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Unimolecular Double Photoionization-Induced Processes in Iron Pentacarbonyl
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2021-10-26 , DOI: 10.1021/acs.inorgchem.1c02533 Roberto Linguerri 1 , Emelie Olsson 2 , Gunnar Nyman 3 , Majdi Hochlaf 1 , John H D Eland 4 , Raimund Feifel 2
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2021-10-26 , DOI: 10.1021/acs.inorgchem.1c02533 Roberto Linguerri 1 , Emelie Olsson 2 , Gunnar Nyman 3 , Majdi Hochlaf 1 , John H D Eland 4 , Raimund Feifel 2
Affiliation
The dissociations of nascent Fe(CO)5++ ions created by 40.81 eV photoionization of iron pentacarbonyl have been examined using threefold and fourfold electron–ion coincidence measurements. The energies and forms of the ions have been explored by high-level calculations, revealing several new structures. The most stable form of Fe(CO)5++ has a quite different geometry from that of the neutral molecule. The dissociation pattern can be modeled as a sequence of CO evaporations followed by two-body charge separations. Each Fe(CO)n++ (n = 1–4) dication is stable in a restricted energy range; as its internal energy increases, it first ejects a neutral CO, then loses CO+ by charge separation at higher energy. In the initial stages, charge-retaining CO evaporations dominate over charge separation, but the latter become more competitive as the number of residual CO ligands decreases. At energies where ionization is mainly from the CO ligands, new Fe–C and C–C bonds are created by a mechanism which might be relevant to catalysis by Fe.
中文翻译:
五羰基铁的单分子双光电离诱导过程
已经使用三重和四重电子 - 离子重合测量检查了由五羰基铁的 40.81 eV 光电离产生的新生 Fe(CO) 5 ++离子的解离。已经通过高级计算探索了离子的能量和形式,揭示了几种新结构。Fe(CO) 5 ++最稳定的形式与中性分子的几何形状完全不同。解离模式可以建模为一系列 CO 蒸发,然后是二体电荷分离。每个 Fe(CO) n ++ ( n = 1–4) dication 在有限的能量范围内是稳定的;随着内能的增加,它首先喷出一个中性的CO,然后失去CO +通过更高能量的电荷分离。在初始阶段,保留电荷的 CO 蒸发在电荷分离中占主导地位,但随着残留 CO 配体数量的减少,后者变得更具竞争力。在电离主要来自 CO 配体的能量下,新的 Fe-C 和 C-C 键是由可能与 Fe 催化相关的机制产生的。
更新日期:2021-12-06
中文翻译:
五羰基铁的单分子双光电离诱导过程
已经使用三重和四重电子 - 离子重合测量检查了由五羰基铁的 40.81 eV 光电离产生的新生 Fe(CO) 5 ++离子的解离。已经通过高级计算探索了离子的能量和形式,揭示了几种新结构。Fe(CO) 5 ++最稳定的形式与中性分子的几何形状完全不同。解离模式可以建模为一系列 CO 蒸发,然后是二体电荷分离。每个 Fe(CO) n ++ ( n = 1–4) dication 在有限的能量范围内是稳定的;随着内能的增加,它首先喷出一个中性的CO,然后失去CO +通过更高能量的电荷分离。在初始阶段,保留电荷的 CO 蒸发在电荷分离中占主导地位,但随着残留 CO 配体数量的减少,后者变得更具竞争力。在电离主要来自 CO 配体的能量下,新的 Fe-C 和 C-C 键是由可能与 Fe 催化相关的机制产生的。