On the photoelectron and ultraviolet spectra of molecules containing a divalent sulfur atom and a carbonyl group separated by a methylene group

1976 ◽  
Vol 54 (19) ◽  
pp. 3026-3030 ◽  
Author(s):  
P. R. Olivato ◽  
H. Viertler ◽  
B. Wladislaw ◽  
K. C. Cole ◽  
C. Sandorfy
Keyword(s):  
Carbonyl Group ◽  
Absorption Spectra ◽  
Sulfur Atom ◽  
Lone Pair ◽  
Ultraviolet Absorption ◽  
Photoelectron Spectra ◽  
Ultraviolet Spectra ◽  
Methylene Group ◽  
Divalent Sulfur

Photoelectron spectra show that in CH3SCH2COCH3 the sulfur and carbonyl lone pair orbitals [Formula: see text] are both stabilized with respect to the compounds containing S or CO only. This is in keeping with the observed values of the basicity constants. The ultraviolet absorption spectra contain the expected [Formula: see text] and [Formula: see text] bands and give evidence for a significant amount of mixing between the excited orbitals.

The Ultraviolet Absorption Spectra of the Acridone Alkaloids. II. Compounds related to 4-Quinolone

1950 ◽  
Vol 3 (4) ◽  
pp. 615 ◽  
Author(s):  
RD Brown ◽  
FN Lahey
Keyword(s):  
Absorption Spectra ◽  
Degradation Products ◽  
Ultraviolet Absorption ◽  
Ultraviolet Spectra ◽  
Acridone Alkaloids ◽  
Qualitative Discussion

A qualitative discussion, based mainly upon the MO approximation, is presented for the ultraviolet spectra of naphthalene, quinolone, and some degradation products of the acridone alkaloids related to 4-quinolone.

INTERACTION BETWEEN THE CARBONYL GROUP AND A SULFUR ATOM. PART XI PHOTOELECTRON SPECTRA OF SOME 2-ALKYLTHIOCYCLOPENTANONES

1983 ◽  
Vol 16 (3) ◽  
pp. 287-291 ◽  
Author(s):  
Camille Sandorfy ◽  
Jerry W. Lewis ◽  
Blanka Wladislaw ◽  
Isabel C. C. Calegäo
Keyword(s):  
Carbonyl Group ◽  
Sulfur Atom ◽  
Photoelectron Spectra

The Ultraviolet Absorption Spectra of the Acridone Alkaloids. I. Compounds containing the Acridone Nucleus

1950 ◽  
Vol 3 (4) ◽  
pp. 593 ◽  
Author(s):  
RD Brown ◽  
FN Lahey
Keyword(s):  
Electron Density ◽  
Absorption Spectra ◽  
Ultraviolet Absorption ◽  
Absorption Bands ◽  
Ultraviolet Spectra ◽  
Spectral Changes ◽  
Acridone Alkaloids

The ultraviolet spectra of the acridone alkaloids and some derivatives have been studied. The various bands in the spectra of these compounds are interpreted by starting with theoretical treatments of the spectrum of anthracene and tracing spectral changes through acridine and phenazine to acridone. An interesting relation between the π-electron density of a given position in the acridone ring and the shift in wavelength of absorption bands due to an alkoxyl derivative is noted and the spectra of the alkaloids are shown to comply with this relationship. Compounds containing a 4-hydroxy-10-methylacridone structure are found to have unusual spectra and a possible explanation of this is proposed.

The infrared and ultraviolet absorption spectra of diimide (N2H2)

1968 ◽  
Vol 46 (8) ◽  
pp. 1005-1011 ◽  
Author(s):  
A. Trombetti
Keyword(s):  
Infrared Spectrum ◽  
Absorption Spectra ◽  
Ground State ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Spectrum ◽  
Ultraviolet Absorption ◽  
Electronic Ground State ◽  
Trans Conformation ◽  
Ultraviolet Spectra ◽  
Electronic Ground

The infrared spectrum of N2H2 in the 3.1 μ region and the ultraviolet spectra of N2H2 and N2D2 have been examined. The analysis of the infrared spectrum indicates that N2H2 in the ground state has a planar trans-conformation with with rN−N = 1.238 ± 0.007 Å and [Formula: see text], assuming rN−H to be between 1.05 and 1.08 Å. In the vacuum ultraviolet spectrum near 1700 Å, progressions of bands with spacings of 1180 and 950 cm−1 have been observed for N2H2 and N2D2, respectively. From the intensity alternation in the J structure of the vacuum ultraviolet spectrum it seems to follow that the electronic ground state of N2H2 is not totally symmetric.

THE SYNTHESIS AND ULTRAVIOLET SPECTRA OF SOME PYRAZOLONES

1951 ◽  
Vol 29 (2) ◽  
pp. 182-191 ◽  
Author(s):  
Paul E. Gagnon ◽  
Jean L. Boivin ◽  
Paul A. Boivin ◽  
R. Norman Jones
Keyword(s):  
Absorption Spectra ◽  
Ultraviolet Absorption ◽  
Ultraviolet Spectra

Twenty-five pyrazolones were prepared by reacting mono- or disubstituted cyanoacetic esters with hydrazine, phenylhydrazine and semicarbazide. 4-Benzyl-3-amino-1-phenyl-5-pyrazolone has been synthesized and its properties have been compared with those of the corresponding 2-phenylpyrazolone derivative. The ultraviolet absorption spectra of several pyrazolones have been determined.

Aromaticity in heterocyclic molecules containing divalent sulfur

1988 ◽  
Vol 53 (9) ◽  
pp. 2023-2054 ◽  
Author(s):  
Milan Randić ◽  
Sonja Nikolić ◽  
Nenad Trinajstić
Keyword(s):  
Sulfur Atom ◽  
Positional Isomers ◽  
Heterocyclic Molecules ◽  
Resonance Energies ◽  
Conjugated Circuits ◽  
Divalent Sulfur

The conjugated circuits model is applied to heterocycles containing divalent sulfur. A novel parametrization is introduced for 4n + 2 and 4n conjugated circuits containing a single sulfur atom. The relative aromatic stabilities of a number of heterocyclic systems containing divalent sulfur are studied. Comparison is made whenever possible with earlier reported resonance energies of these compounds, obtained by using Huckel MO and SCF π-MO models, and appropriate reference structures. Special attention is given to positional isomers. An explanation of the differences amongst such isomers is given.

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