Carbacylamidophosphates: Structure and Properties of Bis(N,N′,-morpholido)-[(N″-morpholido)-carboxamido] phosphate

The bis(N,N′-morpholido)-[(N″-morpholido)-carboxamido] phosphate: O(CH₂CH₂)NC(O)-N(H)P(O)[N(CH₂CH₂)O]₂ [HL], has been prepared and characterized by means of IR, ³¹P and ¹H NMR spectroscopy and X-ray diffraction (triclinic, a = 9.282(2), b = 9.308(2), c = 21.341(4) A, α = 80.79(3)°, β = 80.92(3)° γ = 66.92(3)°, V = 1665.1(6) A³, space group P1, Z = 4 and R = 0.0423, wR2 = 0.1303 for 6774 unique reflections used). The unit cell consists of two independent molecules connected by hydrogen bonds N-H...O=P into non-symmetric dimers. The compound behaves as a HL molecule with a protonation constant corresponding to the -C(O)N(H)P(O)- group of pK = 8.65 as determined by potentiometric studies.