The new σ -alkynyl iron(II) complex Cp(CO) 2 Fe-C≡C-(2-C 4 H 3 S) was synthesized with application of several known approaches based on the transition metal (Pd/Cu–, Au–, Cu– and Pd–) catalyzed Fe–C coupling reactions of 2-ethynylthiophene or 2-[(trimethylsilyl)ethynyl]thiophene with cyclopentadienyliron dicarbonyl iodide. The yield of the complex in these reactions was found to strongly depend on the catalyst used. The conditions, catalysts, and reagents that provide the highest yields of the desired 2-thienylethynyl iron complex were determined. The complex was characterized by IR, 1 H and 13 C NMR spectroscopy. The molecular structure of Cp(CO) 2 Fe–C≡C-(2-C 4 H 3 S) established by X-ray diffraction analysis exhibits a three-leg piano stool geometry. The redox properties of the new complex were studied.

中文翻译：

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过渡金属催化的 Fe-C 偶联反应合成二羰基（2-噻吩基乙炔基）（η5-环戊二烯基）铁配合物：光谱、结构和电化学研究

新的 σ-炔基铁 (II) 配合物 Cp(CO) 2 Fe-C≡C-(2-C 4 H 3 S) 是通过应用几种基于过渡金属（Pd/Cu-、Au –、Cu– 和 Pd–) 催化 2-乙炔基噻吩或 2-[（三甲基甲硅烷基）乙炔基]噻吩与环戊二烯基二羰基碘的 Fe-C 偶联反应。发现这些反应中络合物的产率很大程度上取决于所用的催化剂。确定了提供所需 2-噻吩基乙炔基铁络合物最高产率的条件、催化剂和试剂。该配合物通过IR、 1 H和13 C NMR光谱表征。通过 X 射线衍射分析建立的 Cp(CO) 2 Fe–C≡C-(2-C 4 H 3 S) 的分子结构显示出三腿钢琴凳几何形状。研究了新配合物的氧化还原特性。