Figure 2.

FT-IR spectra of water cluster and dissolved water. (a) FT-IR spectrum of benzene-d6 mixed with a small amount of water (corresponding to Fig. 1b) at 298 K. (b) FT-IR spectrum of the water cluster and dissolved water in benzene-d6 (corresponding to Fig. 1c) at 298 K. The absorption spectrum of benzene-d6 was subtracted from each measured spectrum. The peaks are assigned to the symmetric (3594 cm⁻¹) and asymmetric (3691 cm⁻¹) vibration modes of water molecules, strongly tetrahedrally coordinated hydrogen bonding (3100–3400 cm⁻¹), and weak hydrogen bonding (3400–3700 cm⁻¹)¹³.