Factors Influencing the Static Modes

From the molecular orbital standpoint, ir-bonding ligands (L,) that are trans to the ligand of interest (L2) stabilize filled and partially filled metal d-orbitals that might otherwise interact with w-orbitals of the appropriate 

The instability of 7r,7r complexes is evidenced by the rapid isomerization of rran5-(h -C2H4)2PtCl2 to the cis isomer (5) (Fig. 4). 

Most 0--7T rearrangement reactions are initiated in one of two ways— reaction of the metal center or reaction on the ligand itself. However, some molecules are fluxional, requiring no chemical promotion for rearrangement. 

When cr-allyl complexes of h -cyclopentadienyltricarbonylmolyb-denum (10) and tungsten (//) are irradiated with ultraviolet light, a (t-tt 

A similar rearrangement is observed with allyl complexes of cobalt cyanides (12). 

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