Probing the intermolecular hydrogen bonding of water molecules at the CCl4/water interface in the presence of charged soluble surfactant

The molecular structure and hydrogen bonding of water molecules at the CCl4/water interface in the presence of a charged soluble surfactan t has been explored in this study using vibrationa l sum frequency generation . By examining OH stretching modes that are highly sensitive to the local hydrogen bonding environment it is found that water molecules at the CCl4/water interface both in the presence and absence of a charged soluble surfactan t are predominantly in a tetrahedral arrangemen t much like the structure of ice. Isotopic dilution studies have been employed to further characteriz e this icelike interfacia l structure . A blueshift of approximately 120 cm of the icelike OH stretching mode is observed upon dilution with D2O. The first vibrationa l spectra of the OH stretching mode from uncoupled HOD molecules at the CCl4/water interface is also reported. © 1997 American Institute of Physics. �S0021-9606�97�03346-1�