Inorganic Chemistry - Predicting Bond-strength of Metal Carbonyls - Chemistry Stack Exchange
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sign up log in tour help Take the 2-minute tour × Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers and students. It's 100% free, no registration required. Predicting bond-strength of metal carbonyls The metal carbonyls (and similar organometallic compounds) involve a combination of sigma bond, a pi bond and backbonding. The bond strengths under consideration are the metal-carbon bond and the carbon oxygen bond. Here is the original question:- Predict the order of bond strength in the following:- I) II) III) All of these are isoelectronic, and hence whatever the difference of bond strengths, must arise from the difference in the resultant nuclear force of attraction. Since has the highest charge density, I would assume that the bond strength of the manganese compound is the strongest (vanadium being the weakest) and therefore, the bond strength must follow the opposite order, as the strengthening of the metal carbonyl bond should weaken the carbon oxygen bond. But the answer given is , exactly the opposite of my prediction. A relevant factor which I didn't consider is the back bonding, but I am unsure of how to integrate that into my prediction. Also, III<II<I Why is it so? how would we make a prediction if the given compounds were not isoelectronic? inorganic-chemistry bond coordination-compounds quantum-chemistry organometallic-compounds asked Feb 5 at 16:58 Satwik Pasani 2,345 1 5 27 1 Answer As the π-antibonding orbital of CO is filled by electrons from the metal, they weaken the C-O bond compared with free CO. The metal-carbon bond is strengthened in kind. That's what the books says. answered Feb 6 at 2:09 Uncle Al 5,173 2 10 – Considering that, how can we predict the order of bond-strength? Satwik Pasani Feb 19 at 8:01
Inorganic Chemistry - Predicting Bond-strength of Metal Carbonyls - Chemistry Stack Exchange
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Predicting bond-strength of metal carbonyls
The metal carbonyls (and similar organometallic compounds)
involve a combination of sigma bond, a pi bond and backbonding. The
bondstrengths under consideration are the metal-carbon bond and the
carbon oxygen bond. Here is the original question:-
Predict the order of bond strength in the following:-
$0
I)
II) $0
III)
All of these are isoelectronic, and hence whatever the
difference of bond strengths, must arise from the difference in the
resultant nuclearforce of attraction. Since has the highest charge
density, I would assume that the bond strength of the manganese
compound isthe strongest (vanadium being the weakest) and
therefore, the bond strength must follow the opposite order, as the
strengthening ofthe metal carbonyl bond should weaken the carbon
oxygen bond.
.O
.$
$0
But the answer given is , exactly the opposite of my prediction.
A relevant factor which I didn't consider is the backbonding, but I
am unsure of how to integrate that into my prediction. Also,
