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

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.

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.

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

Quasiparticle Excitations in Polyenes and Polyacetylene

1987 ◽  
Vol 109 ◽  
Author(s):  
Paul Tavan ◽  
Klaus Schulten
Keyword(s):  
Dispersion Relations ◽  
Excited Singlet ◽  
Quasi Particle ◽  
Double Excitation ◽  
Singlet States ◽  
Excited Singlet States ◽  
Electron Excitations ◽  
Quasiparticle Excitations

ABSTRACTWe apply the Pariser-Parr-Pople Hamiltonian to study many-electron excitations in polyenes and polyacetylene. The excited singlet states of polyenes, calculated by a multireference double excitation expansion, are classified as quasi-particle excitations, namely as triplet-triplet magnons and particle-hole excitons. From finite polyene spectra we derive approximate dispersion relations for these quasi-particles in the infinite polyene, i.e. polyacetylene.

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