Dynamic NMRstudy of a series of meso-[Co(TRP)(L)2]Cl, where R is an alkyl group and L is a substituted imidazole, has been carried out. While the complexes with unhindered imidazole show no splitting of the signals, those with bulky imidazoles exhibit change in line shape, indicating the hindered imidazole rotation. The activation free energy increases as R and/or L become bulkier. Based on the red-shifted
已经进行了一系列内消旋-[Co(TRP)(L)2 ] Cl的动态NMR研究,其中R为烷基,L为取代的咪唑。咪唑不受阻的配合物未见信号分裂现象,咪唑显着的配合物显示线形变化,表明咪唑旋转受阻。随着R和/或L变大,活化自由能增加。根据这些配合物与未取代的内消旋配合物相比,紫外可见的Soret和Q谱带以及1 H NMR光谱中的低场转移的咪唑质子,得出结论:卟啉环的变形减慢了配体的旋转速率。
Facile syntheses of tetraalkylchlorin and tetraalkylporphyrin complexes and comparison of the structures of the tetramethylchlorin and tetramethylporphyrin complexes of nickel(II)
作者:Abraham Ulman、Judith Gallucci、Diane Fisher、James A. Ibers
DOI:10.1021/ja00542a034
日期:1980.10
Shi, Chunnian; Anson, Fred C., Inorganic Chemistry, 1998, vol. 37, # 5, p. 1037 - 1043