Triplet state sensitization of covalently linked hybrid porphyrin dimers. Evidence for intramolecular triplet energy transfer

1987 ◽  
Vol 91 (1) ◽  
pp. 14-16 ◽  
Author(s):  
Haim. Levanon ◽  
Ayelet. Regev ◽  
P. K. Das
Keyword(s):  
Energy Transfer ◽  
Triplet State ◽  
Triplet Energy ◽  
Covalently Linked ◽  
Triplet Energy Transfer ◽  
Porphyrin Dimers

Triplet Energy Transfer in Porphyrin Dimers:  Comparison between π- and σ-Chromophore Bridged Systems

2000 ◽  
Vol 122 (40) ◽  
pp. 9844-9845 ◽  
Author(s):  
Joakim Andréasson ◽  
Johan Kajanus ◽  
Jerker Mårtensson ◽  
Bo Albinsson
Keyword(s):  
Energy Transfer ◽  
Triplet Energy ◽  
Triplet Energy Transfer ◽  
Porphyrin Dimers

Triplet–Triplet Energy Transfer as a Reason for Quenching by Thionine of the Triplet State of Eosin in Complexes with Cucurbit[7, 8]urils in Water

2019 ◽  
Vol 53 (1) ◽  
pp. 22-25 ◽  
Author(s):  
T. V. Fedotova ◽  
V. N. Gutrov ◽  
G. V. Zakharova ◽  
A. K. Chibisov ◽  
M. V. Alfimov
Keyword(s):  
Energy Transfer ◽  
Triplet State ◽  
Triplet Energy ◽  
Triplet Energy Transfer

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.

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