# Where can I find the infrared band positions for phosphorus compounds?

I am trying to interpret an IR spectrum where I have $\ce{(NPCl2)3}$

I have $\ce{P-N}$, $\ce{P=N}$ and $\ce{P-Cl}$ bonds and it is cyclic.

Where can I find or does anyone know what the general ranges for these stretches are?

I found a website that told me $\ce{P=N}$ is around $1170 \, \mathrm{cm}^{-1}$.

There is also another comment on $\ce{P-Cl}$ bands:
Compounds containing the $\ce{P-Cl}$ bond have a medium-to-strong absorption at $605 - 435$ $\mathrm{cm}^{-1}$ due to the $\ce{P-Cl}$ stretching vibration. The position of the band due to the $\ce{P-X}$ ($\ce{X}$=$\ce{F}$ or $\ce{Cl}$) stretching vibration is affected by the oxidation state of the phosphorus atom. 'In the presence of more than one halogen atom directly attached to the phosphorus atom, two peaks are observed due to the asymmetric and symmetric stretching vibrations respectively. Difluorides of the type $\ce{-P(O)F2}$ absorb at $930-895$ $\mathrm{cm}^{-1}$ and $890-870$ $\mathrm{cm}^{-1}$