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Issue 44, 2009
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Infrared signatures of the NCCO radical

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The first definitive infrared signatures of the elusive NCCO radical have been measured using a microwave discharge technique combined with low-temperature matrix-isolation spectroscopy, resulting in a consistent set of vibrational assignments for six isotopologues. The infrared spectra of these NCCO isotopologues were concomitantly established by rigorous variational nuclear-motion computations based on a high-level coupled-cluster quartic vibrational force field [ROCCSD(T)/cc-pCVQZ] and cubic dipole field [ROCCSD/cc-pCVTZ]. Our experimental and theoretical results for NCCO overturn the vibrational assignments in a NIST-JANAF compilation and those from a recent two-dimensional cross-spectral correlation analysis. For the parent isotopologue at 11 K in a nitrogen matrix, we find the signature bands ν2(CO str.) = 1889.2 cm−1 and ν3(CC str.) = 782.0 cm−1. Our variational vibrational computations reveal strong mixing of the ν3 stretching fundamental and the ν4 + ν5 bending combination level for all isotopologues. These Fermi resonances manifest a clear breakdown of the simple normal-mode picture of molecular vibrations at low energies.

Graphical abstract: Infrared signatures of the NCCO radical

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Article information

29 Jun 2009
11 Aug 2009
First published
28 Sep 2009

Phys. Chem. Chem. Phys., 2009,11, 10385-10390
Article type

Infrared signatures of the NCCO radical

P. R. Schreiner, H. P. Reisenauer, E. Mátyus, A. G. Császár, A. Siddiqi, A. C. Simmonett and W. D. Allen, Phys. Chem. Chem. Phys., 2009, 11, 10385
DOI: 10.1039/B912803D

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