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The preparations of complexes of the type L2M(RC2R1) (where L = Ph,P, M = Ni, Pd, Pt, R = R' = CF,; L = Ph3P, M = Ni, Pt, R = R' = Ph, and R = Ph, R' = Me; L = Ph3P, M = Pd, Pt, R = R' = COOMe; and R = R' = CF3, M = Pd, Pt, L = n-Bu3P, Me2PhP) are described. From their nuclear magnetic resonance spectra these complexes appear to be approximately planar in solution.The vcGc observed in their infrared spectra indicate strong bonding of the acetylene to the metal.A new approach to the bonding in metal-acetylene complexes is proposed which can be extended to other n-complexes and which allows some predictions to be made.

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Rheniurn-(III), -( IV) , and -(v) .

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