New organophosphorus ligands with SPNSO skeleton and their copper(I) complexes: Crystal and molecular structures of (SPPh2)(O2SPh)NH, [(Ph3P)2Cu{(SPPh2)(O2SMe)N}] and [(Ph3P)2Cu{(SPPh2)(O2SC6H4Me-4)N}] · 0.5C6H5CH3

The new phosphorus ligand (SPPh2)(O2SPh)NH (1) was prepared by reacting Li[HN(S)PPh2] and PhSO2Cl and was easily converted into its potassium salt, K[(SPPh2)(O2SPh)N] (2), by treatment with t-BuOK. Copper(I) complexes, [(Ph3P)2Cu{(SPPh2)(O2SR)N}] [R = Me (3), Ph (4), C6H4Me-4 (5)], were obtained from (Ph3P)2CuNO3 and the potassium salt of the corresponding acid in a 1:1 molar ratio. All compounds were characterized by multinuclear (1H, 13C, 31P) NMR spectroscopy. The molecular structures of the free acid 1, as well as of complexes 3 and 5 · 0.5C6H5CH3, were established by single-crystal X-ray diffraction. The acidic proton in 1 is attached to nitrogen and the molecular units are associated through intermolecular S = O⋯H–N hydrogen bonding [H⋯O 2.098 Å], resulting in dimeric units. For the copper complexes, monomeric structures with bidentate [(SPPh2)(O2SR)N]− ligands were found.