A series of complex, trans-PtCl 2 (olefin)(L) (L = a nitrogen or oxygen bonded ligand or Cl − , and olefin-cis-2-butene or a monosubstituted olefin), has been studied by infrared, Raman, UV and 13 C NMR spectroscopy. ... The trans-influence of L on the olefinic group is in the order of O < Cl − < N. This is reflected in a decrease of ν(Pt-C 2 ), in the summed percentage lowering of the coupled ν(C=C), δ(CH) and δ(CH 2 ) vibrations and in the increasing downfield δ ...
