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Topic: Transition metal organometallics and the 18th rule  (Read 3674 times)

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Offline Bibinou

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Transition metal organometallics and the 18th rule
« on: October 14, 2006, 06:55:03 AM »
Hello everybody,

I have some problems in order to count the electrons in compound using the 18th electrons rule.

In the compound [(BuO)3 Mo Mo (OBu)3] I count 12 electrons (6 e- for Mo, 3 * 1e- for Metal-Metal bound, and 3 * 1e- for OBu). Is it correct?

In the compound W(CO)3(P Pr3)2(H2) I count 16 electrons (6 e- for W, 3 * 2e- for CO and 2*2e- for P Pr3). Is it correct?

Moreover, it exist exceptions to the 18-electron rule.
Why cannot V(CO)6 dimerize?
What about the compound Mo2(OSiMe3)6 and W(Me6)?

Why are Metallocenes [M (C5H5)2] are only known for M = V to Ni ?

I thank you very much for your help

Offline Morphic flip

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Re: Transition metal organometallics and the 18th rule
« Reply #1 on: October 15, 2006, 07:07:20 AM »
1st Complex:
How do you mean 3 * 1e- for Metal-Metal bound?
What is element Bu?

2nd Complex:
Doesn`t each hydrogen gives 1 electron.

V(CO)6 doesn`t dimerize because of steric hindrance from another V(CO)6

Why are Metallocenes [M (C5H5)2] are only known for M = V to Ni, I thought Sc and Ti where unstable.


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