Phosphoryl donor (PO) ligands (tBuNH) 3PO (1),(C6H5CH2NH) 3PO (2) and (4-NO2– C6H4C (O) NH)(OC4H8N) 2PO (3) were used for the preparation of new organotin (IV) complexes Cl2Me2Sn (PO) 2 (4–6). The environment at the nitrogen atom in the phosphoramide ligand is almost planar and it does not take part in hydrogen bonding as an acceptor in complexes 4–6, reflecting its low Lewis base character, and the Sn atom is ...