CHAPTER 16 - Organophosphorus Compounds

Abstract

Publisher Summary This chapter discusses the organophosphorus compounds, and PH and PH2 stretching vibrations that give rise to strong and sharp infrared (IR) and Raman bands in the region 2505–2222 cm−1. In the PH2 group, the antisymmetrical and symmetrical stretching bands are usually not resolved. There is a rough tendency for the PH stretching frequency to increase when there is an increase in the sum of the electronegativities of the substituents on the phosphorus. The PH2 has an HPH scissors bending or deformation vibration that gives rise to a band at 1090–1075 cm−1 in aliphatic and aromatic phosphines. This band is medium-strong in the IR and medium-weak in the Raman. The P=O stretching vibration gives rise to a strong band in the IR and a medium band in the Raman. The chapter describes the compounds containing P—NH2, P—NH—R, and P—NH—Ar have bands involving some P—Ν stretch bands.