1. Revisiting the structure of [PdAu9(PPh3)8(CN)]2+ produced by atmospheric pressure plasma irradiation of [PdAu8(PPh3)8]2+ in methanol.
- Author
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Imagawa, Takumi, Ito, Shun, Hennrich, Frank, Neumaier, Marco, Weis, Patrick, Koyasu, Kiichirou, Kappes, Manfred M., and Tsukuda, Tatsuya
- Subjects
ATMOSPHERIC pressure plasmas ,ION mobility spectroscopy ,FOURIER transform infrared spectroscopy ,METHANOL ,METAL clusters ,DENSITY functional theory - Abstract
Some of the authors of the present research group have previously reported mass spectrometric detection of [PdAu
9 (PPh3 )8 (CN)]2+ (PdAu9 CN) by atmospheric pressure plasma (APP) irradiation of [MAu8 (PPh3 )8 ]2+ (PdAu8 ) in methanol and proposed based on density functional theory (DFT) calculations that PdAu9 CN is constructed by inserting a CNAu or NCAu unit into the Au–PPh3 bond of PdAu8 [Emori et al., J. Chem. Phys. 155, 124312 (2021)]. In this follow-up study, we revisited the structure of PdAu9 CN by high-resolution ion mobility spectrometry on an isolated sample of PdAu9 CN with the help of dispersion-corrected DFT calculation. In contradiction to the previous proposal, we conclude that isomers in which an AuCN unit is directly bonded to the central Pd atom of PdAu8 are better candidates. This assignment was supported by Fourier transform infrared and ultraviolet–visible spectroscopies of isolated PdAu9 CN. The simultaneous formation of [Au(PPh3 )2 ]+ and PdAu9 CN suggests that the AuCN species are formed by APP irradiation at the expense of a portion of PdAu8 . These results indicate that APP may offer a unique method for transforming metal clusters into novel ones by generating in situ active species that were not originally added to the solution. [ABSTRACT FROM AUTHOR]- Published
- 2024
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