The Fourier transform infrared FT-IR spectrometer and sample preparation

The Fourier transform infrared (FT-IR) spectrometer and sample preparation 

The IR region is from 20cm (far IR) to 14000 cm (near IR), but most laboratory IR spectrometers probe only the mid-IR (400 to 4000 cm ). In addition to being invaluable as a routine analytical tool in the laboratory, IR spectroscopy has applications in fields as far apart as forensic sciences (Fig. 4.11) and astronomy. The output data may be in the 

Ions such as [NOs] , [COa] , [804] and [C104] can coordinate to metal centres and, as a result, the symmetry of the anion is lowered. Structures 4.6-4.S illustrate common 

For example, N-H, O—H and C—H bonds all absorb around 3000-3600 cm (Table 4.1). However, if a compound containing C-H and N-H or O-H bonds is shaken with D2O, usually, only the OH and NH groups undergo rapid deuterium exchange reactions (eq. 4.7). An H atom attached directly to C exchanges extremely slowly except in cases where it is acidic (e.g. a terminal alkyne). 

By observing which IR spectroscopic bands shift (and by how much), it is possible to confirm the assignment of an N-H, O-H or C-H absorption. 

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