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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: NYM on September 25, 2006, 12:19:57 PM

Title: What is this one called: Fe(SCN)3
Post by: NYM on September 25, 2006, 12:19:57 PM: It is a complex:
Fe(SCN)₃

Something with thiocyanate and Fe(III)... but not quite sure what.

Help?
Title: Re: What is this one called: Fe(SCN)3
Post by: Korokian on September 25, 2006, 03:34:24 PM: Iron (III) Thiocyanide
Title: Re: What is this one called: Fe(SCN)3
Post by: NYM on September 26, 2006, 02:07:42 PM: I don't think so, because:

"When naming a complex ion, the ligands are named before the metal ion."
http://en.wikipedia.org/wiki/Complex_%28chemistry%29
Title: Re: What is this one called: Fe(SCN)3
Post by: sdekivit on September 26, 2006, 02:22:31 PM: i also know this as iron(III)thiocyanate
Title: Re: What is this one called: Fe(SCN)3
Post by: Will on September 26, 2006, 02:32:10 PM: Quote from: NYM on September 26, 2006, 02:07:42 PM
I don't think so, because:

"When naming a complex ion, the ligands are named before the metal ion."
http://en.wikipedia.org/wiki/Complex_%28chemistry%29

This isn't a complex ion, there is no net charge. It would be known as iron(III)thiocyanate as sdekivit said.
Title: Re: What is this one called: Fe(SCN)3
Post by: NYM on September 26, 2006, 03:34:40 PM: hmm... hmm...
That could be. Maybe I just misunderstood the whole thing. The book says:
" Fe³⁺ + SCN^- -> Fe(SCN)²⁺ "
(which is a complex)
"if [SCN^-] >> [Fe³⁺], then"
... "Fe(SCN)₃"

Thank you!

EDIT: Scooby Snacks for all of you :)
EDIT^2: Oops, I forgot. Is Fe(SCN)₃ easily soluble?
Title: Re: What is this one called: Fe(SCN)3
Post by: Borek on September 26, 2006, 04:04:45 PM: Quote from: Will on September 26, 2006, 02:32:10 PM
This isn't a complex ion, there is no net charge.

I don't recall such a rule.

Fe³⁺ + SCN^- <-> FeSCN²⁺
FeSCN²⁺ + SCN^- <-> Fe(SCN)₂⁺
Fe(SCN)₂⁺ + SCN^- <-> Fe(SCN)₃
Fe(SCN)₃ + SCN^- <-> Fe(SCN)₄^-
Fe(SCN)₄^- + SCN^- <-> Fe(SCN)₅^2-
Fe(SCN)₅^2- + SCN^- <-> Fe(SCN)₆^3-

Is Fe(SCN)₃ complex ion, or not?

For me question is ambiguous.
Title: Re: What is this one called: Fe(SCN)3
Post by: Borek on September 26, 2006, 04:05:22 PM: Quote from: NYM on September 26, 2006, 03:34:40 PM
EDIT^2: Oops, I forgot. Is Fe(SCN)₃ easily soluble?

I think so.
Title: Re: What is this one called: Fe(SCN)3
Post by: NYM on September 27, 2006, 01:50:13 AM: Quote from: Borek on September 26, 2006, 04:04:45 PM
Quote from: Will on September 26, 2006, 02:32:10 PM
This isn't a complex ion, there is no net charge.

I don't recall such a rule.

If it's at complex ion, then there ought to be some kind of charge, right?
That's what I thought.
Title: Re: What is this one called: Fe(SCN)3
Post by: Borek on September 27, 2006, 03:09:52 AM: Quote from: NYM on September 27, 2006, 01:50:13 AM
If it's at complex ion, then there ought to be some kind of charge, right?

Sorry, missed that ion part, but IMHO it is irrelevant here. The compound is either a salt or complex and different rules govern its naming. Whether it is charged or not doesn't help in classification.
Title: Re: What is this one called: Fe(SCN)3
Post by: AWK on September 27, 2006, 04:02:18 AM: Fe(SCN)3 is a compound soluble in water, it can be a complex compound, eg in the crystal, since nitrogen atoms of thiocyanide group can complex other iron atoms, but then the name of compund will be much more composite.