View source for It07:Melem (Melon)

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! {{chembox header}} | General
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| [http://en.wikipedia.org/wiki/IUPAC Systematic name]
| 1,3,4,6,7,9,9b-Heptaazaphenalene

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| Other names
| tri-s-triazine, cyamelurine
|-
| [http://en.wikipedia.org/wiki/Chemical_formula Molecular formula]
| C<sub>6</sub>N<sub>7</sub>(NH<sub>2</sub>)<sub>3</sub>
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| [http://en.wikipedia.org/wiki/Molar_mass Molar mass]
| 218
|-
| Appearance
| fine, pale yellow powder
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| [http://en.wikipedia.org/wiki/CAS_registry_number CAS number]
| 1502-47-2 
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! {{chembox header}} | Properties
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| [http://en.wikipedia.org/wiki/Density Density] & [http://en.wikipedia.org/wiki/Phase_%28matter%29 phase]
| 1.717 g/cm³ <!-- ? g/cm³, solid / ? g/ml, liquid / ? g/l, gas -->
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Melem, or Melon (the polymeric form) is the novel name for Tri-s-triazines, or a functional group of C<sub>6</sub>N<sub>7</sub> triangular. The melem group of compounds are relatively unreactive due to large amount of resonance that can occur throughout the system.

==History==
The Melems were first discovered by Jöns Jakob Berzelius in the 1830s,when he found the substance after igniting mercury thiocyanate. The polymer melon was later named by Justus VonLiebig.

==Specific Melems and Their Uses==
The Melem compound itself is used as a fire retardant<ref>[http://www.specialchem4polymers.com/tc/melamine-flame-retardants/index.aspx?id=4013 Flame retardant properties of melem]</ref>. This is done by preventing either preventing ignition, this is done by causing a heat sink through thermal decomposition (at a high temperature). The nitrogen produced through this decomposition is inert, and so can act as a inert diluting agent. The Melem can also create a barrier between oxygen and other gases, being stable means that this barrier will not break down.
Melem triangles can be joined together by of a C-N-C bond or C-N-N bond to give a range of polymers<ref>[http://www3.interscience.wiley.com/cgi-bin/fulltext/76509465/PDFSTART The First Synthesis and Characterization of Cyameluric High Polymers, Tamikuni Komatsu]</ref>.

==Structure==
<jmol>
<jmolApplet>
<size>400</size>
<title>Melem</title><color>white</color>
<uploadedFileContents>Melem.MOL</uploadedFileContents>
</jmolApplet>
</jmol>

==Synthesis==
2 possible synthesises have been suggested for Melem<ref>[http://pubs.acs.org/cgi-bin/sample.cgi/jacsat/2003/125/i34/pdf/ja0357689.pdf Melem (2,5,8-Triamino-tri-s-triazine), an Important Intermediate during Condensation of Melamine Rings to Graphitic Carbon nitride: Synthesis, Structure Determination by X-ray Powder Diffractometry, Solid state NMR and Theaoretical Studies, Barbara Jurgens et al, 2003]</ref>, both involving the condensation of melamine ringsMelem can be synthesised through two main methods; through the condensation of melamine rings:
<br> '''Possible Mechanism 1:'''
[[Image:Melemmechanism1.gif]]
<br>'''Possible Mechanism 2:'''
[[Image:Melemmechanism2.gif]]

==References==
<references/>