Structural Changes of Conjugated Pt-Containing Polymetallaynes Exposed to Gamma Ray Radiation Doses

详细信息    查看全文

• 作者：Ilaria Fratoddi ; Erika S. Bronze-Uhle ; Augusto Batagin-Neto ; David M. Fernandes ; Enrico Bodo ; Chiara Battocchio ; Iole Venditti ; Franco Decker ; Maria Vittoria Russo ; Giovanni Polzonetti ; Carlos F. O. Graeff
• 刊名：The Journal of Physical Chemistry A
• 出版年：2012
• 出版时间：August 30, 2012
• 年：2012
• 卷：116
• 期：34
• 页码：8768-8774
• 全文大小：374K
• 年卷期：v.116,no.34(August 30, 2012)
• ISSN：1520-5215

文摘

The effect of ⁶⁰Co gamma rays irradiation on the polymetallayne [鈭扨t(PBu₃)鈥揅鈮鈥揅₆H₄鈥揅₆H₄鈥揅鈮鈭抅_n (Pt-DEBP) of defined chain length corresponding to 10 repeat units, has been studied in detail. The UV鈥搗is 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, CHCl₃, to the triple C鈮 bonds of the backbone, leading to the formation of chlorinated double and single C鈥揅 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鈥搗is spectra based on theoretical calculations.