✦ LIBER ✦

Picosecond laser studies of the charge-transfer reaction of excited triplet diphenylcarbene with electron donors

✍ Scribed by E.V. Sitzmann; J. Langan; K.B. Eisenthal

Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 509 KB
Volume: 102
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(83)87443-0

No coin nor oath required. For personal study only.

✦ Synopsis

C\ idence of a one-electron transfer process in a carbene reaction has been observed for the first time. The exunple is the quench;ng of the photoescited triplet state of diphenylcarbene (3*DPC) by electron donors. Measurement of the fluorescence lifetime as a function of donor concentration yielded the bimolecuIar rate constant, 3*k. An explanation is offered as to U 11y 3*DPC and ' DPC react efticicntl~ with amines as well as alcohols. whereas the ground triplet, 3DPC, does not.

📜 SIMILAR VOLUMES

Picosecond laser studies of the effects

Picosecond laser studies of the effects of reactants on intramolecular energy relaxation of diphenylcarbene: Reaction of diphenylcarbene with alcohols

✍ E.V. Sitzmann; J.G. Langan; K.B. Eisenthal 📂 Article 📅 1984 🏛 Elsevier Science 🌐 English ⚖ 523 KB

Picosecond laser induced fluorescence measurements provide for the first time the direct meanrrement of the intramolccular and intermolecular energy decay dynamics of singlet diphenylcarbene (' DPC) in the presence of reactive molecules. As exemplified by the reaction of ' DPC with alcohols it is fo

Dynamics of charge transfer in the excit

Dynamics of charge transfer in the excited amine complexes of the fullerenes C60 and C70.: A picosecond laser flash photolysis study

✍ D.K. Palit; H.N. Ghosh; H. Pal; A.V. Sapre; J.P. Mittal; Ram Seshadri; C.N.R. Ra 📂 Article 📅 1992 🏛 Elsevier Science 🌐 English ⚖ 353 KB

In benzene solution, C60 and C7o interact weakly in the ground state with amines having favourable oxidation potentials. Picosecond time-resolved absorption measurements show that on photoexcilation, the weak complexes undergo charge separation to produce ion pairs which in turn undergo fast geminat

Intramolecular 2pπ* → 3dπ charge transfe

Intramolecular 2pπ* → 3dπ charge transfer in the excited state of phenyldisilane studied by picosecond and nanosecond laser spectroscopy

✍ Haruo Shizuka; Katsuhiko Okazaki; Masayuki Tanaka; Mitsuo Ishikawa; Minoru Sumit 📂 Article 📅 1985 🏛 Elsevier Science 🌐 English ⚖ 366 KB

In~mol~~ 2pn\* + 3dn charge transfer in the excited state of phenyl~e occurs very rapidly (<IO ps) both in ?&Fat 293 K and in EPA glass at 77 K. At room temperature a Iong;lived 425 nm transient (which is assgned to a reananged intermediate) is produced with a nse time of 30 ps, showing that the tra

ESR study of the hyperfine structure of

ESR study of the hyperfine structure of the triplet state in crystalline donor acceptor complexes: A probe for the degree of charge transfer in the excited state

✍ N.S. Dalal; D. Haarer; J. Bargon; H. Möhwald 📂 Article 📅 1976 🏛 Elsevier Science 🌐 English ⚖ 461 KB

The hyperfine tensors of the triplet states of several guest donor molecules in naphthaleneitetracyanobenzene host crystals have been measured by EPR s~ctroscopy. From these data the degree of charge transfer (6') in the excited state can be derived. in a straightforward way. Whereas anthracene yieI

Picosecond-nanosecond laser photolysis s

Picosecond-nanosecond laser photolysis studies on the photochemical reaction of excited benzophenone with 1,4-diazabicyclo[2.2.2]octane in acetonitrile solution: proton abstraction of the free benzophenone anion radical from the ground state amine

✍ Hiroshi Miyasaka; Kazuhiro Morita; Kenji Kamada; Noboru Mataga 📂 Article 📅 1991 🏛 Elsevier Science 🌐 English ⚖ 588 KB

Picosecond and nanosecond dynamics of the ion pair produced by the electron transfer reaction between the triplet state benzophenone ('BP\*) and 1,4-diazabicyclo[ 2.2.2loctane (DABCO) wasinvestigated by means oftransientabsorption spectroscopy and laser-induced photoconductivity measurement. It has