Summary
In the1H-n.m.r. spectra of (acetylacetonato)chloro-(η2-cyanoetheiie)platinum(II), the three protons of the ligand appear to be equivalent.13C-n.m.r., i.r. and further1H-n.m.r. studies indicate that the metal-ligand bonding is of orthodox π-olefin type (as formulated in the name of the compound above). The two 2-hydrogens are made equivalent by fluxion, but there is an accidental degeneracy with 1-hydrogen atom.
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Al-Najjar, I.M., Green, M. A remarkable accidental degeneracy in the1H-n.m.r. Spectrum of a (cyanoethene)platinum (II) complex. Transition Met Chem 3, 142–144 (1978). https://doi.org/10.1007/BF01393530
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DOI: https://doi.org/10.1007/BF01393530