Water in Coordination Compounds

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TheresaDsilva4A
Posts: 53
Joined: Thu Jul 25, 2019 12:17 am

Water in Coordination Compounds

Postby TheresaDsilva4A » Sun Dec 01, 2019 2:08 pm

When I was looking through the solution manual, I noticed that water was often written as OH2 instead of H2O in the formulas of coordination compounds. Can someone explain why this is the case? Will we be penalized on an exam if we write it one way as opposed to the other? Thank you so much!

Trinity Vu 1D
Posts: 53
Joined: Fri Aug 30, 2019 12:15 am

Re: Water in Coordination Compounds

Postby Trinity Vu 1D » Sun Dec 01, 2019 2:21 pm

Its written as OH2 because depending on the location of the molecule when it is acting as a ligand, the position of the water molecule changes. When a water molecule is a ligand on the right side of the central transition metal atom, the O is what bonds to the central atom, not the H2. Therefore, when drawing lewis structures, the O is written before the H2. ie [SnCl4(OH2)2]

Norman Dis4C
Posts: 101
Joined: Sat Sep 28, 2019 12:16 am

Re: Water in Coordination Compounds

Postby Norman Dis4C » Sun Dec 01, 2019 2:23 pm

The atom that is linked to the metal atom is often written first to emphasize the bonding sites. You could also underline the bonding atom to indicate.

cassidysong 1K
Posts: 100
Joined: Fri Aug 30, 2019 12:15 am

Re: Water in Coordination Compounds

Postby cassidysong 1K » Sun Dec 01, 2019 9:15 pm

Its just to emphasize that it's the oxygen bonding to the compound.

Jordan Ziegler 2J
Posts: 59
Joined: Sat Aug 17, 2019 12:15 am

Re: Water in Coordination Compounds

Postby Jordan Ziegler 2J » Sun Dec 01, 2019 10:10 pm

When writing the formula for the coordination compound (as opposed to simply stating what the ligand is or drawing the lewis structure), should water be written as H2O or OH2?

saigorijavolu2k
Posts: 108
Joined: Sat Sep 28, 2019 12:15 am

Re: Water in Coordination Compounds

Postby saigorijavolu2k » Sun Dec 01, 2019 10:12 pm

Usually in coordination compounds, the H20 becomes OH2. Since this is what bonds to the transition metal. I am not sure if we will be penalized for this.

emaad_3H
Posts: 51
Joined: Thu Jul 11, 2019 12:17 am

Re: Water in Coordination Compounds

Postby emaad_3H » Sun Dec 01, 2019 11:43 pm

It's just so you know that the oxygen is what is bonded and not the hydrogen.

Abraham De Luna
Posts: 31
Joined: Sat Sep 14, 2019 12:16 am

Re: Water in Coordination Compounds

Postby Abraham De Luna » Sun Dec 01, 2019 11:45 pm

It is to emphasize that the oxygen is what is bonded and not the hydrogen.


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