1. Dr. Geeta Tewari
Department of Chemistry
D. S. B. Campus
Kumaun University, Nainital
Email: geeta_k@rediffmail.com
Metal Alkene Complexes,
Preparation and Properties
CC BY-SA
19. Metal Olefinic Compounds Factors affecting C=C
bond length in M-olefinic complexes
Binding of metal lengthens the C=C bond length in M-
olefinic complexes
They are formed only by transition metal atoms, and
especially with those in which there are one or more filled
d orbitals available for donation to the p orbitals of the
carbon atom.
Become more stable as one descends a vertical transition
metal triad, e.g. Pt(II)> Pd(II)> Ni(II). however, Ag(I)
appears to be a better olefin acceptor than Cu(I) or Au(I)].
The oxidation state of a metal atom increases, ease of
complex formation with olefin decreases; thus Pt(II)
forms many olefin complexes whereas none of Pt(IV) are
known.
20. Metal Olefinic Compounds Factors affecting C=C
bond length in M-olefinic complexes
Binding of metal lengthens the C=C bond length in M-olefinic complexes