Vibrational studies and molecular motions in tetramethylammonium perchlorate

Infrared and single‐crystal Raman spectra (20–5000 cm−1) of (CH3)4NClO4 were studied in the temperature range 90–320 K. Low‐temperature vibrational studies at 90 K indicated freezing out of the disorder of the anions with an increased number of molecules. Copyright © 1991 John Wiley & Sons, Ltd.