Overtone spectroscopy of some benzaldehyde derivatives |
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Authors: | PK Srivastava DK Rai SB Rai |
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Institution: | (1) Laser and Spectroscopy Laboratory, Department of Physics, Banaras Hindu University, 221 005 Varanasi, India |
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Abstract: | Overtone spectrum of o, m and p-nitrobenzaldehydes and p-chlorobenzaldehyde has been studied in 2000–12000 cm−1 region. Vibrational frequencies and anharmonicity constants for aryl as well as alkyl CH stretch vibrations have been determined.
We have also determined the internuclear distances for the aryl CH bond in the different molecules. The small variation observed
in these distances is an indication of the substitution effect.
It is observed that in the case of p-disubstituted benzens, the shift in aryl CH bond is proportional to sum of the Hammet σ of the substituents. However in the
case of o-disubstituted benzenes it is only 80% of the para-substituted shift. |
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Keywords: | Overtone spectroscopy aryl CH alkyl CH Hammet σ inductive effect |
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