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Issue 13, 2014
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Variable photon energy photoelectron spectroscopy of tris-cyclopentadienyl lanthanides

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Abstract

The gas phase photoelectron (PE) spectra of LnCp3 (Cp = η-C5H5; Ln = Pr, Nd, Sm), measured with a wide range of photon energy, are reported. Resonances observed in the photon energy regions of 4d to 4f excitation enable identification of ion states resulting from 4f ionization. For all three compounds molecular ion states characteristic of both 4fn and 4fn−1 configurations are observed (Pr, n = 2; Nd, n = 3; Sm, n = 6). The molecular ion ground states have a hole in the uppermost ligand orbital of a′ symmetry and are reached by either ligand or f electron ionization. The results are discussed in the context of the previously reported spectra of the Ce, Yb and Lu analogues. For YbCp3 f orbital/ligand interaction is proposed in the molecular ground state and for CeCp3+ in the molecular ion ground state. For PrCp3 and NdCp3 final state effects are proposed as the origin of the dual configuration structure in their PE spectra. When the contributing orbitals are close in energy the 4f/a′ interaction can give rise to significant covalent bonding even in the absence of effective overlap.

Graphical abstract: Variable photon energy photoelectron spectroscopy of tris-cyclopentadienyl lanthanides

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Article information


Submitted
14 Dec 2013
Accepted
30 Jan 2014
First published
03 Feb 2014

This article is Open Access

Dalton Trans., 2014,43, 5134-5141
Article type
Paper
Author version available

Variable photon energy photoelectron spectroscopy of tris-cyclopentadienyl lanthanides

M. Coreno, M. de Simone, J. C. Green, N. Kaltsoyannis, R. Coates, C. Hunston, N. Narband and A. Sella, Dalton Trans., 2014, 43, 5134
DOI: 10.1039/C3DT53512F

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