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Water in Coordination Compounds

Posted: Sun Dec 01, 2019 2:08 pm
by TheresaDsilva4A
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!

Re: Water in Coordination Compounds

Posted: Sun Dec 01, 2019 2:21 pm
by Trinity Vu 1D
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]

Re: Water in Coordination Compounds

Posted: Sun Dec 01, 2019 2:23 pm
by Norman Dis4C
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.

Re: Water in Coordination Compounds

Posted: Sun Dec 01, 2019 9:15 pm
by cassidysong 1K
Its just to emphasize that it's the oxygen bonding to the compound.

Re: Water in Coordination Compounds

Posted: Sun Dec 01, 2019 10:10 pm
by Jordan Ziegler 2J
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?

Re: Water in Coordination Compounds

Posted: Sun Dec 01, 2019 10:12 pm
by saigorijavolu2k
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.

Re: Water in Coordination Compounds

Posted: Sun Dec 01, 2019 11:43 pm
by emaad_3H
It's just so you know that the oxygen is what is bonded and not the hydrogen.

Re: Water in Coordination Compounds

Posted: Sun Dec 01, 2019 11:45 pm
by Abraham De Luna
It is to emphasize that the oxygen is what is bonded and not the hydrogen.