Probing the Effects of Solute-Solvent Interactions and Solvent Free Volume on the 13C Spin-Lattice Relaxation of C60

探讨溶质-溶剂相互作用和无溶剂体积对 C60 13C 自旋晶格弛豫的影响

• 批准号: 9707163
• 负责人: Art Rodriguez
• 金额: $ 17.2万
• 依托单位: East Carolina University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-01 至 2001-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9707163&HistoricalAwards=false
• 关键词: Probing; Effects; Solute; Solvent; Interactions

The Experimental Physical Chemistry Program supports Art Rodriguez of East Carolina University and Ned H. Martin of The University of North Carolina at Wilmington in their ongoing measurements of spin-lattice relaxation rates as a function of temperature and field strength, in various organic solvents. Their goals are (i) to determine the magnitude of the chemical shift anisotropy (CSA) and spin rotation (SR) contributions to the spin-lattice relaxation rate of buckminsterfullerene(C60) in various solvents; (ii) to determine the relative importance of solute-solvent interactions and solvent free volume on the magnitude of the CSA and SR contributions; (iii) to model C60 in the various solvents; and (iv) to extend these studies to C70. Nuclear magnetic resonance (NMR) relaxation measurements are one of the most powerful techniques for investigating a variety of condensed phase phenomena. The discovery of buckminsterfullerene and other related fullerenes has generated a great deal of interest into the study of its chemical as well as its physical properties. While a number of researchers have focused on investigating the solid state NMR properties of this molecule, very few details are known concerning the condensed phase carbon-13 spin-lattice relaxation rate and factors affecting this mode of relaxation.

实验物理化学项目支持东卡罗莱纳大学的Art Rodriguez和北卡罗来纳大学威尔明顿分校的Ned H. Martin在各种有机溶剂中持续测量自旋-晶格弛豫率作为温度和场强的函数。他们的目标是(i)确定化学位移各向异性（CSA）和自旋旋转（SR）对不同溶剂中巴克敏斯特富勒烯（C60）自旋晶格弛豫速率的贡献的大小；（ii）确定溶质-溶剂相互作用和溶剂游离体积对CSA和SR贡献大小的相对重要性；（iii）模拟不同溶剂中的C60；（iv）将这些研究扩展至C70。核磁共振弛豫测量是研究各种凝聚态现象最有力的技术之一。巴克敏斯特富勒烯和其他相关富勒烯的发现引起了人们对其化学性质和物理性质研究的极大兴趣。虽然许多研究人员都专注于研究这种分子的固态核磁共振特性，但关于凝聚相碳-13自旋晶格弛豫速率和影响这种弛豫模式的因素的细节知之甚少。