HNCN
(Cyanoamidogen/Iminomethyleneamidogen), X 2A"
Species tag 041507
Version1*
Date of EntryJuly 2012
ContributorH. S. P. Müller

Neither of the two names describes HNCN well. In fact, the molecule is best described as being between cyanoamidogen (HN–C≡N) and iminomethyleneamidogen (HN=C=N). The rotational spectrum was recorded between 260 and 400 GHz by
(1) S. Yamamoto and S. Saito, 1994, J. Chem. Phys. 101, 10350.
No hyperfine structure (HFS) splitting was resolved, but fine structure splitting was resolved throughout. HFS from the 1H and the two different 14N nuclei will be resolvable in the microwave region; in the 3 mm region, it will be essentially collapsed for Ka = 0 and 1.
Predictions with uncertainties larger than 0.3 MHz should be viewed with caution.
The ab initio dipole moment components were calculated by
(2) H. S. P. Müller, 2012, unpublished.
NOTE: The molecule has a sizable b dipole moment component of slightly more than 1 D. However, the corresponding transitions can not be predicted with confidence at present.

Lines Listed1484
Frequency / GHz< 1200
Max. J55
log STR0-6.0
log STR1-5.0
Isotope Corr.-0.0
Egy / cm–10.0
 µa / D2.28
 µb / D≠ 0
 µc / D 
 A / MHz∼634500.
 B / MHz11087.81
 C / MHz10881.72
 Q(300.0)6368.4308
 Q(225.0)4131.9775
 Q(150.0)2247.1648
 Q(75.00)794.3988
 Q(37.50)281.3420
 Q(18.75)100.3650
 Q(9.375)39.0638
 Q(5.000)19.7393
 Q(2.725)11.0317
detected in ISM/CSMno


Database maintained by Holger S. P. Müller and Sven Thorwirth, programming by D. Roth and F. Schloeder