Nonparticipation of the Ligand's First Triplet State in Intramolecular Energy Transfer in Eu3+ and Tb3+ Ruhemann's Purple Complexes

1995 ◽  
Vol 99 (35) ◽  
pp. 13280-13282 ◽  
Author(s):  
Ismail Mekkaoui Alaoui
Keyword(s):  
Energy Transfer ◽  
Triplet State ◽  
Intramolecular Energy Transfer ◽  
Ruhemann’S Purple

Theoretical Evidence of the Singlet Predominance in the Intramolecular Energy Transfer in Ruhemann's Purple Tb(III) Complexes

2021 ◽  
pp. 2000304
Author(s):  
Renaldo T. Moura ◽  
Jhulie A. Oliveira ◽  
Inácio A. Santos ◽  
Ewerton M. Lima ◽  
Luís D. Carlos ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Intramolecular Energy Transfer ◽  
Theoretical Evidence ◽  
Ruhemann’S Purple

Intramolecular photosensitization of the pinene–ocimene rearrangement

2003 ◽  
Vol 81 (6) ◽  
pp. 669-672 ◽  
Author(s):  
Kevin McMahon ◽  
Peter J Wagner
Keyword(s):  
Energy Transfer ◽  
Triplet State ◽  
Uv Irradiation ◽  
Ring Opening ◽  
Para Position ◽  
Intramolecular Energy Transfer ◽  
Triplet Energy ◽  
Triplet Energy Transfer ◽  
Methylene Group

Bonding of nopol to the para position of acetophenone produces 5,5-dimethyl-2-(2-(p-acetylphenoxy)ethyl)bicyclo[3.1.1]hept-2-ene 1, which contains two chromophores: a para-alkoxyacetophenone and an α-pinene, connected by a single methylene group. UV irradiation of 1 in both benzene and methanol produces none of the intramolecular [2 + 2] cycloaddition that most para-(3-buten-1-oxy)acetophenones undergo. Instead, the pinene unit rearranges to a triene skeleton identical to that of ocimene, a known photoproduct of pinene. At modest conversion the diene portion of the triene is cis but gradually is converted to a 52:48 trans:cis ratio. It is concluded that intramolecular triplet energy transfer from the excited ketone chromophore forms the 1,2-biradical triplet state of the pinene moiety, which then undergoes cyclobutylcarbinyl ring opening to a 1,4-biradical that cleaves to the 1,3,6-triene structure of ocimene. This mechanism is suggested to be responsible for the earlier reported intermolecularly sensitized rearrangement of α-pinene to the ocimene isomers.Key words: intramolecular energy transfer, triplet pinene, cyclobutylcarbinyl ring opening, photosensitization.

Delocalized Excitation or Intramolecular Energy Transfer in Pyrene Core Dendrimers

2021 ◽  
pp. 7717-7725
Author(s):  
Dayujia Huo ◽  
Minjie Li ◽  
Zujin Zhao ◽  
Xian Wang ◽  
Andong Xia ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Intramolecular Energy Transfer
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