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The hydrogen-bonding network formed between a triaminotriazine amphiphile (2C18TAZ, 1) and complementary barbituric acid (BA, 2) at the air−water interface is investigated by polarization-modulated infrared reflection absorption spectroscopy (PM-IRRAS). The molecular structure and orientation of the 1:1 hydrogen-bonding network at the air−water interface is revealed in this study. Without the addition of BA to the subphase, the NH2 scissoring of 2C18TAZ appeared in the spectrum as a broad negative absorption band between 1660 and 1605 cm-1, indicating its perpendicular orientation to the air−water interface. When BA was added to the subphase, the NH2 scissoring absorption band from the triaminotriazine moiety disappeared due to the complementary hydrogen bonding of BA to the 2C18TAZ monolayer. The formation of the rigid 1:1 hydrogen-bonding network also resulted in the disappearance of one of the ring quadrant stretch absorption bands of the 2C18TAZ molecule. New bands which are attributed to the vibratio...

Polarization-Modulated Infrared Reflection Absorption Spectroscopic Studies of a Hydrogen-Bonding Network at the Air−Water Interface