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Chem Question-- Ligands and Coordination Complexes Chem Question-- Ligands and Coordination Complexes
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Old 05-12-2008, 06:03 PM   #1
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Chem Question-- Ligands and Coordination Complexes
What metals form what? How many do we need to know?

I think I know that

Metal ion ligand bonds

Fe3+ 6
Cu2+ 4

Can someone post a list of metal ions : ligand bonds that need to be memorized please because I just learned about this concept today and my Princeton Review book does not cover it? >.<

A link would work too. Ty in advance.
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Old 05-12-2008, 06:08 PM   #2
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the central ions are transition metals and Al3+. The ligands are polar molecules and anions. ie. NH3, H20, OH-, CN-, Cl-. example of complex ion formation :
Aluminum is mixed in water. Al3+ + H20 = Al(H20)6, notice that the amounts of ligands is double the charge of the central ion. Thats how it usually is. Not always but usually. The CB ppl wont be that evil to put a non general mixture.
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Old 05-12-2008, 06:13 PM   #3
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So I can assume that number of ligand bonds are double the charge? Excellent.
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Old 05-12-2008, 06:14 PM   #4
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well generally yes. There are some times when theres an abnormality. But dont worry about that, u wont need to know it.
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Old 05-12-2008, 06:18 PM   #5
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Why is H2O a ligand? :S
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Old 05-12-2008, 06:19 PM   #6
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What is a ligand? And/or a complex ion?
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Old 05-12-2008, 06:22 PM   #7
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A ligand is a lewis base with a lone pair of electrons. I answered my own question. >.> H2O's oxygen has a lone pair.

Complex ions are transition metals with ligands.
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Old 05-12-2008, 06:25 PM   #8
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I have a nagging feeling I'm missing large amounts of very important AP Chem. knowledge.
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Old 05-12-2008, 06:28 PM   #9
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Join the club. >.>
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Old 05-12-2008, 06:31 PM   #10
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one of the exceptions to post #2 is Al(OH)4 - it doesnt follow the double charge rule
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Old 05-12-2008, 06:47 PM   #11
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ligands and coordination numbers are a pretty small part, right? i've taken 3 practice tests, and ive seen 1 or 2 problems involving them on each test in the MC only..so i wouldn't worry too much about ligands and whatnot

equilibrium, acids/bases, molecular compounds, and chemicl kinetics are the main things i'm gonna look over (plus some other stuff i know just so that i'm fresh for tomorrow)

one more day and i'll be done with chemistry! thank god
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Old 05-12-2008, 06:48 PM   #12
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the thing is they could show up on the eqs also and this year there is no choice so theres no escaping it if they do show up
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Old 05-12-2008, 06:50 PM   #13
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If they haven't shown up...

I'd say there's a fair chance of them showing up on the predictions part.
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Old 05-12-2008, 06:52 PM   #14
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I'm hoping it's an obscure enough topic it won't happen. It just seems like that's needlessly in depth for a section that's supposed to test basic equation skills. There's no use debating whether they'll be on the predictions or not, but just cross your fingers they stay confined to one or two MCQ's.
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Old 05-12-2008, 06:58 PM   #15
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what predictions part are you talking about??
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