Diastereoisomers
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6. Four possible structures are shown below for the complex trans-{ML4(n^2-C2H4)2}. L is a neutral 2 electron sigma only donor. The notation 'n^2-C2H4' means that the ethylene is bonded to the metal such that both carbon atoms are interacting simultaneously with the metal atom. When M is a low-spin, d6 metal, which of the four diastereoisomers shown below is likely to be the lowest energy and why? Your answer should include an explicit description of all ligand orbital-metal orbital interactions, including the precise metal orbits that are involved
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Solution Summary
Ligand orbital for diastereoisomers are given.
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Structure C seems to have the lowest energy. Here is the explanation for that:
This is a case of π-backbonding. Bonding of π-conjugated ligands (here C2H4 or ethylene) to a transition metal (here low spin d6 metal i.e. all t2g orbitals filled and all eg orbitals empty) involves a synergic process with donation of electrons from the filled π-orbital of ligand into an empty orbital of the metal ...
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- "Thankyou for the feedback. I have a few question though; With the first statistic about cost below... “According to Sigma-Aldrich catalog, cost of 1L octane is AUD $ 392.00, whereas the cost of 1L ethanol is AUD $196.00. Moreover, if ethanol is obtained from sugar industry as a by-product, it may cost even less. Source of oxygen is ambient atmosphere, so it costs nothing. So ethanol is much cheaper than petrol, in fact it is half-priced: AUD $ (392-196) = $ 196.” I didn't think it made sense because the cost of petrol per litre is normally a dollar something or even less than a dollar not a couple of hundred of dollars. For example, a statistic that I found in america was: "U.S. ethanol production costs are about $1.20 per gallon of ethanol, or $1.82 per gallon on a gasoline-equivalent basis." However, I was wondering whether you could find an Australian statistic. Also, you mentioned that H20 is not a greenhouse gas. However, in the combustion equations it is actually carbon dioxide and water vapour which are produced and they are both greenhouse gases. Finally, how do I calculate the energy efficiency of ethanol and petrol? "
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