JOINT ANALYSIS OF ESR LINESHAPES AND PROTON NMR DISPERSION PROFILES

ESR 线形和质子 NMR 色散分布的联合分析

• 批准号: 8364061
• 负责人: Jack H Freed
• 金额: $ 0.16万
• 依托单位: CORNELL UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8364061
• 关键词: Characteristics; Complex; Contrast Media; Diffusion; Electron Transport Complex III; Equation; Frequencies; Funding; Grant; Ions; Joints; Laboratories; Magnetic Resonance Imaging; Methods; Modeling; Motion; National Center for Research Resources; Poland; Principal Investigator; Property; Protons; Relaxation; Research; Research Infrastructure; Resources; Solutions; Source; Sweden; System; Technology; Time; Transition Elements; United States National Institutes of Health; Work; cost

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. Primary support for the subproject and the subproject's principal investigator may have been provided by other sources, including other NIH sources. The Total Cost listed for the subproject likely represents the estimated amount of Center infrastructure utilized by the subproject, not direct funding provided by the NCRR grant to the subproject or subproject staff. A long-term objective of ACERT in the study of motional dynamics has been to combine the complementary relaxation information obtained from multi-frequency ESR studies of lineshapes and NMR spin-relaxation, in particular the frequency-dependent NMR Dispersion method NMRD. This project, with groups in Poland and Sweden, is to a combined study on ESR and NMRD on solutions of transition metal ion complexes. Initial work is on Gd(III) complexes used as contrast agents in MRI in order to better understand their properties, and to verify the applicability of the commonly used pseudorotational model of transient zero field splitting (ZFS). According to this model the transient ZFS is described by a tensor of a constant amplitude, defined in its own principal axes systems, which changes its orientation with respect to the laboratory frame according to an isotropic diffusion equation with a characteristic time constant (correlation time) reflecting the time scale of the distortional motion.

这个子项目是许多利用资源的研究子项目之一 由NIH/NCRR资助的中心拨款提供。子项目的主要支持 而子项目的主要调查员可能是由其他来源提供的， 包括其他NIH来源。 列出的子项目总成本可能 代表子项目使用的中心基础设施的估计数量， 而不是由NCRR赠款提供给子项目或子项目工作人员的直接资金。 ACERT在运动动力学研究中的一个长期目标是联合收割机将从线形的多频ESR研究和NMR自旋弛豫，特别是频率依赖的NMR色散方法匪RD获得的互补弛豫信息结合起来。该项目与波兰和瑞典的研究小组合作，对过渡金属离子络合物溶液的ESR和匪RD进行联合研究。最初的工作是在Gd（III）配合物用作造影剂在MRI中，以更好地了解他们的属性，并验证常用的伪旋转模型的适用性瞬态零场分裂（ZH）。根据这个模型的瞬态的畸变是由一个张量的恒定振幅，定义在自己的主轴系统，它改变其方向相对于实验室的框架根据各向同性扩散方程的特征时间常数（相关时间）反映的时间尺度的畸变运动。