The dicarbon bonding puzzle viewed with photoelectron imaging.
Nat Commun 2019;
10:5199. [PMID:
31729361 PMCID:
PMC6858380 DOI:
10.1038/s41467-019-13039-y]
[Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 10/17/2019] [Indexed: 11/09/2022] Open
Abstract
Bonding in the ground state of C\documentclass[12pt]{minimal}
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\begin{document}$${}_{2}$$\end{document}2 is still a matter of controversy, as reasonable arguments may be made for a dicarbon bond order of \documentclass[12pt]{minimal}
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\begin{document}$$2$$\end{document}2, \documentclass[12pt]{minimal}
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\begin{document}$$3$$\end{document}3, or \documentclass[12pt]{minimal}
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\begin{document}$$4$$\end{document}4. Here we report on photoelectron spectra of the C\documentclass[12pt]{minimal}
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\begin{document}$${}_{2}^{-}$$\end{document}2− anion, measured at a range of wavelengths using a high-resolution photoelectron imaging spectrometer, which reveal both the ground \documentclass[12pt]{minimal}
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\begin{document}$${X}^{1}{\Sigma}_{\mathrm{g}}^{+}$$\end{document}X1Σg+ and first-excited \documentclass[12pt]{minimal}
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\begin{document}$${a}^{3}{\Pi}_{{\mathrm{u}}}$$\end{document}a3Πu electronic states. These measurements yield electron angular anisotropies that identify the character of two orbitals: the diffuse detachment orbital of the anion and the highest occupied molecular orbital of the neutral. This work indicates that electron detachment occurs from predominantly \documentclass[12pt]{minimal}
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\begin{document}$$s$$\end{document}s-like (\documentclass[12pt]{minimal}
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\begin{document}$$3{\sigma}_{\mathrm{g}}$$\end{document}3σg) and \documentclass[12pt]{minimal}
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\begin{document}$$p$$\end{document}p-like (\documentclass[12pt]{minimal}
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\begin{document}$$1{\pi }_{{\mathrm{u}}}$$\end{document}1πu) orbitals, respectively, which is inconsistent with the predictions required for the high bond-order models of strongly \documentclass[12pt]{minimal}
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\begin{document}$$sp$$\end{document}sp-mixed orbitals. This result suggests that the dominant contribution to the dicarbon bonding involves a double-bonded configuration, with 2\documentclass[12pt]{minimal}
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\begin{document}$$\pi$$\end{document}π bonds and no accompanying \documentclass[12pt]{minimal}
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\begin{document}$$\sigma$$\end{document}σ bond.
In spite of its apparent simplicity, the dicarbon molecule has a bonding structure which is matter of debate. Here the authors measure high-resolution spectra of the \documentclass[12pt]{minimal}
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\begin{document}$${{\mathrm{C}}}_{2}$$\end{document}C2 anion by photoelectron imaging, revealing a bonding configuration dominated by a double \documentclass[12pt]{minimal}
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\begin{document}$$\pi$$\end{document}π bond, with no accompanying \documentclass[12pt]{minimal}
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\begin{document}$$\sigma$$\end{document}σ bond.
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