Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1409634 | Journal of Molecular Structure | 2011 | 8 Pages |
Abstract
The FTIR and FT-Raman spectra of the first generation dendron built from the cyclotriphosphazene core, five arms OC6H4CHNN(CH3)P(S)< with 10 oxybenzaldehyde terminal groups and one ester function Gv1â² have been recorded. The structural optimization and normal mode analysis were performed for dendron on the basis of the density functional theory (DFT). The calculated geometrical parameters and harmonic vibrational frequencies are predicted in a good agreement with the experimental data. It was found that Gv1â² has a concave lens structure with planar OC6H4CHNN(CH3)P(S)< fragments and slightly non-planar cyclotriphosphazene core. The oxybenzaldehyde groups attached to different arms show significant deviations from a symmetrical arrangement relative to the local planes of repeating units. The experimental IR spectra of Gv1â² dendron was interpreted by means of potential energy distributions. Relying on DFT calculations a complete vibrational assignment is proposed. The strong band 1597 cmâ1 show marked changes of the optical density in dependence of the aldehyde (âСÐÐ), ester (âOСOâ) or azomethyne (âСÐNâ) substituents in the aromatic ring.
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Authors
V.L. Furer, I.I. Vandyukova, A.E. Vandyukov, S. Fuchs, J.P. Majoral, A.M. Caminade, V.I. Kovalenko,