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PtZnH5(-), A σ-Aromatic Cluster.

  • Author(s): Zhang, Xinxing
  • Liu, Gaoxiang
  • Ganteför, Gerd
  • Bowen, Kit H
  • Alexandrova, Anastassia N
  • et al.

Published Web Location

https://doi.org/10.1021/jz500322n
Abstract

We report a joint photoelectron spectroscopic and theoretical study of the PtZnH5(-) cluster anion. This cluster exhibited an unprecedented planar pentagonal coordination for Pt and an unusual stability and high intensity in the mass spectrum. Both are due to the σ-aromaticity found in the H5-cycle supported by the 5d orbitals on the Pt atom. σ-Aromaticity in all-H systems has been predicted in the past but never found in experimentally observed species. Besides fundamental importance, mixed transition-metal hydrides can be found as intermediates in catalytic processes, and thus, the unexpected stability facilitated by σ-aromaticity can be appreciated also in practical applications.

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