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Topic: Can someone help explain the bonding in the compound NH3BF3?  (Read 14384 times)

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Offline fran008

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Can someone help explain the bonding in the compound NH3BF3?
« on: January 24, 2006, 04:28:13 PM »
Can someone help explain the bonding in the compound NH3BF3

Is B ionically boded to F? I mean the difference in electronegativity is big enough to consider it ionic, but then again, using Fajan's rules, B3+ is a small cation favouring some covalent character. Could it b possible that NH3 binds to N Covalently by a coordinate bond and bond to F ionically?

Any help greatly appreciated!
« Last Edit: January 24, 2006, 07:22:56 PM by Mitch »

Offline Mitch

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Re:NH3BF3
« Reply #1 on: January 24, 2006, 04:36:16 PM »
You wouldn't expect ionic bonding between non-metals.
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Offline plu

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Re:NH3BF3
« Reply #2 on: January 24, 2006, 06:44:12 PM »
The bonding in NH3BF3 is primarily covalent in nature.  The bond between the nitrogen and boron in this compound is a special type of covalent bond commonly known as a coordinate covalent bond or dative bond due to the fact that both electrons in the bond are coming from one of the molecules (the nitrogen).  This molecule is, in fact, a prime example of a Lewis acid-base reaction, where the NH3 is acting as a Lewis base, donating a pair of electrons to the BF3, which in turn accepts the electrons, acting as a Lewis acid.

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Re: Can someone help explain the bonding in the compound NH3BF3?
« Reply #3 on: January 29, 2006, 01:31:09 AM »
what plu said.

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