Related Experiment Video
Updated: Jun 11, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
Published on: July 27, 2018
IR spectra of boron-stabilized anions in the gas phase
Jos Oomens1, Jeffrey D Steill, Thomas Hellman Morton
1FOM Institute for Plasmaphysics, Rijnhuizen, Edisonbaan 14, NL-3439 MN Nieuwegein, The Netherlands.
Abstract:
Action spectroscopy of gaseous Me(3)BF(-) and Me(2)BCH(2)(-), determined using IR multiple photon dissociation (IRMPD), exhibits experimental peak positions in good agreement with those predicted by anharmonic DFT calculations at the B3LYP/aug-cc-pVTZ level. Comparing spring constants among boron-carbon bonds and consideration of isoelectronic systems reveals that the anions have B-CH(3) bonds a factor of 1.3-1.4 weaker than those in neutral trimethylboron, suggesting a greater role for hyperconjugation in B(CH(3))(3) than inferred from previous vibrational spectroscopic studies.
Related Concept Videos
Atomic Emission Spectroscopy: Lab
IR Spectrum Peak Broadening: Hydrogen Bonding
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular hydrogen bonding...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
Atomic Spectroscopy: Absorption, Emission, and Fluorescence
UV–Vis Spectroscopy: Molecular Electronic Transitions
Atomic Emission Spectroscopy: Instrumentation

