JOINT ANALYSIS OF ESR LINESHAPES AND PROTON NMR DISPERSION PROFILES

这个子项目是许多研究子项目中的一个 由NIH/NCRR资助的中心赠款提供的资源。子项目和 研究者（PI）可能从另一个NIH来源获得了主要资金， 因此可以在其他CRISP条目中表示。所列机构为 研究中心，而研究中心不一定是研究者所在的机构。 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。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. 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.