Infrared Intensities of Sodium, Calcium, and Potassium Hydroxide Crystals

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Abstract
The absolute intensities of OH− and OD− stretching absorptions in Na, Ca, and K hydroxide crystals have been measured in the films formed on a quartz window. The thickness of the films was determined by chemical or flame photometric analysis of the solution in which the sample film had been dissolved. The expected difference between OH− and OD− in the dipole-moment derivative, (dμ/dr)OD–(dμ/dr)OH, was observed to be in excellent or moderate agreement with the theoretical value given from Ellison’s equation for Na and Ca. This result also proves that the polarization of dμ/dr is in the O−–H+(D+) direction in these cases. As for K hydroxides, although the numeric results are rather dubious, the intensities are apparently by far greater than the two others, confirming the hydrogen-bond formation in this crystals, as suggested by the crystal structure and vibrational frequencies.

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