π- hydrogen bonding between water and aromatic hydrocarbons at high temperatures and pressures

摘要: Infrared OH stretching absorption of HDO isolated in aromatic hydrocarbons have been measured at temperatures 473 and 523 K pressures the 100–350 bar range. The peak frequencies are dependent on solvents their order, benzene>toluene>ethylbenzene>cumene>o-xylene∼m-xylene>mesitylene, is exactly same as order for ionization potentials hydrocarbons. Shifts from that hexane, which was a reference temperature pressure, were analyzed using charge transfer theory hydrogen bonding. Distances between water molecule solvent phenyl ring estimated to be 2.8±0.1 2.9±0.1 A K, respectively. These values consistent with structure water–benzene complex determined by jet-cooled microwave spectroscopy. facts suggest π-hydrogen bond exists even high under pressure.