢脱硫和氮气催化过程 固定

This award in the Inorganic, Bioinorganic, and Organometallic Program will support research on the thermodynamics of organometallic reactions by Dr. Carl D. Hoff of the Chemistry Department, University of Miami. Although Hoff will investigate a wide variety of reactions, of particular interest are reactions of molybdenum sulfur complexes. These complexes are chosen for study because of their involvement in hydrodesulfurization catalysis, which effects the removal of sulfur from fuels, and nitrogen fixation in plants. Oxidative addition of hydrogen, hydrogen sulfide, thiols, and disulfides to molybdenum will be studied. The enthalpies of binding of various sulfur-containing species--thioethers, thiols, hydrogen sulfide, thiophene, disulfides, metallothiolates, and sulfur dioxide--to molybdenum will also be determined. %%% Dr. Hoff will investigate the energetics of molybdenum-sulfur bonds. The results will be of wide interest because little fundamental data concerning the thermodynamics of metal-sulfur bonds is currently available. Sulfur can bond to metals in a variety of bonding modes (single, multiple, bridging) and the strength of these bonds is influenced by the oxidation state of the metal and the presence of other groups around the metal. Understanding the influence of these factors for the molybdenum case could contribute to a better understanding and control of the catalytic processes of hydrodesulfurization and nitrogen fixation.