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Vibrations of Free Molecules - 3. Forms of Vibration of Aromatic Rings in Melamin

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Vibrations of Free Molecules - Forms of Vibration of Aromatic Rings as in Melamin We will now look at some typical vibrations of a relatively large organic molecule, melamine. We shall only consider three skeletal or ring vibrations: the in-phase stretching vibration of the ring or ring-breathing, the in-plane ring deformation, and the out-of plane ring deformation. Here we see
the melamine molecule drawn in perspective: All the atoms lie in a plane. Both infrared and Raman spectra contain a large number of bands. One of the strongest Raman bands is due to the ring breathing vibration. As you can see all bands stretch and contract in phase: the molecule breathes. The vibrational amplitudes are now magnified by a factor
of 10. The in-plane ring
deformation also leads to a strong Raman band. You can see not only the large variations in the bond angles in the ring, but also
variations in the length of
the CN-bonds. The NH 2-groups move
only slightly. The out-of-plane ring
deformation shows a strong infrared band. All six Nitrogen atoms vibrate in one direction that is out of the plane of the molecule. All the remaining atoms move in the opposite direction. This leads to the generation of a dipole
moment perpendicular to the plane of the molecule. The polarity
of this dipole moment changes with the frequency of the vibration causing the infrared band to be very strong.
Cycloalkane
Sonnenschutzmittel
Molekülstruktur
Deformierung
Phasengleichgewicht
Raman-Effekt
Dipol <1,3->
Ordnungszahl
Stickstoff
Computeranimation
Hyperpolarisierung
Deformationsverhalten
Infrarotspektroskopie
Deformationsverhalten
Thermoformen
Melamin
Molekül
Aromatizität
Molekül

Metadaten

Formale Metadaten

Titel Vibrations of Free Molecules - 3. Forms of Vibration of Aromatic Rings in Melamin
Alternativer Titel Schwingungen freier Moleküle - 3. Schwingungsformen aromatischer Ringe in Melamin
Autor Schrader, Bernhard
Schneider, Richard
Lizenz CC-Namensnennung - keine kommerzielle Nutzung - keine Bearbeitung 3.0 Deutschland:
Sie dürfen das Werk bzw. den Inhalt in unveränderter Form zu jedem legalen und nicht-kommerziellen Zweck nutzen, vervielfältigen, verbreiten und öffentlich zugänglich machen, sofern Sie den Namen des Autors/Rechteinhabers in der von ihm festgelegten Weise nennen.
DOI 10.3203/IWF/C-1211eng
IWF-Signatur C 1211
Herausgeber IWF (Göttingen)
Erscheinungsjahr 1976
Sprache Englisch
Produzent IWF
Produktionsjahr 1975

Technische Metadaten

IWF-Filmdaten Film, 16 mm, LT, 43 m ; F, 4 min

Inhaltliche Metadaten

Fachgebiet Chemie
Abstract The movement of the atoms during the more important normal vibrations of melamine are shown in perspective representation: stretching and bending vibrations of the aromatic ring in the melamine molecule. The in-phase and out-of-phase movements as well as the concept of characteristic vibrations become clear in the process.
Schlagwörter molecular structure
oscillations / in molecules

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