The stretching mode of OH-groups with proton donor function of open 2,2-dimethyl-3-ethyl-3-pentanol dimers is investigated in the solvent CCl4 at 260 K. The lifetime of the OH-stretching vibration is determined to be 3.6 +/- 0.2 ps, notably shorter as the one of the nonbonded molecules of 8 ps. The transient spectral holes and satellite holes in the measured sample transmission suggest that the bending vibration of the hydrogen bridge bond is involved in the dynamics offering additional relaxation channels for the OH-vibration of the proton donor group.