scholarly journals Intramolecular Energy Transfer in Europium Chelates Due to Excitation of the Triplet State

1968 ◽  
Vol 41 (7) ◽  
pp. 1513-1518 ◽  
Author(s):  
Yoshihisa Matsuda ◽  
Shoji Makishima ◽  
Shigeo Shionoya
Keyword(s):  
Energy Transfer ◽  
Triplet State ◽  
Intramolecular Energy Transfer ◽  
Europium Chelates

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
Sign in / Sign up

Export Citation Format

Share Document