Thiolane Analysis
PPV, which is the abbreviated term for phenylenevinylene, has light emitting properties since it has a large conjugated system. This organic molecule is possible to be formed from dichloro-para-xylene which then reacts with methanol and thiolane. The nucleophile would be the thiolane. A good leaving group in this case would be chlorine. After thiolane attacks, it results with dithiolane-xylene. The second step is reaction with sodium hydroxide. The hydroxide it used for deprotonation upon the substituted methyl group. This creates a carbocation. The carbocation attacks another similar monomer in which the thiolane is the leaving group. This creates two thiolanes on one monomer and one thiolane on the other monomer. The monomer with two thiolanes loses one of the thiolanes to form a double bond near the monomer with one thiolane. The mono with one thiolane gets deprotonated and continues the chain. This cannot work without heat. Chlorine itself is not a strong enough base for deprotonation. However, chlorine is a good leaving group, so a Sn2 or Sn1 mechanism can work. The chlorine leaving thus creates a carbocation, but the carbocation can have resonance stability. These
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Phenylenevinylene show light in the green region. Phenylenevinylene has simple carbon chains which entitles weak electron donation groups. This means shifting color to red would happen if an electron donation group is added which entitles the monomer to have a smaller orbital gap. Smaller orbital gaps have lower wavelengths. An example would be with BEH-PPV. BEH-PPV also produces green light such as PPV. BEH-PPV also has a simple carbon structures with basic carbon chains. With BEH-PPV, shifting to blue would entitle an electron withdrawing group to be added to the monomer. The strength of the electron withdrawing group or electron donating group is what determines the distance of how far the blue or red shift will
Phenylenevinylene show light in the green region. Phenylenevinylene has simple carbon chains which entitles weak electron donation groups. This means shifting color to red would happen if an electron donation group is added which entitles the monomer to have a smaller orbital gap. Smaller orbital gaps have lower wavelengths. An example would be with BEH-PPV. BEH-PPV also produces green light such as PPV. BEH-PPV also has a simple carbon structures with basic carbon chains. With BEH-PPV, shifting to blue would entitle an electron withdrawing group to be added to the monomer. The strength of the electron withdrawing group or electron donating group is what determines the distance of how far the blue or red shift will