Infrared photodissociation spectroscopy of ion-radical networks in cationic dimethylamine complexes
Literature Information
Xiangtao Kong, Zhi Zhao, Dongxu Dai, Xueming Yang, Ling Jiang
Infrared photodissociation spectroscopy was employed to establish the general trends in the stepwise growth motif of cationic dimethylamine (DMA)n+ (n = 4–13) complexes. Electronic structure calculations were performed to identify the structure of the low-lying isomers and to assign the observed spectral features. The results showed the preference of the formation of the proton-transferred (CH3)2NH2+ ion core. The (CH3)2NH2+–[(CH3)2N] ion-radical pair contact and the ion-radical separated pair could coexist at n = 4. The [(CH3)2N] radical is separated from the (CH3)2NH2+ ion core by one DMA molecule at n = 4–6 and by two or more DMA molecules in the larger clusters. This suggests that the (CH3)2NH2+–[(CH3)2N] ion-radical contact pair is not stable in the subsequent radiation-induced processes of DMA, and the [(CH3)2N] radical is released from the charged site in the cationic DMA networks.
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Physical Chemistry Chemical Physics

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