Very briefly:
- vibrational energy of the molecules (depending on the number of atoms in the molecule an on the symmetry - not all vibrations are acive, there are also degenerate vibrations)
- based on certain empirical rules, tables, presence or absence of certain molecular functional groups
- with better tables effect os substituents, conjugation etc.
- molecular interactions (intra- or intermolecular)
- to some degree detection of the presence of impuritites, determination of composition (of simple mixtures)
- monitoring chemical transformation (e.g. oxidation or other reactions), kinetic analysis
- characterization of crystallinity in polymers
- orientation studies etc. etc.
Is FTIR peaks intensities and width are particle size and doing dependent
What kinds of details we can achieved for CdS nano-powder prepared by CdSO4+ammonia+thiourea+water reaction.
Very briefly:
- vibrational energy of the molecules (depending on the number of atoms in the molecule an on the symmetry - not all vibrations are acive, there are also degenerate vibrations)
- based on certain empirical rules, tables, presence or absence of certain molecular functional groups
- with better tables effect os substituents, conjugation etc.
- molecular interactions (intra- or intermolecular)
- to some degree detection of the presence of impuritites, determination of composition (of simple mixtures)
- monitoring chemical transformation (e.g. oxidation or other reactions), kinetic analysis
- characterization of crystallinity in polymers
- orientation studies etc. etc.
We can have both qualitative and quantitative data. In qualitative studies of the spectra we obtain the information on the presence of the specific functional groups such as CH2 CH3 amide olefinic etc and in the quantitative studies, by looking at their bandwidth frequency and area we can have information on the concentration of such groups in the sample. Thus, the concentration of DNA, RNA, proteins, lipids, triglycerides etc. Even with the neural network analysis we can find the protein secondary structure concentrations and the changes made to them.
FTIR or just IR will give you the different functional groups present in a compound as a result of the rotational, translational and stretching vibrations (which can be symmetric or asymmetric) from the bonds involved in the various functional groups. Signals at different frequency ranges will reveal what atoms in what bonds are present. But in your system, it will only reveal the C-N, C-H, N-H, C=S, OH from the thiourea and water. I do not know that Cd-S can be revealed by FTIR.
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