Zinc chloride as Lewis acid

  • #1

Main Question or Discussion Point

Zinc chloride is Electrophilic and so acts as a Lewis acid.This characteristic is due to it's ability to accept electrons to it's 4 d orbital.My question is why it receives electrons to it's 4 d orbital when 4 p remain empty( according to Aufbau diagram)?Are there any other d block element capable of accepting electrons to 4 d orbital leaving 4 p and 5 s orbitals ?
 

Answers and Replies

  • #2
TeethWhitener
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This characteristic is due to it's ability to accept electrons to it's 4 d orbital.
Says who? This should be 3d.

edit: 4s, not 3d.
 
  • #3
According to the configuration of zinc it is [Ar]3 d^ 10,4 s^2.As such there is no room for fresh electrons to enter 3 d .So the next option is 4 p. could you make this clear?
 
  • #4
TeethWhitener
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What is the electron configuration of zinc in ZnCl2? Hint: it’s not what you’ve written.
 
  • #5
chemisttree
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What is the electron configuration of zinc in ZnCl2? Hint: it’s not what you’ve written.
Beat me to it! 👍🏻
 
  • #6
I am stuck here.Please help.
 
  • #7
chemisttree
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You have written the electronic configuration for neutral zinc. In the compound zinc chloride, is zinc neutral?
 
  • #8
I agree that in Zn Cl 2 Zn is not neutral.It has donated electrons to chlorine forming Zn ion. I am appending a post from internet which mentions about 4 d orbital which I referred initially:-
The basic characteristics of a Lewis Acid is property of gaining electron

In ZnCl2 Electronic configuration of zinc is 3d ^10 so it has a tendency to accept electrons in its empty 4d orbitals so it act as Lewis acid

I hope this helps.
 
  • #9
TeethWhitener
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In ZnCl2 Electronic configuration of zinc is 3d ^10 so it has a tendency to accept electrons in its empty 4d orbitals so it act as Lewis acid
No, the 4d orbitals are way too high in energy to accept electrons. The zinc in ZnCl2 is Zn2+. If the electronic configuration of neutral zinc is [Ar]4s23d10 and in Zn2+ is [Ar]3d10, what orbital in Zn2+ do you think will accept electrons?
 
  • #10
Thank you for your reply.As a Lewis acid it will accept extra electrons and I feel electrons will enter 4 p orbitals.I don't whether I am right.Please enlighten me.
 
  • #11
TeethWhitener
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Let’s try again: neutral zinc is [Ar]4s23d10 and Zn2+ is [Ar]3d10. If Zn2+ accepts an electron pair as a Lewis acid, which orbital will the electrons go into?
 
  • #12
As I wrote to you earlier the electrons should enter the empty 4 p orbital.Am I right?
 
Last edited:
  • #13
chemisttree
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No you aren’t. From your Aufbau diagram, which electrons fill after 3d10?
 
  • #14
According to aufbau diagram the next orbital to be filled is 4 p and then 5 s
 
  • #15
TeethWhitener
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Let’s try this the other way. If you start with neutral zinc [Ar]4s23d10 and you lose two electrons to get Zn2+ [Ar]3d10, which orbital became empty after the loss of the two electrons?
 
  • #16
chemisttree
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According to aufbau diagram the next orbital to be filled is 4 p and then 5 s
Right. So you agree that 4p is higher energy than 4s? Both are empty in Zn+2.
 
  • #17
Still I am unable to know which orbital fresh electrons going to fill after 3 d in Zn+2
 
  • #18
TeethWhitener
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Still I am unable to know which orbital fresh electrons going to fill after 3 d in Zn+2
Start by answering my question in post 15.
 
  • #19
According to your post 15 the 4 s orbital is empty after loss of two electrons
 
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  • #20
TeethWhitener
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According to your post 15 the 4 s orbital is empty after loss of two electrons
Ok so now read @chemisttree 's post 16. What is the lowest energy empty orbital in Zn2+?
 
  • #21
According to post 16 of chemisttree lowest empty orbital is 4 s in Zn+2
 
  • #22
TeethWhitener
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According to post 16 of chemisttree lowest empty orbital is 4 s in Zn+2
Ok so according to Aufbau, which orbital in Zn2+ gets filled first?
 
  • #23
So according to aubau diagram 4 p is going to be filled first
 
  • #24
TeethWhitener
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So according to aubau diagram 4 p is going to be filled first
What is the Aufbau principle, in your own words?
 
  • #25
chemisttree
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What is the Aufbau principle, in your own words?
I think Hari has it now. We should let this info stew for a while until Hari has the epiphany I know is coming. Anything further is just trolling...
 

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