An experimental study of the electronic absorption and fluorescence spectral properties of new p-substituted-N-phenylpyrroles and their electrosynthesized polymers

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

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19891203 ◽

1989 ◽

Vol 54 (5) ◽

pp. 1203-1208 ◽

Cited By ~ 1

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.

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Experimental study and Ab-initio calculations on the molecular structure, infrared and Raman spectral properties of dinitroimidazoles

Chemical Data Collections ◽

10.1016/j.cdc.2017.01.005 ◽

2017 ◽

Vol 9-10 ◽

pp. 11-23 ◽

Cited By ~ 1

Author(s):

P. Ravi

Keyword(s):

Molecular Structure ◽

Experimental Study ◽

Ab Initio Calculations ◽

Ab Initio ◽

Spectral Properties ◽

Raman Spectral

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Diels-Alder additions of dimethyl acetylenedicarboxylate to sterically hindered cyclohexa-2,4-dienones. Formation and X-ray structure analysis of stereoisomeric bicyclo[2.2.2]octadienones

Australian Journal of Chemistry ◽

10.1071/ch9831361 ◽

1983 ◽

Vol 36 (7) ◽

pp. 1361 ◽

Cited By ~ 1

Author(s):

H Becker ◽

BW Skelton ◽

AH White

Keyword(s):

Single Crystal ◽

Structure Analysis ◽

Electronic Absorption ◽

Spectral Properties ◽

Diels Alder ◽

Dimethyl Acetylenedicarboxylate ◽

X Ray Diffraction ◽

X Ray ◽

Sterically Hindered

The Diels-Alder addition of dimethyl acetylenedicarboxylate to sterically hindered 2,4-cyclohexadienones (spiro-quinol ethers) gives rise to stereoisomeric bicyclo[2.2.2]octadienones. The structures of three of these have been elucidated by single-crystal X-ray diffraction methods and their 1H n.m.r. and electronic absorption spectral properties are reported.

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