The Reaction Products between Phosphoric Triamide and Some Transition Metal Chlorides in Absolute Methanol

Abstract

The reactions between phosphoric triamide and anhydrous MCl2 {M=Mn (II), Co (II), Cu (II), Zn (II), (as trace nutrients) or Cd (II) } in methanol were studied, and the products were examined by chemical analysis, X-ray powder diffraction method and IR spectroscopy, etc. New complexes, [M (PO (NH₂) 3) 2]Cl2 (1), were formed in the reaction of PO (NH₂) 8 with Mn (II) and Co (II) chlorides, and [Cd (PO (NH₂)8) Cl2] (2) with Cd (II) chloride. On the other hand, in the reaction with Cu (II) chloride, PO (NH₂), was obviously decomposed, giving Cu, (NH₂), Clex H₂O, Cu (NF18) 2Cl2 and a small amount of NII4Cl. An oily substance, of which the chief product seemed to be a Zn complex of PO (1\11-12) 8, was produced in the reaction with Zn(11) chloride.
Both the isolated complexes (1) and (2) are hygroscopic crystalline powders, soluble in water and methanol but insoluble in various organic solvent.
Their IR spectra and conductivities suggest that (1) is 6-coordinate complex, in which PO (NH, ), is bound to Mn (II) or Co (II) as a terdentate ligand through the N atom of amide, and that C_2Cj is complex, in which PO(NH₂), is bound to Cd(11) as a bidentate ligand through both the phosphoryl O atom and N atom of amide.
Finally, it was found that these complexes are less hygroscopic than PO(NH).