VIBRATIONAL-SPECTRA AND STRUCTURE OF COMPLEXES CONTAINING THE HYDROGEN DINITRATE ION

Infrared and Raman spectra of solid hydrogen dinitrate complexes with K+, Rb+, Cs+, (CH3)4N+, trans-(Co py4Cl2)+, Ph4As+, Ph4P+, (C2H5)4N+ and (C4H9)N+ have been recorded and analyzed. The assignments were assisted by deuteration and, in the case of the Cs+, (CH3)4N+, and Ph4As+ complexes, by 15N substitution. Infrared spectra at 50 kbar of the (CH3)4N+ complex were also recorded. The salient features of the i.r. spectra are the lack of fundamental OH bands above 1800 cm-1 and the appearance of a strong absorption centered at about 600 cm-1, both indicating very strong hydrogen bonding. The i.r. and Raman spectra permit the differentiation between the planar and nonplanar types of the hydrogen dinitrate ion. © 1979.