Electron spin relaxation rates for nitridochromium(V) tetratolylporphyrin and nitridochromium(V) octaethylporphyrin in Frozen solution
Electron spin relaxation rates for nitridochromium(V) tetratolylporphyrin and nitridochromium(V) octaethylporphyrin in Frozen solution
复制标题
冷冻溶液中硝基铬(V)四甲苯基卟啉和硝基铬(V)八乙基卟啉的电子自旋弛豫速率
DOI：
--
复制
发表时间：
1994
期刊：
影响因子：
--
通讯作者：
G. Eaton
中科院分区：
文献类型：
--
作者：
R. Konda;J. Du;S. Eaton;G. Eaton
用饱和恢复法和电子自旋回波EPR法分别测定了10 ~ 130 K温度范围内四甲苯基卟啉和八乙基卟啉氮化铬的T1和Tm。1/T1的温度依赖性类似于先前观察到的羟基羧酸的铬（V）络合物。自旋晶格弛豫速率在垂直平面（卟啉平面）中比垂直于该平面更快。1/Tm是取向依赖性的，主轴之间的中间取向观察到的最快速率。1/Tm的取向依赖性随着温度的升高和基体刚度的降低而增加，并且归因于分子运动。
T1 andTm for nitridochromium(V) tetratolylporphyrin and nitridochromium(V) octaethylporphyrin were measured by saturation recovery and electron spin echo EPR, respectively, between 10 and 130 K. The temperature dependence of 1/T1 was similar to that observed previously for chromium(V) complexes of hydroxycarboxylic acids. The spin lattice relaxation rate was faster in the perpendicular plane (the porphyrin plane) than normal to this plane. 1/Tm was orientation dependent with the fastest rates observed for orientations intermediate between the principal axes. The orientation dependence of 1/Tm increased with increasing temperature and decreasing rigidity of the matrix, and is attributed to molecular motion.