Structural changes of conjugated Pt-containing polymetallaynes exposed to gamma ray radiation doses.
The effect of (60)Co gamma rays irradiation on the polymetallayne [-Pt(PBu(3))-C≡C-C(6)H(4)-C(6)H(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.
Department of Chemistry, University of Rome Sapienza, P.le A. Moro 5, 00185 Rome, Italy.
Ilaria
I
Fratoddi
Erika S
ES
Bronze-Uhle
Augusto
A
Batagin-Neto
David M
DM
Fernandes
Enrico
E
Bodo
Chiara
C
Battocchio
Iole
I
Venditti
Franco
F
Decker
Maria Vittoria
MV
Russo
Giovanni
G
Polzonetti
Carlos F O
CF
Graeff
D000480:Alkynes / Q000737:chemistry*; D002725:Chloroform / Q000737:chemistry; D005720:Gamma Rays; D008958:Models, Molecular; D008968:Molecular Conformation; D009944:Organoplatinum Compounds / Q000737:chemistry*
D000480:Alkynes; D009944:Organoplatinum Compounds; D002725:Chloroform