N=N Vibrational Frequencies and Fragmentation Patterns of Substituted 1-Aryl-3,3-Dialkyl-Triazenes: Comparison with Other High-Nitrogen Compounds

$29.00 plus tax (Refund Policy)

Buy Article:

Abstract:

The influence of substitution pattern and electronic structure on the N=N stretching frequencies of compounds containing three to six linearly connected nitrogen atoms has been investigated by FT-IR and Raman spectroscopy. For a series of 1-phenyl-3,3-dialkyl-triazenes, Phe-N1=N2-N3 R2, shifts in the two valence vibrations of the triazeno group are studied with respect to the type and position of substituents at the aromatic ring, and for various alkyl substituents at N3. The N1=N2 stretching frequency is lowered by electron-withdrawing substituents at the aromatic ring; this effect is most pronounced for para-positioned substituents. A decrease in the N1=N2 bond order, and of the associated valence vibration, is also observed upon introduction of heavier N3-alkyl substituents, due to an inductive effect. Changes in vibrational frequencies are correlated with characteristic fragmentation patterns in the mass spectra of these compounds, where two degradation routes subsequent to ionization at the nitrogen atoms N1 and N2 have been observed. For the investigated pentazadiene derivatives, a weaker dependence of the N=N vibrational frequencies on the substituents is found. Mass spectra are interpreted in terms of two typical fragmentation pathways, involving a McLafferty rearrangement.

Keywords: Electronic structure; Mass spectroscopy; Raman spectroscopy; Triazene compounds

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702934415165

Affiliations: 1: Department of Physical Chemistry II, University of Bayreuth, D-95440 Bayreuth, Germany 2: Department of Organic Chemistry I, University of Bayreuth, D-95440 Bayreuth, Germany 3: Department of Macromolecular Chemistry I, University of Bayreuth, D-95440 Bayreuth, Germany 4: Institute of Technical Chemistry, Technical University of Munich, D-85748 Garching, Germany 5: Department of Physical Chemistry II, University of Bayreuth, D-95440 Bayreuth, Germany; complete address: Physical Chemistry II, University of Bayreuth, P.O. Box 101251, D-W-8580 Bayreuth, Germany

Publication date: July 1, 1993

More about this publication?
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more