Microwave spectrum, structure, low frequency vibrations, dipole moment and quadrupole coupling constants of dinitrogen trioxide

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Abstract
The structure of N2O3 has been determined from the microwave spectrum of seven isotopic species. The detailed structure associated with the following planar configuration is: [graphic omitted] d(N2N3)= 1.864 Å; d(N2O1)= 1.142 Å; d(N3O4)= 1.202 Å; d(N3O5)= 1.217 Å; ∠O1N2N3= 105.1°∠O4N3N2= 112.7°∠O5N3N2= 117.5°. The torsional vibrational frequency has been measured as 124 ± 25 cm–1. The quadrupole coupling constants for the nitrosyl nitrogen are χaa=–2.34 MHz, χbb= 1.12 MHz, and χcc= 1.22 MHz. The dipole moment has been determined as |µa|= 2.05 D; |µb|= 0.54 D; and |µt|= 2.12 D inclined at an angle of 9.1° to the N—N bond. On the basis of these data, the bonding is discussed.