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I'm not an expert teacher or lecturer of chemistry. I was only a student from SMA NEGERI 15 SURABAYA who had been one of the Bronze Medalist Participants of Olimpiade Sains Nasional X (2011) of Chemistry In Manado, North Sulawesi, 11 - 16 September 2011 and graduated in 2012. Now, I'm studying at Universitas Airlangga in Surabaya, Indonesia. I do love chemistry and I would like to help them who had difficulties in studying chemistry. That's why, please understand me if you found some misconcepts in my entries. Suggestions are always necessary in order to develop this blog. And I'm sorry because my English isn't so well.

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Saturday, August 18, 2012

Why is Ferrocene an Aromatic Complex Compound?

Ferrocene (bis(η5-cyclopentadienyl)iron) is a unique compound. I think I have to write an article about it.
First, the picture below shows the structure of the Ferrocene:


 

From the picture above, we have a question: What makes this compound an aromatic compound?
Huckel Approximation tells us that the aromatic compound must have 4n + 2 pi electrons. From the structure above, there's only 5 pi electrons for each cyclopentadiene so what makes it?

The answer is simple.
This Iron is in Fe2+ form, which is mean we have to stabilize the positive charge. 
In other way, we have to say that each cyclopentadiene has 1 more electron so that it forms an anion. Which is mean now, the diene has 6 pi electrons.

http://upload.wikimedia.org/wikipedia/commons/thumb/c/c9/Photo_of_Ferrocene_%28powdered%29.JPG/800px-Photo_of_Ferrocene_%28powdered%29.JPG

Crystal of Ferrocene

Source:
Wikipedia

Thank You

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