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Photoelectron Imaging Study of the Diplatinum Iodide Dianions [Pt2I6]2– and [Pt2I8]2–

Gibbard, Jemma A.; Verlet, Jan R.R.

Photoelectron Imaging Study of the Diplatinum Iodide Dianions [Pt2I6]2– and [Pt2I8]2– Thumbnail


Authors

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Dr Jemma Gibbard jemma.gibbard@durham.ac.uk
Royal Society University Research Fellow



Abstract

Photoelectron spectroscopy has been used to study the electronic structure, photodetachment, and photodissociation of the stable diplatinum iodide dianions [Pt2I6]2– and [Pt2I8]2–. Photoelectron spectra over a range of photon energies show the characteristic absence of low kinetic energy photoelectrons expected for dianions as a result of the repulsive Coulomb barrier (RCB). Vertical detachment energies of ∼1.6 and ∼1.9 eV and minimum RCBs of ∼1.2 and ∼1.3 eV are reported for [Pt2I6]2– and [Pt2I8]2–, respectively. Both of the diplatinum halides exhibit three direct detachment channels with distinct anisotropies, analogous to the previously reported spectra for PtI2– and PtI–, suggesting a platinum-centered molecular core that dominates the photodetachment. Additionally, evidence for two-photon photodissociation and subsequent photodetachment channels producing I– are observed for both dianions. Finally, an unexplained feature is observed at photon energies around 3 eV, whose origin is considered. Our work highlights the complex electronic structure of the heavy platinum-halide dianions that are characterized by a dense manifold of electronic states.

Citation

Gibbard, J. A., & Verlet, J. R. (2022). Photoelectron Imaging Study of the Diplatinum Iodide Dianions [Pt2I6]2– and [Pt2I8]2–. The Journal of Physical Chemistry A, 126(22), https://doi.org/10.1021/acs.jpca.2c02008

Journal Article Type Article
Online Publication Date May 27, 2022
Publication Date 2022
Deposit Date Jul 18, 2022
Publicly Available Date Jul 18, 2022
Journal The Journal of Physical Chemistry A
Print ISSN 1089-5639
Electronic ISSN 1520-5215
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 126
Issue 22
DOI https://doi.org/10.1021/acs.jpca.2c02008

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