Nitroprusside

Discussion in 'Chemistry' started by Idle Mind, Aug 29, 2007.

  1. Idle Mind What the hell, man? Valued Senior Member

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    Sodium Nitroferricyanide

    Hi, I was wondering if someone could help me out with the aforementioned compound. I was meandering my way through wikipedia while at work today, and I came across nitroprusside while in the hemoglobin article.

    The article lists the molecule as a dianion, but I can't for the life of me find where the negative charge(s) should be on the molecule (in fact, it looks like there are two positively charged atoms there -- the nitrogen and oxygen of the nitric oxide group). I am usually pretty good with strictly organic molecules, but bio-inorganics are somewhat unfamiliar to me. I'm guessing it will have to do with the iron atom, but I am really just speculating. There is an image at the wikipedia article.
     
    Last edited: Aug 30, 2007
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  3. Idle Mind What the hell, man? Valued Senior Member

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    Okay, so it's on the Iron. But what about the positives?

    Any explanations?
     
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  5. Nasor Valued Senior Member

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    The iron has a charge of +2, the NO ligand has a charge of +1, and each of the five cyanide groups has a charge of -1. So you have 5 units of negative charge and three of positive, giving you -2 overall.
     
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  7. Idle Mind What the hell, man? Valued Senior Member

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    That makes sense, thanks Nasor. I was treating the bonds between the ligands and the iron as proper covalent bonds, which would eliminate the negative charges on the cyanide ligands and create a positive one on the nitrogen of the nitric oxide ligand.
     
    Last edited: Aug 30, 2007
  8. Orleander OH JOY!!!! Valued Senior Member

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    I swear to god!!! Every time I see this thread I think it says Nitropussy. Who names these things?!
     
  9. kevinalm Registered Senior Member

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