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Abstract
The reactions of phosphonium salt, [PPh 2CH 2PPh 2CH 2C(O)Ph]Br with Hg(II) halides in methanol formed the zwitterionic products with the composition [HgCl 2(Br)( PPh 2CH 2PPh 2CH 2C(O)Ph)] ( 2), [HgBr 3( PPh 2CH 2PPh 2CH 2C(O)Ph)] ( 3), [HgBr 2(I)( PPh 2CH 2PPh 2CH 2C(O)Ph)] ( 4). A product of composition, [HgCl 3( PPh 2CH 2PPh 2CH 2C(O)Ph)] ( 5) was obtained when the ylide, Ph 2PCH 2PPh 2 CHC(O)Ph was treated with HgCl 2 in CH 2Cl 2 and crystallized under aerobic conditions. The complexes were characterized by elemental analysis, IR, 1H, 31P NMR spectra and also by X-ray crystallography. The absence of significant coordination chemical shifts in the 31P NMR spectra indicates the presence of formal negative charge on mercury. The single crystal X-ray structures confirm the presence of Hg–P bond and also reveal a distorted tetrahedral geometry around the mercury atom in all the structures.
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