Triplet state sensitization of covalently linked hybrid porphyrin dimers. Evidence for intramolecular triplet energy transfer. [Free base tetraphenylporphyrin and zinc tetraphenylporphyrin]

Journal Article · Thu Jan 01 04:00:00 EST 1987 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100285a006· OSTI ID:6540231

Levanon, H; Regev, A; Das, P K

Triplet sensitization of covalently linked hybrid porphyrin dimers, in pulsed radiolysis solutions, allows monitoring intramolecular triplet energy transfer. Results for two dimers are reported: the para-para and ortho-ortho of Zn(-CH/sub 2/-)/sub 3/H/sub 2/, where the Zn and H/sub 2/ are the tetratosyl, zinc, and free base, porphyrin chromophores. The results for the intramolecular rates are k/sub et//sup para-para/ = (2.6-10) x 10/sup 5/ s/sup -1/ and k/sub et//sup ortho-ortho/ > 10 x 10/sup 5/ s/sup -1/. The pseudo-first-order rates for sensitization are k/sup ortho-ortho/ = 1.8 x 10/sup 5/ s/sup -1/ and k/sup para-para/ > 1.8 x 10/sup 5/ s/sup -1/.

• Research Organization: Univ. of Notre Dame, IN
• OSTI ID: 6540231
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 91:1; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400600 -- Radiation Chemistry
ABSORPTION SPECTROSCOPY
CARBOXYLIC ACIDS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
DATA
DE-EXCITATION
DECOMPOSITION
DIMERS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
KINETICS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PORPHYRINS
PULSE TECHNIQUES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONLESS DECAY
RADIOLYSIS
REACTION KINETICS
SPECTRA
SPECTROSCOPY
VISIBLE SPECTRA