Correlation between NMR coupling constants and molecular structure. Synthesis and phosphorus-31 NMR measurements of [HgX2(cis-Ph2PCH:CHPPh2)] and x-ray crystal structures of [HgBr2(cis-Ph2PCH:CHPPh2)], [Hg(NO3)2(PPh3)2], and [Hg(CN)2(PPh3)2]

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