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Topics in Catalysis

, Volume 61, Issue 1–2, pp 106–118 | Cite as

Infrared Spectroscopic Investigation of Structures and N2 Adsorption Induced Relaxations of Isolated Rhodium Clusters

  • Matthias P. Klein
  • Amelie A. Ehrhard
  • Jennifer Mohrbach
  • Sebastian Dillinger
  • Gereon Niedner-Schatteburg
Original Paper

Abstract

This paper presents a combined IR photo dissociation (IR-PD) spectroscopic and DFT computational study of cold Rhodium cluster N2 adsorbate complexes, [Rhi(N2)m]+ = (i,m), in the ranges of i = 6, …, 15 and m = 1, …, 16. DFT modelling of naked Rhodium clusters Rhi +, i = 6, 7, 9 reveals high spin states (10tet, 13tet, and 17tet) of octahedral structures (i = 6, 7), and a tricapped trigonal prism (i = 9). The IR spectra of single N2 adsorptions red shift in line with the established charge dilution model, and they reveal evidence for structural and/or spin isomers in cases of larger clusters (i,1), i ≥ 12. The IR spectra of cluster adsorbate complexes at or close to N2 saturation indicate strong vibrational couplings and likely isomorphism. Together, the IR-PD and DFT spectra of the [Rh7(N2)12]+ = (7,12) complex reveal spin quenching into a triplet state—as compared to the 13tet state of naked Rh7 +. This study is the starting point for systematic investigations of Rhodium cluster N2 adsorbates and of Rhodium Iron hetero cluster N2 adsorbates, which are work in progress.

Keywords

Rhodium clusters N2 adsorption Infrared spectroscopy Adsorbate induced surface relaxation 

Notes

Acknowledgements

This work was supported by the DFG founded transregional collaborative research center SFB/TRR 88 “3MET.de” and by the state research center OPTIMAS. We thank Thomas Kolling for technical assistance and valuable discussions. We acknowledge valuable comments and suggestions by the reviewers.

Supplementary material

11244_2017_865_MOESM1_ESM.docx (2.6 mb)
Supplementary material 1 (DOCX 2648 KB)

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© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.Fachbereich Chemie and Forschungszentrum OPTIMAS, TU KaiserslauternKaiserslauternGermany

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