Complexes of N-thiophosphorylthioureas (HL) with copper(i). Crystal structures of [Cu3L3] and [Cu(PPh3)2L] chelates

Abstract

Reaction of the potassium salts of N-thiophosphorylated thioureas of common formula RC(S)NHP(S)(OiPr)₂ [R = morpholin-N-yl (HL^a), piperidin-N-yl (HL^b), NH₂ (HL^c), PhCH₂NH (HL^d)] with Cu(PPh₃)₃I in aqueous EtOH/CH₂Cl₂ leads to mononuclear [Cu(PPh₃)₂L–S,S′] complexes. Using copper(I) iodide instead of Cu(PPh₃)₃I, polynuclear complexes [Cu_n(L–S,S′)_n] were obtained. The structures of these compounds were investigated by ES-MS, elemental analyses, ¹H and ³¹P NMR in solution, IR and ³¹P solid-state MAS NMR spectroscopy. The crystal structures of [Cu₃L₃^a] and [Cu(PPh₃)₂L^b] were determined by single-crystal X-ray diffraction.