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Topic: reaction of SiCl4 with Si-H  (Read 2904 times)

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Offline txprof

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reaction of SiCl4 with Si-H
« on: July 20, 2018, 10:31:11 AM »
I am trying to figure out whether SiCl4 will react with an Si-H bond spontaneously. Anyone have any advice of resources/literature that can help me?

Offline Phalcone42

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Re: reaction of SiCl4 with Si-H
« Reply #1 on: July 20, 2018, 11:01:09 AM »
Perhaps a simple start would be to look at the bond energies of the Si-H, Si-Cl, Si-Si, and H-Cl bonds and do simple summations. (Hint: sum of products - sum of reactants)
http://www.wiredchemist.com/chemistry/data/bond_energies_lengths.html

This should at least give the theoretical spontaneity, but there are often many effects which can impeded the theoretical.

Offline Enthalpy

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Re: reaction of SiCl4 with Si-H
« Reply #2 on: July 23, 2018, 05:02:08 AM »
One aspect is that the reaction releases good heat. Good first check.

This doesn't suffice for a reaction to start spontaneously (if this is what you mean, because "spontaneous" has a special meaning in chemistry). For instance a forest burning in the atmosphere releases heat, but it needs a cause to catch fire.

SiH4 starts many reactions spontaneously, for instance it catches fire in the atmosphere at or just above room temperature.

Telling why is more tricky. It needs to find a reaction path where all the energy hurdles are low, and for that, many species must be considered and combined, including free radicals. The weak Si-H bond eases such reaction paths.

Offline yuehuizhou

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Re: reaction of SiCl4 with Si-H
« Reply #3 on: August 21, 2018, 04:59:13 PM »
It will form a mixed structure from SiCl4 and SiH4 --> 2 SiH2Cl2.

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