FTIR wavenumber for Fe-N, Fe-O, and Fe-P?

In my research, I have Fe(III)-chitosan succinate, and then I added phosphate as a template (ion-imprinted polymer). I also have the FTIR spectra for both of them. But, I still have a doubt with which wavenumber/frequency to indicate that there are Fe-N, Fe-O, and Fe-P. Does anybody know about that?