Vibrational Spectrum and Structure of Nitryl Chloride

Abstract

An investigation of the infrared spectrum of gaseous NO₂Cl and the Raman spectrum of liquid NO₂Cl results in the following assignment of fundamental frequencies: $${\nu }_1{\mathrm{(a}}_1\text{)=1293\hspace{0.17em}}{\mathrm{cm}}^{\text{−1}},$$ $${\nu }_2{\mathrm{(a}}_1\text{)=794\hspace{0.17em}}{\mathrm{cm}}^{\text{−1}},$$ $${\nu }_3{\mathrm{(a}}_1\text{)=651\hspace{0.17em}}{\mathrm{cm}}^{\text{−1}},$$ $${\nu }_4{\mathrm{(b}}_1\text{)=1685\hspace{0.17em}}{\mathrm{cm}}^{\text{−1}},$$ $${\nu }_5{\mathrm{(b}}_1\text{)=367\hspace{0.17em}}{\mathrm{cm}}^{\text{−1}},$$ $${\nu }_6{\mathrm{(b}}_2\text{)=411\hspace{0.17em}}{\mathrm{cm}}^{\text{−1}}.$$ The structural implications of the data are discussed, and it is concluded that the structure is $\mathrm{Cl}-{\mathrm{N}}_{\mathrm{[open\; phi]}}^{\mathrm{[open\; phi]}}\begin{array}{c}\mathrm{O}\\ \\ \mathrm{O}\end{array}·$ .However, it is not possible to say whether the molecule is planar or pyramidal.