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Drastic Tuning of the Electronic Structures of Diruthenium Aryl Complexes by Isoelectronic Axial Ligands.
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2020-06-22 , DOI: 10.1021/acs.inorgchem.0c01755
Adharsh Raghavan 1 , Fang Yuan 1 , Tong Ren 1
Affiliation  

Reported herein is the use of aryls as axial ligands to manipulate reactivity at the distal metal site through metal–metal–ligand interactions in diruthenium paddlewheel complexes. The vacant ruthenium site in Ru2(ap)4(Ar) (1; ap = 2-anilinopyridinate and Ar = C6H4-4-NMe2), thus rendered reactive, is able to bind a series of isoelectronic ligands to afford three complexes of the form (Y)[Ru2(ap)4](Ar) [Y = CN (2), HC≡C (3), CO (4)], each of which exhibits a distinct electronic structure. While reactions with anionic ligands subsequently result in oxidation of the diruthenium core from Ru2(II,III) to Ru2(III,III), the reaction with CO yields a rare example of a Ru2(II,III)-COaxial adduct. The latter reaction is particularly interesting in its completely reversible change of the ground state from S = 3/2 in 1 to S = 1/2 in 4, the first of its kind seen in Ru2(II,III) species. In general, this work sheds light on the modulation of the electronic structure of diruthenium paddlewheel complexes using distinct coordination environments around each of the ruthenium centers.

中文翻译:

等电轴配体对芳基钌钌配合物电子结构的彻底调谐。

本文报道使用芳基作为轴向配体,通过钌桨轮络合物中的金属-金属-配体相互作用来控制远端金属位点的反应性。Ru 2(ap)4(Ar)(1 ; ap = 2-苯胺基吡啶酸酯和Ar = C 6 H 4 -4-NMe 2)中的空钌位点因此具有反应性,能够与一系列等电子配体结合得到的形式(Y)的[Ru的3个配合物2(AP)4 ](Ar)的[Y = CN - 2),HC≡C - 3),CO(4)],每个都有不同的电子结构。虽然与阴离子配体的反应随后导致钌核心从Ru 2(II,III)氧化为Ru 2(III,III),但与CO的反应产生了Ru 2(II,III)-CO的罕见例子加合物。后者反应处于其完全可逆的从基态的变化特别令人感兴趣的小号= 3 / 21小号= 1 / 24,它的种类的第一个中的Ru看到2(II,III)种。总的来说,这项工作揭示了使用每个钌中心周围不同的配位环境来调节钌pad金属配合物的电子结构。
更新日期:2020-07-06
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