Solvent Effects on the Phosphorescent State of Some Aromatic Carbonyls

1972 ◽  
Vol 50 (22) ◽  
pp. 3601-3606 ◽  
Author(s):  
James B. Gallivan
Keyword(s):  
Heavy Atom ◽  
Solvent Polarity ◽  
Triplet States ◽  
Absorption Bands ◽  
Fundamental Properties ◽  
Relative Contribution ◽  
Alkyl Derivatives ◽  
Solvent Environment ◽  
Derivatives Of ◽  
Phosphorescent State

Triplet state properties of chromone, 4-chromanone, acetophenone, and several alkyl derivatives of acetophenone were studied in a variety of solvent systems. The phosphorescence excitation method was used to monitor the energies and relative intensities of singlet–triplet absorption bands in the presence and absence of heavy atom solvents. The results, combined with earlier optical and magnetic resonance studies of such systems, illustrate the importance of solvent environment in determining fundamental properties of these excited states. Observed trends are interpreted in terms of contrasting effects of changing solvent polarity on proximate n,π* and π.π* triplet states. To describe the relative contribution of each orbital type to the phosphorescent state, the coefficients of each wavefunction must change with solvent. Correspondingly, the solvent environment should be specified whenever orbital designations are made.

Effect of a heavy atom on photophysical deactivation of triplet states of tetrachloro-substituted derivatives of dibenzo-p-dioxine of symmetry D2h and C2h

2000 ◽  
Vol 89 (1) ◽  
pp. 42-49
Author(s):  
V. G. Klimenko ◽  
R. N. Nurmukhametov ◽  
S. A. Serov ◽  
E. A. Gastilovich
Keyword(s):  
Heavy Atom ◽  
Triplet States ◽  
Derivatives Of

7-O-Alkyl derivatives of daunomycinone

1984 ◽  
Vol 49 (1) ◽  
pp. 313-319 ◽  
Author(s):  
Věra Přikrylová ◽  
Petr Sedmera ◽  
Josef V. Jizba ◽  
Jindřich Vokoun ◽  
Helena Lipavská ◽  
...  
Keyword(s):  
H Nmr ◽  
Toluenesulfonic Acid ◽  
Alkyl Derivatives ◽  
Derivatives Of

Reaction of daunomycinone (I) with alcohols and p-toluenesulfonic acid produces a mixture (~3 : 1) of its (7S)- and (7R)-O-alkyl derivatives II-IX. According to the 1H NMR evidence, the alicyclic ring exists in the 9H8 conformation in (7R)-O-alkyl derivatives, on the contrary to (7S)-epimers and 7-epi-daunomycinone that adopt the 8H9 conformation.

Polarized fluorescense of alkyl derivatives of fluorescein, MitoFluo and C8-Fl, in solutions with liposomes

2020 ◽  
Author(s):  
D.M. Beltukova ◽  
V.P. Belik ◽  
Y.N. Antonenko ◽  
A.A. Bogdanov ◽  
G.A. Korshunova ◽  
...  
Keyword(s):  
Alkyl Derivatives ◽  
Derivatives Of

Synthesis and reactivity of halide, hydride, and alkyl derivatives of (pentamethylcyclopentadienyl)(bisphosphine)iron(II)

1990 ◽  
Vol 9 (1) ◽  
pp. 260-265 ◽  
Author(s):  
Rocco A. Paciello ◽  
Juan M. Manriquez ◽  
John E. Bercaw
Keyword(s):  
Alkyl Derivatives ◽  
Derivatives Of

The Alkyl Derivatives of Halogen Phenols and their Bactericidal Action. II. Bromophenols

1933 ◽  
Vol 55 (11) ◽  
pp. 4657-4662 ◽  
Author(s):  
Emil Klarmann ◽  
Louis W. Gates ◽  
Vladimir A. Shternov ◽  
Philip H. Cox
Keyword(s):  
Bactericidal Action ◽  
Alkyl Derivatives ◽  
Derivatives Of

570. Compounds of potential pharmacological interest. Part IV. Aryl and alkyl derivatives of 1-aminoindane

1956 ◽  
pp. 2928 ◽  
Author(s):  
J. A. Barltrop ◽  
R. M. Acheson ◽  
P. G. Philpott ◽  
K. E. MacPhee ◽  
J. S. Hunt
Keyword(s):  
Alkyl Derivatives ◽  
Pharmacological Interest ◽  
Derivatives Of

Depletion of singlet and triplet states of 1-amino-5, 6, 7, 8-tetrahydronaphthalene due to external heavy-atom perturbation

1986 ◽  
Vol 8 (5) ◽  
pp. 541-552 ◽  
Author(s):  
K. Chatterjee ◽  
S. Chakravorti ◽  
T. Ganguly ◽  
S. B. Banerjee
Keyword(s):  
Heavy Atom ◽  
Triplet States ◽  
Singlet And Triplet States

Synthesis of Galactomannan Sulfate-Citrate

2022 ◽  
Vol 1049 ◽  
pp. 218-223
Author(s):  
Aleksandr S. Kazachenko ◽  
Yuriy N. Malyar ◽  
Anna S. Kazachenko
Keyword(s):  
Biological Activity ◽  
Ftir Spectroscopy ◽  
X Ray Diffraction ◽  
Absorption Bands ◽  
X Ray ◽  
Mixed Ester ◽  
First Time ◽  
Derivatives Of

Sulfated derivatives of polysaccharides have anticoagulant, hypolipedimic and other biological activity. In this work, a complex mixed ester of galactomannan, its sulfate-citrate, was obtained for the first time. The introduction of citrate and sulfate groups was proved by FTIR spectroscopy by the appearance of corresponding absorption bands. It was shown by X-ray diffraction that the introduction of the citrate group leads to the amorphization of the galactomannan structure.

scholarly journals CHEMISTRY AND SYNTHESIS OF SOME DIHYDRO-2H-l,4-BENZOTHIAZINE DERIVATIVES

1966 ◽  
Vol 44 (11) ◽  
pp. 1247-1258 ◽  
Author(s):  
Raj Nandan Prasad ◽  
Karin Tietje
Keyword(s):  
Alkyl Halides ◽  
Reduction Product ◽  
Alkyl Derivatives ◽  
Reaction Proceeds ◽  
Thiazine Ring ◽  
Derivatives Of ◽  
Compound Xviii ◽  
Acyl Derivatives

The formation of 3-oxo-3,4-dihydro-2H-1,4-benzothiazine (IIIa) by cyclization of alkyl 2-haloacetamidophenyl sulfides (I) was investigated; it is proposed that the reaction proceeds via a six-membered sulfonium halide. The preparation of 4-alkyl derivatives of IIIa and of 4-alkyl and 4-acyl derivatives of its reduction product 3,4-dihydro-2H-1,4-benzothiazine (Va) is described. Acylation of Va was shown to proceed without opening of the thiazine ring. Preparation of the O-benzoyl, N-benzoyl, and O,N-dibenzoyl derivatives of 2-(β-hydroxyethyl-mercapto)aniline (VIII) has permitted clarification of the confusion in the literature with respect to the derivatives of Va and VIII. Compound XVIII, the 1,1-dioxide of IIIa, undergoes C-alkylation at the 2-position when treated with alkyl halides, rather than O-alkylation as previously suggested.

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