A new amidophosphoester, (4-Cl-C6H4O)(OC4H8N)2PO, was synthesized and characterized by spectroscopic methods (IR, 31P-, 13C-, 1H-NMR) and single-crystal X-ray diffraction. The crystal belongs to the space group P21/c, and the asymmetric unit of structure is composed of one complete molecule. The P atom has a distorted tetrahedral (O)(N)2P(O) environment with one of the O═P—N angles as the maximum angle at the P atom and one of the O—P—N angles as the minimum angle. The oxygen atom of the P—O—C6H4-4-Cl part may be ascribed with the hybridization including a few more “s” character with respect to “sp2”, reflected in the P—O—C angle (127°). In the crystal, the molecules are aggregated through CH…O hydrogen bonds forming a two-dimensional array along the bc plane.

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