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Topic: Structure of polymeric aluminum halides  (Read 4497 times)

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Offline Kran

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Structure of polymeric aluminum halides
« on: January 31, 2012, 09:45:23 PM »
Hi. I`m Kelvin from brazil. I`m training to the last IChO selection test. I`m stuck in one of the training problems:

Problem 2 - d)
http://www.icho2012.org/problems/preparatory-problems

Sketch a possible Lewis structure for [(C2H5)2AlF]x
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Offline UG

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Re: Structure of polymeric aluminum halides
« Reply #1 on: January 31, 2012, 09:57:14 PM »
Did you work out the value of 'x'? Is it a dimer?

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Edit: I got x as 4.
« Last Edit: January 31, 2012, 10:13:30 PM by UG »
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Offline Kran

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Re: Structure of polymeric aluminum halides
« Reply #2 on: February 01, 2012, 06:34:45 AM »
Lol, i thought i needed to provide a general structure. Yeah, i got x = 4 in c too.

I thought there must be Al - F - Al bridges, with Al-F half bonds. But i cant thing on what to do with the terminal Al. I can only imagine a circular (Al-F-)4 structure, with 2 CH3CH2- in each Al. But I`m not sure if entropy would let this happen.
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