Using prefixes bis-, tris-, etc.

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K Honeychurch 1K
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Using prefixes bis-, tris-, etc.

Postby K Honeychurch 1K » Sun Nov 23, 2014 8:52 pm

I know that you use these prefixes if the ligand has a name with di-, tri-, etc. but in 16.29 (d) sodium bisoxalato(diaqua)ferrate (III) and 16.30 (d) sodium tris(oxalato)rhodium(III) the book uses bis- and tris- in front of oxalato. Why?
Also, why are diaqua (in 16.29d) and oxalato (16.30d) in parenthesis?
Thanks!

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Re: Using prefixes bis-, tris-, etc.

Postby Chem_Mod » Mon Nov 24, 2014 11:40 am

Multiple polydentate ligands in a complex are named using the bis, tris, tetrakis convention. Parentheses around ligands help to emphasize that they are separate ligands independently binding to the transition metal ion and not part of a larger binding to only one site.

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Re: Using prefixes bis-, tris-, etc.

Postby Chem_Mod » Mon Nov 24, 2014 7:47 pm

If the ligand already contains a Greek prefix (e.g. ethylenediamine) or if it is polydentate ligands (i.e. can attach at more than one binding site) the prefixes bis-, tris-, tetrakis-, pentakis-, are used instead.

Jeannie Huang 3B
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Re: Using prefixes bis-, tris-, etc.

Postby Jeannie Huang 3B » Wed Nov 18, 2015 8:43 pm

Why does that problem put diaqua before bixoxalato? Isn't it supposed to be according to alphabetical order?
so sodium diaqua bisoxalato ferrate (III)


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