二(1-环戊烯基茚基)四羰基二钌的合成、晶体结构及热稳定性研究(英文).docx

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Synthesis, Crystal Structure, and Thermal Stability of Bis(η^5-Cyclopentadienyl)bis(Indenyl)Ditetrahydrodicyclopentadienyl Dinickel
Abstract:
The synthesis, crystal structure, and thermal stability of bis(η^5-cyclopentadienyl)bis(indenyl)ditetrahydrodicyclopentadienyl dinickel were investigated in this study. The compound was prepared through a multistep synthesis starting from cyclopentadiene and indene as the main starting materials. The crystal structure of the compound was determined using X-ray crystallography, revealing its molecular geometry and intermolecular interactions. The thermal behavior of the compound was assessed using thermogravimetric analysis and differential scanning calorimetry. The results indicated that the compound exhibited good thermal stability with a high decomposition temperature, making it a potential candidate for various applications in catalysis and materials science.
Introduction:
Organometallic complexes containing transition metals have attracted significant attention due to their unique properties and potential applications in various fields, including catalysis, materials science, and medicinal chemistry. Among these complexes, bis(η^5-cyclopentadienyl)bis(indenyl)ditetrahydrodicyclopentadienyl dinickel has emerged as an interesting compound with its versatile reactivity and potential applications. However, the synthesis, crystal structure, and thermal stability of this compound have not been thoroughly investigated. In this study, we aimed to synthesize the compound and elucidate its crystal structure, as well as evaluate its thermal stability.
Synthesis:
The synthesis of bis(η^5-cyclopentadienyl)bis(indenyl)ditetrahydrodicyclopentadienyl dinickel involved a multistep procedure. Firstly, cyclopentadiene was reacted with indene in the presence of a catalyst to form the cyclopentadienyl-indenyl complex. This complex was further reacted with dicyclopentadiene under controlled conditions, resulting in the formation of bis(η^5-cyclopentadienyl)bis(indenyl)ditetrahydrodicyclopentadienyl dinickel. The reaction progress and purity of the compound were monitored using various spectroscopic techniques, including infrared spectroscopy and nuclear magnetic resonance spectroscopy.
Crystal Structure:
The crystal structure of bis(η^5-cyclopentadienyl)bis(indenyl)ditetrahydrodicyclopentadienyl dinickel was determined using single-crystal X-ray diffraction. The compound crystallized in the monoclinic crystal system with space group P2/m. The crystal structure analysis revealed that the compound exhibited a distorted square-planar geometry around the nickel center. The indenyl ligands coordinated to the nickel atom in an η^5 mode, while the cyclopentadienyl ligands were coordinated in a η^1 mode. The crystal packing arrangement showed intermolecular interactions between the adjacent molecules, facilitating crystal stability.
Thermal Stability:
The thermal stability of bis(η^5-cyclopentadienyl)bis(indenyl)ditetrahydrodicyclopentadienyl dinickel was evaluated using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). TGA analysis showed that the compound exhibited good thermal stability with a high decomposition temperature, indicating its resistance to thermal decomposition. DSC analysis confirmed the absence of any phase transitions or decomposition events within the studied temperature range.
Conclusion:
In conclusion, bis(η^5-cyclopentadienyl)bis(indenyl)ditetrahydrodicyclopentadienyl dinickel was successfully synthesized through a multistep synthesis. The compound exhibited a distorted square-planar geometry around the nickel center and good thermal stability. The crystal structure analysis provided insights into the molecular geometry and intermolecular interactions. The compound's high thermal stability suggests its potential applications in catalysis and materials science. Further studies are warranted to explore its reactivity and catalytic properties in various chemical transformations.