New organophosphorus ligands with SPNSO skeleton and their copper(I) complexes: Crystal and molecular structures of (SPPh 2)(O 2SPh)NH, [(Ph 3P) 2Cu{(SPPh 2)(O 2SMe)N}] and [(Ph 3P) 2Cu{(SPPh 2)(O 2SC 6H 4Me-4)N}] · 0.5C 6H 5CH 3

Abstract

The new phosphorus ligand (SPPh 2)(O 2SPh)NH ( 1) was prepared by reacting Li[HN(S)PPh 2] and PhSO 2Cl and was easily converted into its potassium salt, K[(SPPh 2)(O 2SPh)N] ( 2), by treatment with t-BuOK. Copper(I) complexes, [(Ph 3P) 2Cu{(SPPh 2)(O 2SR)N}] [R = Me ( 3), Ph ( 4), C 6H 4Me-4 ( 5)], were obtained from (Ph 3P) 2CuNO 3 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 · 0.5C 6H 5CH 3, 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 [(SPPh 2)(O 2SR)N] − ligands were found.