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X-ray diffraction and Raman study of pressure-assisted photopolymerization in the ferrocene-doped C 60 crystals
Journal of Polymer Research ( IF 2.6 ) Pub Date : 2021-01-11 , DOI: 10.1007/s10965-021-02411-6
K. P. Meletov , A. V. Kuzmin , S. S. Khasanov , D. V. Konarev

The pressure-assisted photopolymerization in the fullerene complex with ferrocene C60·{Fe(C5H5)2}2 was studied for the first time by simultaneous in-situ Raman and X-ray diffraction (XRD) techniques at pressures up to 8 GPa. The irreversible splitting of the Ag(2) mode in the Raman spectra, resembling pristine fullerene polymerization, was observed at 4.6 GPa. The structural analysis does not show the formation of covalent bonds between adjacent fullerene molecules at a pressure up to 5 GPa. The unit cell volume and interfullerene distances are smooth and monotonous functions of pressure, and the shortest interfullerene distance 9.4 Å at 5 GPa significantly exceeds 9.06 Å typical of fullerene polymers. The changes in the Raman spectra at 4.6 GPa grow with the laser power and exposure time, showing typical photopolymerization phenomena. The distance between ferrocene and fullerene molecules decreases linearly with pressure changing the slope at 2 GPa due to intermolecular interaction crossover. The length of a ferrocene molecule in the complex increases with pressure in contrast to its decrease in a pristine ferrocene crystal. This behavior is associated with a change in the charge state of an iron atom and indicates a charge transfer from ferrocene to fullerene molecules.



中文翻译:

二茂铁掺杂的C 60晶体中压力辅助光聚合的X射线衍射和拉曼研究

首次通过同时原位拉曼光谱和X射线衍射(XRD)技术研究了富勒烯与二茂铁C 60 · {Fe(C 5 H 52 } 2的压力辅助光聚合反应。8 GPa。A g的不可逆分裂(2)在4.6 GPa处观察到类似于原始富勒烯聚合的拉曼光谱模式。结构分析未显示在高达5 GPa的压力下相邻富勒烯分子之间形成共价键。晶胞体积和富勒烯间距是压力的平滑和单调函数,在5 GPa时最短的富勒烯间距9.4Å大大超过了富勒烯聚合物的典型值9.06Å。4.6 GPa时拉曼光谱的变化随激光功率和曝光时间的增长而增长,显示出典型的光聚合现象。二茂铁与富勒烯分子之间的距离随着分子间相互作用的发生而随着压力在2 GPa下改变斜率而线性减小。配合物中二茂铁分子的长度随压力增加而增加,与之相比,原始二茂铁晶体中的二茂铁分子的长度减少。该行为与铁原子的电荷状态的变化有关,并且表明电荷从二茂铁转移至富勒烯分子。

更新日期:2021-01-11
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