Abstract
The variable-temperature 1H and 19F n.m.r. spectra of cis-cis-trans-[PtX2(C6F5)2(PEt3)2] and mer-trans- and mer-cis-[PtX3(C6F5)(PEt3)2](X = Cl or Br) have been investigated. It is concluded that, at low temperatures, the rotation of the phosphine ligands is prevented by steric interaction with cis-pentafluorophenyl groups. Values of δp, δpt, 2J(PP), and 1J(PtP) from heteronuclear INDOR measurements are reported.
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