Synthesis, Spectroscopic Study and Crystal Structure of a New Amidophosphonate, (C₆H₅O)₂P(O)(NHCH(CH₃)(C₂H₅))

Abstract

The crystal structure of diphenyl (2-butylamido) phosphonate has been determined. This crystal belongs to the space group P2₁/c, and the asymmetric unit of the structure is composed of one complete molecule. The P atom has a distorted tetrahedral configuration with the O–P–O angle as the minimum bond angle at the P atom (97.74(18)°) and one of the O=P–O angles as the maximum angle (115.2(2)°). The oxygen atom of the P–O–C₆H₅ moiety may be ascribed with the sp² character, reflected in the P–O–C angles (120.8(3)° and 125.4(3)°). In the crystal structure, the molecules are aggregated through the N–H···O=P hydrogen bond (N1···O1 = 2.971(5)Å) in a one-dimensional chain along the b axis.