Etude par spectroscopie infrarouge de la coordination et de l'adsorption de (CD3)2CHOH. I - coordination avec des acides de lewis

Abstract

The A ← 0(H)CH(CD₃)₂ and A ← (CD₃)₂CHOH]₂ interactions were shown by an infrared study of complexes in carbon tetrachloride solutions, where A is a Lewis acid : SbCl₅, AlCl₃, AlBr₃, SnCl₄, BF₃, Eu(fod)₃, ICl, I₂ and S0₂. In the coordination, the ν(OH) and ν(CO) frequencies decrease and the intensities increase, it is the opposite trend for the ν(CH) vibration ; the ν(CD₃) band appears as a doublet ; there is no significant effect on the γ(CH) and {δ(CH), δ(OH)} frequencies. The complexation enthalpies, for Brönsted or Lewis acids, and the Δ$\text{ν}$(CH) shifts are linearly correlated.