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INORGANIC CHEMISTRY QUESTION

IR Questions

1. Why do the CO stretches occur in a much higher frequency region than C=O stretches in organic carbonyl compounds?

2.Why do Metal-Hydride stretches occur at much lower frequency than C-H stretches?

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Irving Heathcote
Irving HeathcoteLv2
28 Sep 2019

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Related questions


Question 2:

a) What is the normal distance (in bonds) for coupling to occur in 1H NMR?

b) We do not see coupling between carbons in a 13C NMR. Why?

c) The Y-axis of an IR spectrum is % transmission. What is the unit seen on the X-axis in IR spectra? Is this value frequency or wavelength?

d) In IR spectroscopy scissoring and wagging and bending of C-H bonds is more likely to be seen in the functional group region or the fingerprint region?

e) Look up the IR Values for amide and ketone carbonyls. What do the differences of the amide C=O IR values relative to the ketone C=O values suggest?

f) When an organic molecule absorbs Ultraviolet light, what sort of transition happens?

g) Which is higher in energy? Ultraviolet light or visible light?

Explain why C-H single bond stretching is observed in the functional group (higher energy) region of the IR, but the absorptions corresponding to other C-O or C-halogen single bond stretching vibrations are in the finger print region at significantly lower frequency.

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