THE LUMINESCENCE OF COMPLEX MOLECULES IN RELATION TO THE INTERNAL CONVERSION OF EXCITATION ENERGY. PART I

1959 ◽  
Vol 37 (8) ◽  
pp. 1367-1372 ◽  
Author(s):  
Robin M. Hochstrasser
Keyword(s):  
Excited State ◽  
Internal Conversion ◽  
Exciting Light ◽  
Intramolecular Energy Transfer ◽  
Excited Singlet ◽  
Complex Molecules ◽  
Transfer Processes ◽  
Singlet States ◽  
Energy Part ◽  
Excited Singlet States

The relative fluorescence yields of a variety of double molecules have been measured as a function of the wavelength of exciting light. In some cases the yield from the second excited state is lower than from the first. This effect is attributed to either photodecomposition or to the enhancement of intramolecular energy transfer processes which can compete with the internal conversion between the excited singlet states. The experiments on bianthrone have suggested a method of elucidating the mechanism of the photochromic isomerization of this compound.

THE LUMINESCENCE OF COMPLEX MOLECULES IN RELATION TO THE INTERNAL CONVERSION OF EXCITATION ENERGY: PART II. N-HETEROAROMATICS

1960 ◽  
Vol 38 (2) ◽  
pp. 233-239 ◽  
Author(s):  
Robin M. Hochstrasser
Keyword(s):  
Excitation Energy ◽  
Internal Conversion ◽  
Absolute Ethanol ◽  
Exciting Light ◽  
Excited Singlet ◽  
Complex Molecules ◽  
Heavy Atoms ◽  
Singlet States ◽  
Energy Part ◽  
Excited Singlet States

The relative fluorescence and/or phosphorescence yields of a number of methyl- and halogeno-quinolines, isoquinolines, and acridines have been measured as a function of the wavelength of the exciting light. In all cases the solvent was absolute ethanol. The results show that the efficiency of internal conversion processes between excited singlet states is extremely high in comparison to other intramolecular steps. The effect of substituted heavy atoms is discussed, as well as the fluorescence of the conjugate acids of the bases.

scholarly journals Structures, dipole moments and excited state lifetime of isolated 4-cyanoindole in its ground and lowest electronically excited singlet states

2019 ◽  
Vol 21 (27) ◽  
pp. 14766-14774 ◽  
Author(s):  
Marie-Luise Hebestreit ◽  
Michael Schneider ◽  
Hilda Lartian ◽  
Vivienne Betz ◽  
Michael Heinrich ◽  
...  
Keyword(s):  
Excited State ◽  
Dipole Moments ◽  
Excited State Lifetime ◽  
Excited Singlet ◽  
Singlet States ◽  
Electronically Excited ◽  
Excited Singlet States

The rotationally resolved electronic Stark spectrum of 4-cyanoindole and some N-D and C-D deuterated isotopologues has been measured and analyzed.

The photochemistry of indenyl alcohols and esters: Substituent effects on the competition between ion- and radical-derived products

2003 ◽  
Vol 81 (10) ◽  
pp. 1083-1095 ◽  
Author(s):  
J A Pincock ◽  
I S Young
Keyword(s):  
Excited State ◽  
Ground State ◽  
Fluorescence Emission ◽  
Substituent Effects ◽  
Sharp Contrast ◽  
Carboxylate Anion ◽  
Excited Singlet ◽  
Heterolytic Cleavage ◽  
Singlet States ◽  
Excited Singlet States

The photochemistry of the indenyl acetates 1 and pivalates 2, substituted with X = H, 5-CH3O, and 6-CH3O, have been examined in both methanol and cyclohexane. The precursor alcohols 3 were also found to be photoreactive. Although only radical-derived products were obtained in cyclohexane, both ion- and radical-derived products were formed in methanol. The absence of significant fluorescence emission from any of the substrates 1, 2, and 3 indicates that the excited singlet states are highly reactive. A mechanism is proposed for the ion-derived products that proceeds through direct heterolytic cleavage to give an indenyl cation – carboxylate anion pair. The indenyl cations generated are anti-aromatic in the ground state and their efficient generation by this photochemical solvolysis is in sharp contrast to the very low reactivity of related ground-state substrates. For the pivalate esters 2, an excited-state migratory decarboxylation is proposed for the formation of tert-butyl derived products.Key words: ester photochemistry, indenyl cations, indenyl radicals.

Internal conversion from the lowest excited singlet states of aromatic hydrocarbons

1971 ◽  
Vol 11 (4) ◽  
pp. 472-473 ◽  
Author(s):  
A. Kearvell ◽  
F. Wilkinson
Keyword(s):  
Aromatic Hydrocarbons ◽  
Internal Conversion ◽  
Excited Singlet ◽  
Singlet States ◽  
Excited Singlet States

scholarly journals Ultrafast Decay of the Excited Singlet States of Thioxanthone by Internal Conversion and Intersystem Crossing

ChemPhysChem ◽  
2010 ◽  
Vol 11 (2) ◽  
pp. 480-488 ◽  
Author(s):  
Gonzalo Angulo ◽  
Jakob Grilj ◽  
Eric Vauthey ◽  
Luis Serrano-Andrés ◽  
Òscar Rubio-Pons ◽  
...  
Keyword(s):  
Internal Conversion ◽  
Intersystem Crossing ◽  
Excited Singlet ◽  
Singlet States ◽  
Excited Singlet States

Excited-state reactivities. II. Basicities of some polymethylbenzenes in their excited singlet states

1967 ◽  
Vol 71 (3) ◽  
pp. 589-592 ◽  
Author(s):  
Robert L. Flurry ◽  
R. Keith Wilson
Keyword(s):  
Excited State ◽  
Excited Singlet ◽  
Singlet States ◽  
Excited Singlet States

Influence of excited state aromaticity in the lowest excited singlet states of fulvene derivatives

2011 ◽  
Vol 13 (28) ◽  
pp. 12912 ◽  
Author(s):  
Martin Rosenberg ◽  
Henrik Ottosson ◽  
Kristine Kilså
Keyword(s):  
Excited State ◽  
Excited Singlet ◽  
Singlet States ◽  
Excited Singlet States
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