Chasing the Evasive Fe═O Stretch and the Spin State of the Iron(IV)–Oxo Complexes by Photodissociation Spectroscopy
作者:Erik Andris、Rafael Navrátil、Juraj Jašík、Thibault Terencio、Martin Srnec、Miquel Costas、Jana Roithová
DOI:10.1021/jacs.6b12291
日期:2017.2.22
values. Furthermore, we show the assignment of the spin state of the complexes based on the vibrational modes of a coordinated anion and compare reactivities of various iron(IV)-oxo complexes generated as dications or monocations (bearing an anionic ligand). The coordinated anions can drastically affect the reactivity of the complex and should be taken into account when comparing reactivities of complexes
我们展示了红外光解光谱在测定高价铁 (IV)-氧代配合物 [(L)Fe(O)(X)]2+/+ (L = TMC, N4Py) 的 Fe=O 伸缩频率方面的应用, PyTACN, 和 X = CH3CN, CF3SO3, ClO4, CF3COO, NO3, N3)。我们表明,通过共振拉曼光谱在乙腈溶液中确定的值相对于无偏气相值平均红移 9 cm-1。此外,我们展示了基于配位阴离子振动模式的复合物自旋状态的分配,并比较了作为单阳离子或单阳离子(带有阴离子配体)生成的各种铁 (IV)-氧代复合物的反应性。配位阴离子会极大地影响配合物的反应性,在比较带有不同配体的配合物的反应性时应予以考虑。[(PyTACN)Fe(O)(X)]+ 在不同自旋态下产生并带有不同阴离子配体 X 的反应性比较表明,阴离子的性质比自旋态对反应性的影响更大。三氟甲磺酸盐和高氯酸盐配体倾向于稳定 [(PyTACN)Fe(O)(X)]+