Effect of solvent on the electronic absorption spectral properties of mixed β-octasubstituted free base tetraphenylporphyrins

2021 ◽  
Author(s):  
P. Bhyrappa ◽  
U. K. Sarangi
Keyword(s):  
Electronic Absorption ◽  
Spectral Properties ◽  
Free Base ◽  
Effect Of Solvent

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.

Perfluorinated porphyrazines 1: Synthesis and UV-vis spectral study of perfluorinated octaphenylporphyrazine and its indium(III) complex, [MPA(F5Ph)8](M = 2H, InIII(OH))

2013 ◽  
Vol 17 (08n09) ◽  
pp. 905-912 ◽  
Author(s):  
Pavel A. Stuzhin ◽  
Maksim Yu. Goryachev ◽  
Svetlana S. Ivanova ◽  
Anna Nazarova ◽  
Igor Pimkov ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Spectral Study ◽  
Electronic Absorption Spectra ◽  
Chloroform Solution ◽  
Free Base ◽  
Hypsochromic Shift ◽  
Trans Isomers ◽  
Cis And Trans Isomers ◽  
Cis And Trans

Novel perfluorinated porphyrazine has been prepared as indium(III) complex of octa(pentafluorophenyl)porphyrazine by cyclotetramerization of 1,2-dicyano-1,2-bis(pentafluorophenyl)-ethylene (mixture of cis- and trans-isomers) with basic indium(III) acetate in a melt. The In III complex is stable in trifluoroacetic and sulfuric acids, but is easily demetalated with formation of the free-base in a chloroform solution containing HCl or slighly acidified with CF 3 COOH in the presence of tetraalkylammonium chloride as a catalyst. Perfluorination of octaphenylporphyrazine macrocycle leads to a hypsochromic shift of the Q-band maxima in the electronic absorption spectra, to drastic decrease of the basicity of meso-nitrogen atoms of porphyrazine macrocycle and to increase of the acidity of the internal NH -groups.

Electronic spectral properties of redox coenzyme pyrroloquinoline quinone: A CNDO-CI study

1989 ◽  
Vol 54 (5) ◽  
pp. 1203-1208 ◽  
Author(s):  
Jiří Krechl ◽  
Stanislav Böhm ◽  
Josef Kuthan
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Spectral Properties ◽  
Electronic Absorption Spectra ◽  
Pyrroloquinoline Quinone ◽  
Uv Absorption ◽  
Reduced Form ◽  
Carboxylic Group ◽  
Correct Interpretation

Electronic absorption spectra of coenzyme PQQ and its reduced form, PQQH2, were calculated by the CNDO/S-CI method. The use of 170 monoexcited configurations was found to be necessary in order to give the correct interpretation of observed UV absorption. Influence of the carboxylic group geometries on the spectra is discussed.

Effect of solvent nature on spectral properties of blue-emitting meso-propargylamino-BODIPY

2019 ◽  
Vol 285 ◽  
pp. 194-203 ◽  
Author(s):  
Galina B. Guseva ◽  
Alexander A. Ksenofontov ◽  
Elena V. Antina ◽  
Mikhail B. Berezin ◽  
Anatoliy I. Vyugin
Keyword(s):  
Spectral Properties ◽  
Solvent Nature ◽  
Effect Of Solvent
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