Excited-state dynamics of fluorene/substituted-benzene van der Waals complexes in supersonic jets: dependence of exciplex formation on the relative energies of the lowest excited singlet states of component molecules

1990 ◽  
Vol 94 (6) ◽  
pp. 2631-2637 ◽  
Author(s):  
Hiroyuki. Saigusa ◽  
Edward C. Lim
Keyword(s):  
Excited State ◽  
Van Der Waals ◽  
Supersonic Jets ◽  
Van Der Waals Complexes ◽  
Excited Singlet ◽  
Excited State Dynamics ◽  
Exciplex Formation ◽  
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.

Homolytic versus heterolytic cleavage for the photochemistry of 1-naphthylmethyl derivatives

1985 ◽  
Vol 63 (11) ◽  
pp. 3140-3146 ◽  
Author(s):  
B. Arnold ◽  
L. Donald ◽  
A. Jurgens ◽  
J. A. Pincock
Keyword(s):  
Excited Singlet ◽  
Triplet Energy ◽  
Heterolytic Cleavage ◽  
Exciplex Formation ◽  
Singlet States ◽  
Leaving Group ◽  
Excited Singlet States ◽  
Leaving Groups ◽  
Triplet Energy Transfer ◽  
Photochemical Cleavage

The photochemical cleavage of the 1-naphthylmethyl derivatives, 1–7, has been examined in methanol solvent under both direct and sensitized conditions. The competitition between homolytic and heterolytic cleavage as a function of multiplicity and leaving group has been studied in detail. Only substrates 1, 2, 3, and 7 react on sensitization with xanthone but evidence is presented that the resulting reactivity of 1, 2, and 3 may not be triplet energy transfer but rather exciplex formation. A semi-quantitative scale for photofugacities of the leaving groups from the excited singlet states has been established.

9,9′-Bianthryl and its van der Waals complexes studied by rotational coherence spectroscopy: Structure and excited state dynamics

2000 ◽  
Vol 113 (24) ◽  
pp. 11109-11126 ◽  
Author(s):  
Takashige Fujiwara ◽  
Yo Fujimura ◽  
Okitsugu Kajimoto
Keyword(s):  
Excited State ◽  
Van Der Waals ◽  
Van Der Waals Complexes ◽  
Excited State Dynamics ◽  
Coherence Spectroscopy

scholarly journals Rotational Coherence Spectroscopy and Excited-State Dynamics of Tolane and its Van Der Waals Complexes with Argon and Nitrogen

1994 ◽  
Vol 14 (1-3) ◽  
pp. 45-59 ◽  
Author(s):  
Shane M. Ohline ◽  
Joann Romascan ◽  
Peter M. Felker
Keyword(s):  
Excited State ◽  
Van Der Waals ◽  
Decay Process ◽  
Van Der Waals Complexes ◽  
Planar Geometry ◽  
Small Species ◽  
Excited State Dynamics ◽  
State Decay ◽  
Coherence Spectroscopy ◽  
Vibronic States

We report the results of rotational coherence spectroscopy on tolane, tolane–Ar, and tolane–N2. The results on tolane are consistent with a planar geometry for the species. They also provide information about the symmetries of excited vibronic states in the species. The results on the van der Waals complexes provide significant experimental constraints on where the small species bind to tolane. In addition, we report the observation of a rapid excited-state decay process in the complexes and discuss the possible nature of this process.

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.

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
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