Intermolecular hydrogen bonds BH···HX in solution

The interaction of proton donors with Bu₄NBH₄ and BH₃NEt₃ in hexane and dichloromethane was studied by IR and NMR spectroscopy and it was found for the first time that the proton-accepting centre of interaction of charged and neutral borohydrides with proton donors in solution is the hydrogen atom; the spectral and thermodynamic characteristics of the BH···HX hydrogen bond in solution were obtained and found, from enthalpy values, to be of medium strength.