when CD3OD is used in place of CH3OH as a solvent. A crystallographically characterized cis thiolate-ligated high-valent iron oxo, [FeIV(O)(SMe2N4(tren))]+ (11), is shown to form en route to hydroxo 9. Electronic structure calculations were shown to be consistent with 11 being an S = 1 Fe(IV)═O with an unusually high νFe–O stretching frequency at 918 cm–1 in line with the extremely short Fe–O bond (1
在这里,我们检查了 O 2衍生的脂肪族
硫醇盐连接的 Fe-过氧、Fe-羟基和 Fe(IV) 氧代化合物的电子和几何结构特性。后者裂解强 C-H 键 (96 kcal mol –1 ),与异
青霉素 N 合酶 (I
PNS) 裂解的缬
氨酸 C-H 键相当。停流动力学研究表明,与[Fe II (S Me2 N 4 (tren))] + ( 3 )结合的 O 2势垒极低 ( E a = 36(2) kJ mol –1 ),如理论上为 I
PNS 预测。与3结合的分子氧被证明是可逆的,并且是一种超氧中间体 [FeIII (S Me2 N 4 (tren))(O 2 )] + ( 6 ),在 -40 °C 下反应的前 25 ms 中形成,在速率确定之前 ( E a = 46(2) kJ mol –1 ) 形成过氧桥接 [(S Me2 N 4 (tren))Fe(III)] 2 (μ-O 2 ) 2+ ( 7