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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Structural changes of conjugated Pt-containing polymetallaynes exposed to gamma ray radiation doses
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Structural changes of conjugated Pt-containing polymetallaynes exposed to gamma ray radiation doses

机译：γ射线辐射剂量下共轭含Pt的多金属金属醚的结构变化

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摘要

The effect of ~(60)Co gamma rays irradiation on the polymetallayne [-Pt(PBu _3)-C≡C-C _6H _4-C _6H _4-C≡C-] _n (Pt-DEBP) of defined chain length corresponding to 10 repeat units, has been studied in detail. The UV-vis absorption spectra of Pt-DEBP have been recorded in solution upon exposure of the polymetallayne at increasing radiation doses in the range up to 90 Gy, with special care to the features related to low doses. Complex modifications of the chemical structure of Pt-DEBP could be accessed through NMR, FTIR, GPC, and XPS characterizations, which support the attack of Cl and H radicals coming from the radiolysis of the solvent, CHCl _3, to the triple C≡C bonds of the backbone, leading to the formation of chlorinated double and single C-C bonds, with a concomitant increase of the molecular weight due to a recombinant effect of oligomer fragments upon irradiation. The presence of vinyl and single chlorinated moieties has been sustained from the simulation of the UV-vis spectra based on theoretical calculations.
机译：〜（60）Coγ射线辐照对定义的链长对应于10的多金属[[Pt（PBu _3）-C≡CC_6H _4-C _6H_4-C≡C-] _ n（Pt-DEBP）重复单元，已被详细研究。 Pt-DEBP的紫外-可见吸收光谱已记录在溶液中，当多金属甲酰胺以高达90 Gy的范围内增加的辐射剂量曝光时，要特别注意与低剂量有关的特征。可以通过NMR，FTIR，GPC和XPS表征对Pt-DEBP的化学结构进行复杂的修饰，这支持了由溶剂CHCl _3的辐射分解引起的Cl和H自由基对三元C≡C的攻击。骨架上的碳键结合，导致形成氯化的双CC键和单CC键，并且由于低聚物片段在辐射下的重组作用，分子量随之增加。基于理论计算，通过UV-可见光谱的模拟，维持了乙烯基和单氯化部分的存在。

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