Synthesis and Multinuclear NMR Study of Novel Complexes of Zn(II) and Hg(II) Containing Phosphorus Ylides

Abstract

Reaction of phosphorus ylides of the type R-COCH = PPh₃ (R = C₆H₅C₆H₄ (1a) and C₁₀H₇ (1b)), with M(NO₃)₂.nH₂O (M = Hg(II), n = 1 and Zn(II)), n = 6) in equimolar ratios using methanol as solvent are reported. The analytical data, IR, ¹H, ¹³C and ³¹P NMR indicate a 1:1 stoichiometry between the ylides and M(II) nitrate [M = Zn(II) or Hg(II)] in each of new polymeric complexes of the type {Hg[(R-COCH = PPh₃)(μ-NO₃)(NO₃)]}n. (DMSO)n (R = C₆H₅C₆H₄ (2a), C₁₀H₇ (2b)) and {Zn[(R-COCH = PPh₃)(μ-NO₃)(NO₃)]}n.(DMSO)n (R = C₆H₅C₆H₄ (3a), C₁₀H₇ (3b)). Also, reaction of ylides with ZnCl₂ in equimolar ratios, gave novel binuclear complexes of the type [(R-COCH = PPh₃).ZnCl₂]₂ (R = C₆H₅C₆H₄ (4a), C₁₀H₇ (4b)). Variation of temperature in a ³¹P NMR study for complex 2a indicates that the disappearance of satellites, due to coupling to ¹⁹⁹Hg, occurs with increasing temperature.