Chemiluminescence | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-27

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Chemiluminescence


00:01:56 1 General description
00:05:19 2 Liquid-phase reactions
00:07:00 3 Gas-phase reactions
00:09:40 4 Infrared chemiluminescence
00:11:04 5 Enhanced chemiluminescence
00:12:16 6 Applications
00:14:11 7 Biological applications
00:18:15 8 See also



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SUMMARY
=======
Chemiluminescence (also chemoluminescence) is the emission of light (luminescence), as the result of a chemical reaction. There may also be limited emission of heat. Given reactants A and B, with an excited intermediate ◊,

[A] + [B] → [◊] → [Products] + lightFor example, if  [A] is luminol and [B] is hydrogen peroxide in the presence of a suitable catalyst we have:

  
    
      
        
          
            
              
                
                  C
                  
                    8
                  
                  
                    
                  
                
                
                  H
                  
                    7
                  
                  
                    
                  
                
                
                  N
                  
                    3
                  
                  
                    
                  
                
                
                  O
                  
                    2
                  
                  
                    
                  
                
              
              luminol
            
          
          +
          
            
              
                
                  H
                  
                    2
                  
                  
                    
                  
                
                
                  O
                  
                    2
                  
                  
                    
                  
                
              
              
                hydrogen
                 
                peroxide
              
            
          
          ⟶
          3
          
          
            −
          
          APA
          
            [
            ◊
            ]
          
          ⟶
          
            3
            
            
              −
            
            APA
          
          +
          light
        
      
    
    {\displaystyle {\ce {{\underset {luminol}{C8H7N3O2}}+{\underset {hydrogen\ peroxide}{H2O2}}-3-APA[\lozenge ]-{3-APA}+light}}}
  where:

3-APA is 3-aminophthalate
3-APA[◊] is the vibronic excited state fluorescing as it decays to a lower energy level.