CONFORMATIONAL AND ENVIRONMENTAL-EFFECTS ON BACTERIOCHLOROPHYLL OPTICAL-SPECTRA - CORRELATIONS OF CALCULATED SPECTRA WITH STRUCTURAL RESULTS
CONFORMATIONAL AND ENVIRONMENTAL-EFFECTS ON BACTERIOCHLOROPHYLL OPTICAL-SPECTRA - CORRELATIONS OF CALCULATED SPECTRA WITH STRUCTURAL RESULTS
复制标题
DOI：
10.1021/j100378a036
复制
发表时间：
1990-07-26
影响因子：
--
通讯作者：
FAJER, J
中科院分区：
文献类型：
--
作者：
GUDOWSKANOWAK, E;NEWTON, MD;FAJER, J
结论本研究提供了又一个多自旋弛豫研究如何精确描述相对较小自旋群在移动的环境中的微观动力学行为的例子。对于所研究的体系，我们惊奇地发现丙二腈在二氯甲烷溶液中的重取向运动近似于对称的陀螺行为，但分子的对称轴与转动扩散张量的主轴并不重合。多自旋弛豫可以作为一个敏感的探针，最普遍的，但利用最少的核自旋弛豫机制之一的分子间偶极相互作用。重要的是要认识到，所提出的方法从根本上不同于典型的同位素替代方法，并在不同的复杂程度上检查核自旋弛豫。
Conclusion This study provides yet one more example of how multispin relaxation studies can provide exacting descriptions of the microdynamical behavior of relatively small spin groupings in mobile environments. For the system studied, it was discovered quite suprisingly that the reorientational motions of malononitrile in dichloromethane solution approximate symmetric top behavior—yet the molecular symmetry axis and the principal axis of the rotational diffusion tensor are not coincident. It is also suggested that multispin relaxation can serve as a sensitive probe of one of the most ubiquitous yet least exploited mechanisms of nuclear spin relaxation—the intermolecular dipolar interaction. It is important to recognize that the proposed methodology differs radically from typical isotopic substitution methods and examines nuclear spin relaxation at a different level of sophistication.