Electronic absorption spectra of enaminodicarbonyl compounds in the 8-azasteroid series

Kurbako, V. Z.; Garbuz, N. I.; Lis, L. G.; Лахвич, Ф. А.; Соловьев, К. Н.

doi:10.1007/bf00659882

J Appl Spectrosc

1983

DOI: 10.1007/bf00659882

|View full text |Cite

Electronic absorption spectra of enaminodicarbonyl compounds in the 8-azasteroid series

V. Z. Kurbako¹,

N. I. Garbuz²,

L. G. Lis³

et al.

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...

Citation Types

Supporting

Mentioning

Contrasting

Year Published

2003

2005

Publication Types

Select...

Article3

Relationship

Self Cite0

Independent3

Authors

Journals

Cited by 3 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The electronic absorption spectrum of 8-azasteroid I vapors is not an exception either. In [6,10,13], these two absorption bands are associated with the π-π * transitions in the N-C=(-C=O)-C=O chromophore of the enaminodicarbonyl grouping, and the absorption with λ max ≈ 200 nm is associated with the π-π * transition in the aromatic ring.…”

mentioning

confidence: 98%

“…In [10][11][12][13], two series of azasteroids, with C=O groups in the cycles C and D and with one group in the cycle D or C, were investigated. In the electronic adsorption spectra of the solutions of the first series of compounds, in the 320-250-nm range, two electron absorption bands in each were observed, and in those of the second series one electron absorption band in each spectrum was observed, i.e., the number of bands in this region of the spectrum is closely associated with the number of C=O groups in the structure of 8-azasteroids.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Absorption and fluorescence of 8-azasteroids in the gas phase

et al. 2005

View full text Add to dashboard Cite

Extensive studies of the spectral-luminescent characteristics of four 8-azasteroids and a model compound 2- (3,3-dimethyl-1,2,3,4-tetrahydro-1-isoquinolidene)-5,5-dimethyl-1,3-cyclohexanedion in the gas phase have been made. From the analysis of the dependences of the absorption spectra on the vapor pressure (T low ) and the fluorescence spectra on T low and the exciting radiation wavelength (λ exc ) a conclusion on the presence in the vapors of the investigated 8-azasteroids of three absorption and fluorescence centers (S-, M-, and L-centers) has been drawn. The absorption spectra of these centers strongly overlap. Their long-wave absorption boundaries have been determined. The dependence of the fluorescence spectra of all three centers on λ exc , which is inherent in rarefied gases of individual organic molecules, is observed. The S-centers are the molecules of the initial steroids, and the M-and L-centers are the molecules of thermo-and phototransformations of the initial steroids. The model compound in the gas phase is characterized by the same dependences of the fluorescence spectra on T low and λ exc as those inherent in 8-azasteroids. Taking into account the additional data obtained as a result of investigation of the absorption and fluorescence spectra of solutions of the substances extracted from vacuum cells after the investigation of 8-azasteroids and the model compound in the gas phase, conclusions on the nature of the M-and L-centers have been drawn.Introduction. The organic complexes of the series of 8-azasteroids feature biological activity and can stimulate or suppress the immunity of living organisms depending on their structure [1]. Therefore, investigations of the spectral characteristics reflecting their structure are important.Earlier it was shown that luminescence of 8-azasteroids is observed in different aggregate states: in the gas phase [2], in solutions [2, 3], and in microcrystals [4]. The analysis of the absorption, fluorescence, fluorescence excitation spectra, and duration of the excited states of a water solution (pH 7.4) of 2,3-dimethoxy-8-azagona-1,3,5(10),13-tetraene-12,17-dion (hereinafter referred to as 8-azasteroid III) has revealed the existence of two centers emitting a long-wave and a short-wave fluorescence [5]. The fluorescence of 8-azasteroid III and 8-aza-D-homogona-1,3,5(10),13-tetraene-12,17a-dion (hereinafter referred to as 8-azasteroid I) in the neutral solvent hexane has been assigned to three centers of luminescence [6]. Assumptions on the nature of the centers have been made.Investigations of 8-azasteroids in the gas phase, where the influence of the medium is excluded, are of particular importance. In the present paper, for the first time the spectral-luminescent characteristics of vapors of this important class of compounds have been studied. We focused on and studied in most detail 8-aza-D-homogonane-1,3,5(10),13-tetraene-12,17a-dion (8-azasteroid I) obtained by annealing 3,4-dihydroisoquinoline by 2-acetyl-1,3-cyclopentadion by the method described in [17]...

show abstract

mentioning

confidence: 98%

mentioning

confidence: 99%

Absorption and fluorescence of 8-azasteroids in the gas phase

et al. 2005

View full text Add to dashboard Cite

show abstract

Phosphorescence of 8-azasteroids and related compounds

Bagnich

Khropik

Knyukshto

et al. 2005

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

View full text Add to dashboard Cite

Phosphorescence of Enaminodicarbonyl-8-Azasteroids and Related Compounds

Bagnich

Khropik

Михальчук

et al. 2003

Journal of Fluorescence

View full text Add to dashboard Cite

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

hi@scite.ai

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Electronic absorption spectra of enaminodicarbonyl compounds in the 8-azasteroid series

Cited by 3 publications

References 2 publications

Absorption and fluorescence of 8-azasteroids in the gas phase

Absorption and fluorescence of 8-azasteroids in the gas phase

Phosphorescence of 8-azasteroids and related compounds

Phosphorescence of Enaminodicarbonyl-8-Azasteroids and Related Compounds

Contact Info

Product

Resources

About