PtZnH5(-), A σ-Aromatic Cluster.
- Author(s): Zhang, Xinxing;
- Liu, Gaoxiang;
- Ganteför, Gerd;
- Bowen, Kit H;
- Alexandrova, Anastassia N
- et al.
Published Web Locationhttps://doi.org/10.1021/jz500322n
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.