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Arsenic‐Rich Polyarsenides Stabilized by Cp*Fe Fragments
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2017-05-16 , DOI: 10.1002/anie.201702903
Monika Schmidt 1 , David Konieczny 1 , Eugenia V. Peresypkina 1, 2, 3 , Alexander V. Virovets 1, 2, 3 , Gabor Balázs 1 , Michael Bodensteiner 1 , Felix Riedlberger 1 , Hannes Krauss 1 , Manfred Scheer 1
Affiliation  

The redox chemistry of [Cp*Fe(η5‐As5)] (1, Cp*=η5‐C5Me5) has been investigated by cyclic voltammetry, revealing a redox behavior similar to that of its lighter congener [Cp*Fe(η5‐P5)]. However, the subsequent chemical reduction of 1 by KH led to the formation of a mixture of novel Asn scaffolds with n up to 18 that are stabilized only by [Cp*Fe] fragments. These include the arsenic‐poor triple‐decker complex [K(dme)2][{Cp*Fe(μ,η2:2‐As2)}2] (2) and the arsenic‐rich complexes [K(dme)3]2[(Cp*Fe)2(μ,η4:4‐As10)] (3), [K(dme)2]2[(Cp*Fe)2(μ,η2:2:2:2‐As14)] (4), and [K(dme)3]2[(Cp*Fe)444:3:3:2:2:1:1‐As18)] (5). Compound 4 and the polyarsenide complex 5 are the largest anionic Asn ligand complexes reported thus far. Complexes 25 were characterized by single‐crystal X‐ray diffraction, 1H NMR spectroscopy, EPR spectroscopy (2), and mass spectrometry. Furthermore, DFT calculations showed that the intermediate [Cp*Fe(η5‐As5)], which is presumably formed first, undergoes fast dimerization to the dianion [(Cp*Fe)2(μ,η4:4‐As10)]2−.

中文翻译:

Cp * Fe片段稳定的富砷多砷化物

的氧化还原化学的[Cp *的Fe(η 5 -As 5)](1中,Cp * =η 5 -C 55)通过循环伏安法进行了研究,揭示类似于其同类打火机的氧化还原行为的[Cp *的Fe(η 5 -P 5)]。然而,随后的KH化学还原1导致形成仅由[Cp * Fe]片段稳定的新型As n支架与n多达18的混合物。其中包括贫砷三层复合物[K(dme)2 ] [{Cp * Fe(μ,η2 :2 -As 2)} 2 ](2)和富含砷的络合物[K(dme)3 ] 2 [(Cp * Fe)2(μ,η4 :4 -As 10)](3),[K(dme)2 ] 2 [(Cp * FE)2(μ,η 2:2:2:2 -As 14)](4),和[K(DME)3 ] 2 [(CP * FE)4(μ 4,η 4:3:3: 2:2:1:1‐ As 18)](5)。化合物4和聚砷化物络合物5是最大的阴离子As n迄今报道的配体配合物。配合物25的特征在于单晶X射线衍射,1 H NMR光谱,EPR光谱(2)和质谱。此外,DFT计算表明,在中间的[Cp *的Fe(η 5 -As 5)] - ,其被推测首先形成,经历快速的二聚化,以二价阴离子[(CP * Fe)的2(μ,η 4:4 -As 10)] 2−
更新日期:2017-05-16
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