Phosphine–borane derivatives. Part VII. The vibrational spectra of the phosphine adducts of boron trihalides

The i.r. and Raman spectra of PH3,BCl3, PD3,BCl3, PH3,BBr3, PD3,BBr3, PH3,BI3, and PD3,BI3 are reported. A normal co-ordinate analysis, utilizing a modified Urey–Bradley force field, confirms the assignments. All the adducts give best fits for a HPH angle of ca. 105–106°.