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level: Level 3

Questions and Answers List

Question	Answer
IR Instruments: FOR QUALITATIVE IDENTIFICATION	1 Dispersive spectrometers 2 Fourier-transform (FTIR)
uses MONOCHROMATOR to select each wavenumber to MONITOR INTENSITY after passing thru sample	Dispersive spectrometers
uses INTERFEROMETER - generates radiation WITHOUT dispersion, faster, xtract the spectrum from a series of overlapping frequencies.	Fourier-transform (FTIR)
IR Instruments: FOR QUANTITATIVE IDENTIFICATION	1. Filter photometer
THEORY In order for IR radiation to be absorbed by a molecule: 1. Molecule should possess a __ frequency identical to that of impinging EM radiation	vibrational or rotational
Types of Molecular vibrations:	1 Stretching 2 Bending (deformation)
1 distance increase or decreases along BOND AXIS 2 in which BOND ANGLES occurs	1 Stretching 2 Bending (deformation)
1 in plane stretching movements 2 in plane bending movements 3 out of plane bending movements	1 Asymmetric, Symmetric 2 Scissoring, Rocking 3 twisting, wagging
Application of IR spectrophotometry in STRUCTURE ELUCIDATION 1 Pharmaceutical analysis it is a __ technique 2 The most readily assigned absorptions are usually at	. 1 fingerprint 2) > 1500 cm-1