The effects of cyclic terminal groups in 4-aminoazobenzene and related azo dyes. Part 1. Electronic absorption spectra of some monoazo dyes derived from N-phenylpyrrolidine and N-phenylpiperidine

1984 ◽  
pp. 149 ◽  
Author(s):  
Geoffrey Hallas ◽  
Richard Marsden ◽  
John D. Hepworth ◽  
Donald Mason
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Azo Dyes ◽  
Electronic Absorption Spectra ◽  
Monoazo Dyes

Solvatochromism and temperature effects on the electronic absorption spectra of some azo dyes

2009 ◽  
Vol 74 (3) ◽  
pp. 691-694 ◽  
Author(s):  
Kamal Alizadeh ◽  
Susan Seyyedi ◽  
Mojtaba Shamsipur ◽  
Shohreh Rouhani ◽  
Kamaladin Haghbeen
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Azo Dyes ◽  
Temperature Effects ◽  
Electronic Absorption Spectra

Stereochemistry of [carbonato-bis((S)-prolinato)]cobaltate(III) anion

1984 ◽  
Vol 49 (3) ◽  
pp. 680-683 ◽  
Author(s):  
Bohumil Hájek ◽  
Dagmar Sýkorová ◽  
Jiří Chyba
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Cd Spectra

The λ-C1-cis(N), δ-C1-cis(N), λ-C2-cis(N) and δ-C2-cis(N) isomers of the complex K[Co((S)-Pro)2CO3] were chromatographically separated and characterized by their electronic absorption spectra and CD spectra.

Photocolouration of 2,4,4,6-Tetraaryl-4H-pyrans and Their Heteroanalogues: Importance of Hypervalent Photoisomers

1995 ◽  
Vol 60 (10) ◽  
pp. 1621-1633 ◽  
Author(s):  
Stanislav Böhm ◽  
Mojmír Adamec ◽  
Stanislav Nešpůrek ◽  
Josef Kuthan
Keyword(s):  
Reaction Kinetics ◽  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Theoretical Data ◽  
Order Reaction ◽  
Bleaching Process ◽  
First Order ◽  
Photodegradation Products ◽  
Hypervalent Molecules

Molecular geometries of 2,4,4,6-tetraphenyl-4H-pyran (Ia), 4,4-(biphenyl-2,2e-diyl)-2,6-diphenyl-4H-pyran (Ib) and their heterocyclic isomers II-V were optimized by the PM3 method and used for the calculation of electronic absorption spectra by the CNDO/S-CI procedure. Comparison of the theoretical data with experimental UV-VIS absorption spectra made possible to select hypervalent molecules IIIa, IIIb, IVa and IVb being responsible for the photocolouration of 4H-pyrans Ia, Ib, while compounds Va, Vb, VI and VII come into account as possible photodegradation products. The bleaching process of the UV illuminated compound Ia is analyzed in terms of dispersive first-order reaction kinetics.

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