A series of potential chelate agents of the sulfonylamide type with the general formula RSO2NHPO(R1)2, where R = -C6H5, R1 = -OCH3 (<$E roman HL sup 1>), -OCH2C6H5 (<$E roman HL sup 2>), -OC6H4CH3~-~p (<$E roman HL sup 3>), -O(CH2)2OCH3 (<$E roman HL sup 4>), -N(CH3)C6H5 (<$E roman HL sup 5>), -N(CH3)CH2C6H5 (<$E roman HL sup 6>), and their sodium salts are synthesized and characterized by IR- and <$E ~ sup 1 roman H>, <$E ~ sup 31 roman P> NMR-spectroscopies. For the ligands <$E roman HL sup 1> and <$E roman HL sup 3>, the dimeric and polymeric structures are established using the X-ray diffraction analysis.