✦ LIBER ✦

The effect of molecular distortion in the rates of intersystem crossing S1 Tx S0 processes

✍ Scribed by C.T. Lin; Jim A. Stikeleather

Publisher: Elsevier Science
Year: 1976
Tongue: English
Weight: 666 KB
Volume: 38
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(76)80040-1

No coin nor oath required. For personal study only.

✦ Synopsis

It is shown that the interpretation of the experimental observations of Dewey and Hadley that led to the conclusion of the unexpectedly inefficient intersystem crossing St -TX process in 9,10-phenanthroline, and which prompted a new propeal by Azumi for the mechanism of intersystem crossing in N-heterocyclics is incorrect. The intersystem crossing process in aromatic hydrocarbons and the N-heterocyclics is briefly discussed and compared. The results indicate that the out-ofplane molecular distortions enhance the rate of intersystem crossing, S1 -TX, mainly through'electronic mixing and not the vibrational overiap integrals. The lack of phosphorescence emission for 9,10-phenanthroline in hydrocarbon solvents is attributed to a fast non-radiative Tl -So channel resulting from the pseudo-Jahn-Teller effect.

📜 SIMILAR VOLUMES

The mechanism of the S1 ⇝ Tx intersystem

The mechanism of the S1 ⇝ Tx intersystem crossing process in aromatic hydrocarbons from PMDR

✍ M.A. El-Sayed; W.R. Moomaw; J.B. Chodak 📂 Article 📅 1973 🏛 Elsevier Science 🌐 English ⚖ 563 KB

Using symmetry selection rules it is shown that the S r + TX intersystem crossing (ISC) process in (;:on-rotating) platrar condensed aromatic compounds with lowest states of the X,ZI \* type leads to triplet states with the two unpaired electrons spinning in the molecular plane. Out-of-plane distort

Qualitative considerations of the T1 → S

Qualitative considerations of the T1 → S0 intersystem crossing in benzene

✍ B. Scharf 📂 Article 📅 1979 🏛 Elsevier Science 🌐 English ⚖ 309 KB

Triplet spin-sublevel selectivity of the

Triplet spin-sublevel selectivity of the S1—T1 intersystem crossing in trans-stilbene

✍ Takeshi Ikeyama; Tohru Azumi 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 328 KB

The role of franck-condon factors in int

The role of franck-condon factors in intersystem crossing from the S1 state of anthracene

✍ Fujio Tanaka; Jiro Osugi 📂 Article 📅 1974 🏛 Elsevier Science 🌐 English ⚖ 487 KB

Effects of clustering of rare-gas atoms

Effects of clustering of rare-gas atoms on the rate of S1T2 intersystem crossing for 9-methylanthracene

✍ Fujio Tanaka; Yoshito Tanaka; Satoshi Hirayama; Mitsuhiko Kono; Kosuke Shobatake 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 384 KB

Laser induced fluorescence excitation spectra for 9-methylanthracene (MEA) in a supersonic free jet were measured as a function of the stagnation pressure of Ar, Kr and Xe, used as carrier gas. The 0-0 excitation bands for complexes of type MEA-Ar n were observed successively corresponding to an inc

Zeeman effect of the PMDR signal and the

Zeeman effect of the PMDR signal and the mechanism of the intersystem crossing process in pyrazine at 1.6 K

✍ Paul E. Zinsli; M.A. El-Sayed 📂 Article 📅 1975 🏛 Elsevier Science 🌐 English ⚖ 436 KB

The observed change in the 10.38 GHz PhlDR signal of pyrazine in durene at 1.6 K upon the appliation of a magnetic fieid of O-500 G cannot be explained by the direct Sl(n, n\*) l---f T1 (n, rr\*) intersystem crossing process. The observed re- sults an be computer fitted if the crossing is assumed to