3D model (JSmol)
|Molar mass||g·mol−1 201.66|
|Appearance||White crystalline powder|
|Melting point||225–227 °C (437–441 °F; 498–500 K)|
|Solubility in other solvents||Soluble in methanol, chloroform, and diethyl ether; slightly soluble in pentane|
|Vapor pressure||0.000810 mPa at 20 °C|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Simazine may be prepared in the laboratory from cyanuric chloride crystals and a strong solution of ethyl amine (at least 50 percent by number in water). The reaction is highly exothermic and is therefore best carried out in an ice bath below 10 °C. It is also essential to carry out the synthesis in a fume hood since cyanuric chloride decomposes at high temperatures into hydrogen chloride and hydrogen cyanide, both of which are highly toxic by inhalation.
Properties and uses
Simazine is an off-white crystalline compound which is sparingly soluble in water. It is a member of the triazine-derivative herbicides, and was widely used as a residual nonselective herbicide, but is now banned in European Union states. Like atrazine, a related triazine herbicide, it acts by inhibiting photosynthesis. It remains active in the soil for 2-7 months or longer after application.
- EU directive 91/414/EEC
- Simazine, Extoxnet PIP