Gas phase structure of micro-hydrated [Mn(ClO4)]+ and [Mn2(ClO4)3]+ ions probed by infrared spectroscopy

  • Rajeev K. Sinha
  • Edith Nicol
  • Vincent Steinmetz
  • Philippe Maître
Focus: Ion Spectroscopy

Abstract

Gas-phase infrared photodissociation spectroscopy is reported for the microsolvated [Mn(ClO4)(H2O) n ]+ and [Mn2(ClO4)3(H2O) n ]+ complexes from n = 2 to 5. Electrosprayed ions are isolated in an ion-trap where they are photodissociated. The 2600–3800 cm−1 spectral region associated with the OH stretching mode is scanned with a relatively low-power infrared table-top laser, which is used in combination with a CO2 laser to enhance the photofragmentation yield of these strongly bound ions. Hydrogen bonding is evidenced by a relatively broad band red-shifted from the free OH region. Band assignment based on quantum chemical calculations suggest that there is formation of water—perchlorate hydrogen bond within the first coordination shell of high-spin Mn(II). Although the observed spectral features are also compatible with the formation of structures with double-acceptor water in the second shell, these structures are found relatively high in energy compared with structures with all water directly bound to manganese. Using the highly intense IR beam of the free electron laser CLIO in the 800–1700 cm−1, we were also able to characterize the coordination mode (η2) of perchlorate for two clusters. The comparison of experimental and calculated spectra suggests that the perchlorate Cl—O stretches are unexpectedly underestimated at the B3LYP level, while they are correctly described at the MP2 level allowing for spectral assignment.

Keywords

Perchlorate Coordination Mode Collision Induce Dissociation Coordination Shell B3LYP Level 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Supplementary material

13361_2011_210500758_MOESM1_ESM.ppt (50 kb)
Supplementary material, approximately 51 KB.
13361_2011_210500758_MOESM2_ESM.doc (22 kb)
Supplementary material, approximately 23 KB.
13361_2011_210500758_MOESM3_ESM.ppt (61 kb)
Supplementary material, approximately 62 KB.

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Copyright information

© American Society for Mass Spectrometry 2010

Authors and Affiliations

  • Rajeev K. Sinha
    • 1
  • Edith Nicol
    • 1
  • Vincent Steinmetz
    • 1
  • Philippe Maître
    • 1
  1. 1.Laboratoire de Chimie PhysiqueUniversité Paris-Sud 11 UMR8000 CNRS, Faculté des sciencesOrsay cedexFrance

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