How far can proteins bend the FeCO unit? Distal polar and steric effects in heme proteins and models
作者:Gigi B. Ray、Xiao Yuan Li、James A. Ibers、Jonathan L. Sessler、Thomas G. Spiro
DOI:10.1021/ja00080a019
日期:1994.1
ResonanceRaman (RR) spectra are reported for structurally defined CO adducts of two sterically constrained Fe II porphyrins: PocPiv, in which three of the pivaloylamino pickets of «picketfence» porphyrin (5,10,15,20-tetrakis-[o(pivaloylamino)phenyljporphyrin) are attached to a benzene cap by single methylene groups, and C 2 -Cap, in which a benzene cap is attached by carboxylate links and a pair
共振拉曼 (RR) 光谱报告了两个空间受限的 Fe II 卟啉的结构定义的 CO 加合物:PocPiv,其中三个“栅栏”卟啉(5,10,15,20-tetrakis-[o(新戊酰氨基)苯基卟啉)通过单个亚甲基连接到苯帽上,而 C 2 -Cap,其中苯帽通过羧酸盐连接和一对亚甲基连接到 5,10,15,20 的四个羟基-四(邻羟基苯基)卟啉。尽管两种加合物的 X 射线晶体结构显示出非常相似的 FeCO 几何形状,涉及少量弯曲和倾斜,但它们的振动频率和 RR 增强模式却大不相同