IR spectra of boron-stabilized anions in the gas phase.
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.
Oomens
Jos
J
FOM Institute for Plasmaphysics, Rijnhuizen, Edisonbaan 14, NL-3439 MN Nieuwegein, The Netherlands.
Steill
Jeffrey D
JD
Morton
Thomas Hellman
TH