Oscillator strength of the long-wave absorption band and inhibition activity of some hydrogenated quinolines

1967 ◽  
Vol 6 (4) ◽  
pp. 360-362
Author(s):  
R. P. Vorob'eva ◽  
L. P. Zalukaev ◽  
E. N. Ivanova
Keyword(s):  
Absorption Band ◽  
Oscillator Strength ◽  
Inhibition Activity ◽  
Wave Absorption ◽  
Long Wave

The Structure of Polyisoprenes. V. Ultraviolet Absorption Spectra of Certain Carbalkoxy-Substituted 1,5-Dienes, and the Charge-Resonance Spectra of Glutaconic Ester Enolate Ions

1946 ◽  
Vol 19 (1) ◽  
pp. 23-33
Author(s):  
L. Bateman ◽  
H. P. Koch
Keyword(s):  
Absorption Band ◽  
Absorption Spectra ◽  
Special Interest ◽  
Crystalline State ◽  
Marked Change ◽  
Cyanine Dyes ◽  
Structural Type ◽  
Wave Absorption ◽  
Long Wave ◽  
Ester Enolate

Abstract Spectral evidence supports the conclusion reached in Part IV that ring-chain mesomerism in methyl and ethyl Δ1,5-hexadiene-l,1,3,3,4,4,6,6-octacarboxylates is nonexistent in solution, just as in the crystalline state. The data are not inconsistent with chain hyperconjugation in these molecules. The marked change in structural type that follows the addition of one molecule of hydrogen or hydrolytic reagent has been verified spectrographically. The spectra of methyl and ethyl α,γ-dicarboxyglutaconic esters and their sodium and cupric derivatives have been measured in various solvents, and their tautomeric behavior compared with that of other keto-enols. Of special interest is the intense long-wave absorption band of the enolate ions, which are recognized as simple structural analogs of the cyanine dyes giving rise to similar charge-resonance spectra. A preliminary comment is made on the present accepted structure of ethyl 6-ethoxy-α-pyrone-3:5-dicarboxylate.

On the Determination of Transition-Moment Directions from Absorption Anisotropy Measurements

1987 ◽  
Vol 42 (6) ◽  
pp. 617-621 ◽  
Author(s):  
A. Kawski ◽  
Z. Gryczyński
Keyword(s):  
Absorption Band ◽  
Polymer Film ◽  
Stretch Ratio ◽  
Transition Moment ◽  
Molecular Axis ◽  
Small Deviations ◽  
Wave Absorption ◽  
Long Wave ◽  
Absolute Transition

A formula is derived for the absorption anisotropy K = (A∥ - A⊥) / (A∥ + 2A⊥ ) (where A∥ and A⊥ are the absorbances parallel and perpendicular to the stretching direction of the polymer film, respectively) as a function of the stretch ratio, Rs, of the film and the angle φ between the absorption transition moment direction and the long axis of a prolate molecule. Employing this relation, absolute transition moment directions (the angles φ) were determined experimentally for the following compounds: 1.8-diphenyloctatetraene (DPO), 1,6-diphenylhexatriene (DPH), 1.4-diphenylbutadiene (DPB), 4-dimethylamino-4'-nitrostilbene (DNS), 4-dimethylamino- 4'-chlorostilbene (DCIS) and p-terphenyl (TP). The directions were found to be along the long molecular axis in the long-wave absorption band. Small deviations of the angles obtained from (φ= 0°, which were of the order of several degrees, are due to the incomplete linearity of the molecules under investigation.

scholarly journals On the Determination of Transition-Moment Directions from Emission Anisotropy Measurements

1986 ◽  
Vol 41 (10) ◽  
pp. 1195-1199 ◽  
Author(s):  
A. Kawski ◽  
Z. Gryczyński
Keyword(s):  
Absorption Band ◽  
Polymer Film ◽  
Transition Moment ◽  
Emission Anisotropy ◽  
Wave Absorption ◽  
Long Wave ◽  
Linear Trans

Based on the theory of photoluminescence polarization, a description of the determination of transition-moment directions in luminescent molecules oriented in a stretched polymer film is given. This method is applied to the linear trans-diphenylpolyenes (C2h symmetry): 1,8-diphenyloctatetraene (DPO ), 1,6-diphenylhexatriene (DPH) and 1,4-diphenylbutadiene (DPB). The same transition moment polarized along the long axis o f DPO , DPH and DPB is responsible for absorption and fluorescence (β ≈ 0), when exciting in the long wave absorption band. The results are compared with relevant data obtained from dichroism measurements.

Complexing between palladium(II) halides and p-NOC6H4NMe2 and p-NOC6H4NEt2

1969 ◽  
Vol 47 (16) ◽  
pp. 3075-3077 ◽  
Author(s):  
I. Batten ◽  
K. E. Johnson
Keyword(s):  
Absorption Band ◽  
Oscillator Strength ◽  
Organic Ligand ◽  
Band Position ◽  
Visible Spectra ◽  
Infrared Data

The complexes PdL2X2 (L = p-nitrosodimethylaniline, p-nitrosodiethylaniline; X = Cl, Br, I) have been prepared. The principal absorption band in the visible spectra of the complexes has been identified as a π–π* transition centered primarily on the ligands on the basis of its high oscillator strength, the similarity of the latter to that of the free organic ligand, and the insensitivity of the band position to the nature of the halide. Infrared data indicate that palladium is bonded through the NO group.

Sign in / Sign up

Export Citation Format

Share Document