Structural Determination of a Short-Lived Excited Iron(II) Complex by Picosecond X-Ray Absorption Spectroscopy

Wojciech Gawelda, Van-Thai Pham, Maurizio Benfatto, Yuri Zaushitsyn, Maik Kaiser, Daniel Grolimund, Steven L. Johnson, Rafael Abela, Andreas Hauser, Christian Bressler, and Majed Chergui
Phys. Rev. Lett. 98, 057401 – Published 2 February 2007

Abstract

Structural changes of the iron(II)-tris-bipyridine ([FeII(bpy)3]2+) complex induced by ultrashort pulse excitation and population of its short-lived (0.6ns) quintet high spin state have been detected by picosecond x-ray absorption spectroscopy. The structural relaxation from the high spin to the low spin state was followed over the entire lifetime of the excited state. A combined analysis of the x-ray-absorption near-edge structure and extended x-ray-absorption fine structure spectroscopy features delivers an Fe-N bond elongation of 0.2 Å in the quintet state compared to the singlet ground state.

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  • Received 2 August 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.057401

©2007 American Physical Society

Authors & Affiliations

Wojciech Gawelda1,2, Van-Thai Pham1, Maurizio Benfatto3, Yuri Zaushitsyn1, Maik Kaiser2, Daniel Grolimund2, Steven L. Johnson2, Rafael Abela2, Andreas Hauser4, Christian Bressler1,*,†, and Majed Chergui1,*,‡

  • 1Ecole Polytechnique Fédérale de Lausanne, Laboratoire de Spectroscopie Ultrarapide, ISIC, FSB-BSP, CH-1015 Lausanne, Switzerland
  • 2Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI, Switzerland
  • 3Laboratori Nazionali di Frascati, INFN, CP13, I-00044 Frascati, Italy
  • 4Département de Chimie Physique, Université de Genève, 30 quai Ernest-Ansermet, CH-1121 Genève, Switzerland

  • *Corresponding author.
  • Electronic address: Christian.Bressler@epfl.ch
  • Electronic address: Majed.Chergui@epfl.ch

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Issue

Vol. 98, Iss. 5 — 2 February 2007

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