There are several short introductions available on the Internet. The best thing is to look for publications on structures close to your expected structures and to read the interpretation. In this way you can accumulate an own spectrum library. If you wish, attach the diagram.

Dear Gyorgy Banhegyi, thank you for care to answer me .

Are you have a good link?

If a link is good or not depends on your background and your knowledge about IR.

Here are some possible helpful links.

But all are very general, if you have a specific problem they probably do not help.

http://www.rsc.org/learn-chemistry/wiki/Introduction_to_IR_spectroscopy

http://www.chemguide.co.uk/analysis/irmenu.html#top

https://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/Spectrpy/InfraRed/infrared.htm

http://www.rsc.org/learn-chemistry/collections/spectroscopy/introduction#IRSpectroscopy

Dear Thomas Simons, many thanks

Please find attached some files

Dear Gyorgy Banhegyi, many thanks