Higher Triplet Excited States of Benzophenones and Bimolecular Triplet Energy Transfer Measured by Using Nanosecond-Picosecond Two-Color/Two-Laser Flash Photolysis

The dynamics of naphthalene derivatives with different hydrophobicities bound to F127 polyethyleneoxide-polypropyleneoxide-polyethyleneoxide (PEO-PPO-PEO) micelles in the gel and sol phases were studied using a quenching methodology for the triplet excited states of the naphthalenes. Studies with triplet excited states probe a larger reaction volume than the volumes accessible when using fluorescent singlet excited states. The use of triplet excited states enables the determination of the dynamics between different compartments of a supramolecular system, which in the case of F127 micelles are the micellar core, the micellar corona and the aqueous phase. This report includes laser flash photolysis studies for the four naphthalene derivatives in the F127 gel and sol phases. The triplet excited states were quenched using the nitrite anion as the quenchers. The association and dissociation rate constants of the naphthalenes from the micelles and the quenching rate constants for the naphthalenes bound to the micelles were determines from the curved quenching plot (observed decay rate constant vs. nitrite concentration).

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Rate Constant of Bimolecular Triplet Energy Transfer from Chrysene in the Higher Triplet Excited States

The Journal of Physical Chemistry A ◽

10.1021/jp0479771 ◽

2004 ◽

Vol 108 (35) ◽

pp. 7147-7150 ◽

Cited By ~ 2

Author(s):

Xichen Cai ◽

Masanori Sakamoto ◽

Michihiro Hara ◽

Sachiko Tojo ◽

Kiyohiko Kawai ◽

...

Keyword(s):

Energy Transfer ◽

Excited States ◽

Rate Constant ◽

Triplet Energy ◽

Triplet Excited States ◽

Triplet Energy Transfer

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Preparation of Bodipy–ferrocene dyads and modulation of the singlet/triplet excited state of bodipy via electron transfer and triplet energy transfer

Journal of Materials Chemistry C ◽

10.1039/c5tc01222h ◽

2016 ◽

Vol 4 (14) ◽

pp. 2843-2853 ◽

Cited By ~ 22

Author(s):

Xueyan Wu ◽

Wenting Wu ◽

Xiaoneng Cui ◽

Jianzhang Zhao ◽

Mingbo Wu

Keyword(s):

Electron Transfer ◽

Energy Transfer ◽

Excited State ◽

Excited States ◽

Singlet Excited State ◽

Triplet Excited State ◽

Triplet Energy ◽

Triplet Excited States ◽

Triplet Energy Transfer

Bodipy–ferrocene dyads were prepared for reversible electrochemical switching of the singlet excited state (fluorescence), as well as the triplet excited states of Bodipy.

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Triplet state of orotic acid and orotic acid methyl ester in solution

Canadian Journal of Chemistry ◽

10.1139/v70-162 ◽

1970 ◽

Vol 48 (6) ◽

pp. 987-999 ◽

Cited By ~ 9

Author(s):

R. W. Yip ◽

W. D. Riddell ◽

A. G. Szabo

Keyword(s):

Methyl Ester ◽

Excited States ◽

Orotic Acid ◽

Flash Photolysis ◽

Acid Methyl Ester ◽

Kcal Mole ◽

Triplet Energy ◽

Acid Methyl ◽

Triplet Excited States ◽

Triplet Energy Transfer

Flash photolysis of orotic acid and orotic acid methyl ester in aqueous solution was studied. The transients were identified as triplet excited states on the basis of their lifetimes, sensitization, quenching, and self-quenching experiments. The rate constants for self-quenching and for decay of the triplet were measured and discussed in terms of dimerization and competing unimolecular and pseudo-unimolecular processes. A triplet energy of 60 kcal mole−1 was deduced for both orotic acid and orotic acid methyl ester from triplet energy transfer measurements.

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