scholarly journals The Electronic Absorption and Emission Spectra of Biphenylene-2,3-dione in Solutions

1981 ◽  
Vol 54 (3) ◽  
pp. 873-877 ◽  
Author(s):  
Akira Kuboyama
Keyword(s):  
Electronic Absorption ◽  
Emission Spectra ◽  
Absorption And Emission ◽  
Absorption And Emission Spectra

Synthesis and properties of styryl-substituted tetrapyrazinoporphyrazines [St8PyzPzM], M = 2NaI, MgII(H2O) and ZnII

2010 ◽  
Vol 14 (09) ◽  
pp. 793-803 ◽  
Author(s):  
Maria Pia Donzello ◽  
Elisa Viola ◽  
Larisa A. Tomachinskaya ◽  
Claudio Ercolani ◽  
Maddalena Corsini ◽  
...  
Keyword(s):  
Electronic Absorption ◽  
Electrochemical Behavior ◽  
Spectral Properties ◽  
Electronic Excitation ◽  
Light Harvesting ◽  
Emission Spectra ◽  
Strong Emission ◽  
Absorption And Emission ◽  
Absorption And Emission Spectra

New styryl-substituted tetrapyrazinoporphyrazines [St8PyzPzM] (M = 2NaI , MgII(H2O) and ZnII ; St = -CH=CHAr , where Ar = phenyl or cumyl) were prepared by template cyclotetramerization of 5,6-distyrylpyrazine-2,3-dicarbonitriles available from condensation of diaminomaleodinitrile with the substituted cinnamils (StCO)2 obtained from biacetyl and arylaldehydes ArCHO . The new porphyrazine macrocycles were characterized by electronic absorption and emission spectra, which provide evidence of efficient π-interaction of the peripheral styryl moieties with the central pyrazinoporphyrazine framework. The electronic excitation of the stylbenoid chromophore in the near UV-region (400 nm) leads to strong emission of the porphyrazine chromophore near 700 nm, allowing to consider the styryl-substituted porphyrazines as efficient light-harvesting species. Their spectral properties and electrochemical behavior are compared with those of stylbenoid phthalocyanines and peripherally substituted tetrapyrazinoporphyrazines.

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