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Origin of bond rotation barrier in ethane.

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http://en.wikipedia.org/wiki/Bond_rotation_barrier

The origin of the bond roatation barrier with ethane is a problem that many people have puzzeled over. Let me try to work it out!

If you were to observe the hydrogen atoms in ethane, then you will see that they either get along in a polarised fashion, or they elapse. If you were to add three of these together, you could have them elapsing and polarised at the same time, then they could be doing both 'jobs' at once.

The origins of the bond rotation barrier comes from the cells pushing until they cannot resist anymore. Think of magnets that push away from each other until you hover them so close they do not slip this way or that? That calls for balance in the administration of energy on each magnet, yes?

Are they magnetic? They both are gas based, like petrol, but maybe even these are magnetic? If you were to try to push one tip right next to the other, letting the other two repel each other, then maybe that will work? this will leave the pyramid shape of the hydrogen atoms as they equally push the other two , but allow for one to be 'touching'.

If they push like that, then they obviously bear a charge! The charge could be like fire and water, but, they are both the same! This means they need to be placed together with other hydrogen atoms to make them repel each other into new spaces. If they do repel each other, then grouping them together with other polarised atoms would allow for greater flexibility, yes?
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  1. HoleyCarbonGrid's Avatar
    Huh?

    Bond rotation barrier in ethane comes from steric bulk (Steric effects - Wikipedia, the free encyclopedia). In other words, there are generally two conformations accessible to ethane - eclipsed (wherein the hydrogen atoms attached to each carbonyl are 'lined up' with each other in a Newman projection) and gauche - or staggered - (wherein the hydrogen atoms are as far apart as possible in a Newman projection).

    The eclipsed conformation leads to overlap of the electron clouds (sp3 hybridized orbitals on each carbon atom) being closer to one another. Due to the negatively charged nature of electrons, this conformation is energetically less favorable than when they are as far apart as possible (the gauche conformation). Hence the barrier to bond rotation.

    Ethane Conformations - YouTube

    This hasn't really been puzzling to anyone since the mid 20th century. Such steric clashes, and the resulting conformation preferences, are now at the root of our understanding of chemistry - particularly for organic compounds.
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