The synthesis of the metastable triple-decker complex [(Cp*Fe)(Cp‴Co)(μ,η⁵:η⁴-As₅)] (3) (Cp* = pentamethyl-cyclopentadienyl, Cp‴ = 1,2,4-tritertbutyl-cyclopentadienyl) is reported. 3 is sensitive toward thermal activation (and in solutions of acetonitrile), which converts 3 selectively into [(Cp*Fe)(Cp‴Co)(μ,η³:η³-As₃)] (4) and [(Cp*Fe)₂(Cp‴Co)₂ (μ₄,η⁴:η⁴:η⁴:η³-As₁₁)] (5). Harsher thermal reaction conditions lead to a further fragmentation into [Cp*Fe(η⁵-As₅)] (1b), [(Cp‴Co)₂(μ,η²:η²-As₂)₂] (6), and [(Cp*Fe)₂(Cp‴Co)(μ₃,η²:η²:η²-As₃)₂] (7), which can be completed by longer reaction times or higher temperatures. The fragmentation was investigated by variable-temperature and time-dependent NMR spectroscopy, and a fine-tuning of the selectivity can be achieved by applying different reaction conditions. All compounds were fully characterized, and their electronic structures were elucidated by DFT calculations.

中文翻译：

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杂双金属砷三层配合物的合成及其裂解化学

亚稳三重双层络合物的合成[（CP * Fe）的（CP'''CO）（μ，η ⁵：η ⁴ -As ₅）]（3）（CP * =五甲基环戊二烯基中，Cp'''= 1,2报道了，4-三叔丁基-环戊二烯基）。3是敏感朝向热激活（和在乙腈中的溶液），其将3选择性为[（CP * Fe）的（CP'''CO）（μ，η ³：η ³ -As ₃）]（4）和[（CP * Fe）的₂（CP'''Co）的₂（μ ₄，η ⁴：η ⁴：η ⁴：η ³ -As ₁₁）]（5）。更苛刻的热反应条件导致进一步分裂成的[Cp *的Fe（η ⁵ -As ₅）]（图1b），[（CP'''Co）的₂（μ，η ²：η ² -As ₂）₂ ]（6）和[（CP * Fe）的₂（CP'''CO）（μ ₃，η ²：η ²：η ² -As ₃）₂ ]（7），可以通过更长的反应时间或更高的温度来完成。通过可变温度和随时间变化的NMR光谱研究了片段化，并且可以通过应用不同的反应条件来实现选择性的微调。所有化合物均经过充分表征，并通过DFT计算阐明了其电子结构。