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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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Tuesday, December 20, 2011

Singlet Oxygen Gas and Photochemistry Oxidation

First, see the picture below:

Molecular Orbital of Oxygen Gas
(Source: http://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/Images/o2mos.gif)

What is the relation between the molecular orbital of oxygen gas and singlet oxygen gas? Focus your eyes to the LUMO (Lowest Unoccupied Molecular Orbital) of this molecular orbital. There are two unoccupied electrons in the LUMO. This condition may caused the excitation of electron in some conditions.

See the picture below:


There are two types of singlet oxygen, 1g and 1Σ+g. The half-life 1Σ+g of is lower than 1g. And the energy of it is so high so that 1g is mostly used in chemistry experiment.

Singlet Oxygen can be produced with photochemistry method through the irradiation with derivate of fluorescein. The 1g can be a specific oxidizing agent like Cycloaddition [4+2] (Diels - Alder Reaction).



Here is a question from Preparatory Problems of IChO 2011:


From my explanation, now we can answer this question easily:


Source:
Wikipedia
Cotton dkk. 2009. Kimia Anorganik Dasar (Terjemahan). Jakarta: Penerbit Universitas Indonesia
Preparatory Problems of IChO 2011


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