• mercury(ii) complexes of new bidentate phosphorus ylides: synthesis, spectra and crystal structures

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 905
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     the reaction of dppm (1,1-bis(diphenylphosphino)methane) with 2-bromo-4-phenylacetophenone and benzyl bromoacetate in chloroform produces new phosphonium salts, [ph2pch2pph2ch2c(o) c6h4ph]br (i) and [ph2pch2pph2ch2cooch2ph]br (ii). by allowing the phosphonium salts to react with the appropriate base, the bidentate phosphorus ylides, ph2pch2pph2=c(h)c(o)c6h4ph (iii) and ph2pch2pph2=c(h)c(o)och2ph (iv), were obtained. the reaction of these ligands with mercury(ii) halides in dry methanol led to the formation of the mononuclear complexes {hgx2[(ph2pch2pph2c(h)c(o)c6h4ph)]} (x = cl (v); x = br (vi); x = i (vii)) and {hgx2[(ph2pch2pph2c(h)cooch2ph)]} (x = cl (viii); x = br (ix); x = i (x)). the ftir and 1h, 31p and13c nmr spectra were studied. the structure of compound iii was unequivocally determined by the single-crystal x-ray diffraction technique. single-crystal x-ray analysis of the {hgbr2[(ph2pch2pph2c(h)c(o)c6h4me)]} complex (xi) revealed the presence of a mononuclear complex containing the hg atom in a distorted tetrahedral environment. in all complexes, the ylides referred to above were coordinated through the ylidic carbon and the phosphine atom.

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