Photochromic Ruthenium Sulfoxide Complexes: Ultrafast Spectroscopy and Photomechanical Effects

光致变色钌亚砜络合物：超快光谱和光机械效应

• 批准号: 1112250
• 负责人: Jeffrey Rack
• 金额: $ 33万
• 依托单位: Ohio University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-10-01 至 2015-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1112250&HistoricalAwards=false
• 关键词: Photochromic; Ruthenium; Sulfoxide; Complexes; Ultrafast

The Chemical Structure, Dynamics and Mechanisms Program of the Chemistry Division supports Professor Jeffrey Rack at Ohio University for studies into the development of photochromic ruthenium sulfoxide complexes. Photochromism in these compounds arises from conversion between isomers in which the sulfoxide is bonded to the ruthenium through sulfur and ones in which the sulfoxide is attached to the ruthenium through oxygen. New examples of these compounds will be synthesized to test the role of sterically-hindered ligands on the excited state rate constant for the isomerization. Femtosecond transient absorption spectroscopy will be employed to determine the rate constants along with their wavelength, solvent and temperature dependence. Identification of intermediates on the femtosecond and picosecond timescale is an important goal. Complexes that feature two-color reversible photochromism will be incorporated into polymers that will feature photomechanical effects. Such effects are exceptionally rare and a new procedure for measuring strain in polymers featuring photomechanical effects will be developed.Students associated with this project will be trained in the areas of inorganic, physical, analytical and organic chemistry. The multi-disciplinary nature of the project will demand that the student be aware of literature contributions in disparate research areas. Involvement of underrepresented groups is also a genuine goal of this project. Ohio University is located in Athens, OH a rural, chronically economically depressed area in Appalachia. Ohio University is deeply committed to the education and training of a student population with a significantly higher than national prevalence of low-income, first generation college students. Indeed, of those undergraduate students performing research in the Department of Chemistry and Biochemistry, 40% are from one of the 29 counties in Appalachia. The students associated with this project will be involved in a number of divisional, departmental, College, University and Community outreach and interactive programs.

化学系的化学结构、动力学和机理计划支持俄亥俄大学的Jeffrey Rack教授研究光致变色亚硫醚配合物的开发。这些化合物中的光致变色是亚硫醚通过硫键与Ru键合的异构体和亚硫醚通过氧与Ru键合的异构体之间的转换。将合成这些化合物的新例子，以测试空间位阻配体对异构化的激发态速率常数的作用。飞秒瞬时吸收光谱将被用来确定速率常数以及它们与波长、溶剂和温度的关系。在飞秒和皮秒时间尺度上识别中间体是一个重要的目标。具有双色可逆光致变色特性的络合物将被合并到具有光机械效果的聚合物中。这种效应非常罕见，将开发一种具有光机械效应的新方法来测量聚合物中的应变。与该项目相关的学生将接受无机、物理、分析和有机化学领域的培训。该项目的多学科性质将要求学生意识到不同研究领域的文学贡献。代表人数不足的群体参与也是该项目的一个真正目标。俄亥俄大学位于俄亥俄州雅典，这是阿巴拉契亚地区一个长期经济不景气的农村地区。俄亥俄大学致力于教育和培训学生群体，这些学生群体的低收入第一代大学生的流行率明显高于全国。事实上，在化学和生物化学系进行研究的本科生中，40%来自阿巴拉契亚29个县之一。与这个项目相关的学生将参与一些部门、部门、学院、大学和社区的外展和互动项目。