A large solvent polarity effect on the rate of singlet to triplet intersystem crossing (ksT) has been observed in the carbenes, diphenylcarbene (DPC) and dicycloheptadienylidene (DCHD)-it is found that both ksT and the energy splitting (A&T) separtaing the singlet and triplet states decrease as the
Picosecond study of the intersystem crossing in aromatic ketone vapors
โ Scribed by N.A. Borisevich; Yu.I. Bubekov; G.B. Tolstorozhev; Yu. Vishchakas; V. Kabelka; A. Milyauskas
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 258 KB
- Volume
- 103
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
โฆ Synopsis
An automatic laser spectrometer was used directly to measure time characteristics of triplet-triplet absorption optical density build-up in 4-phenylbenzophenone
vapor. An estimation of the intramolecular intersystem crossing rate constant is given in the picosecond time range. Differences in intramolecular intersystem crossing rate constants have been observed in 4phenylberuophenone in the condensed and gas phases.
๐ SIMILAR VOLUMES
The singlet to triplet intersystem crossing rate (&) for a series of diphenylcarbene derivatives is found to be a sensitive function of the energy splitting (AEsT), which in turn depends on the solvent polarity and on the structure ofthe carbene. A turn-over in the dependence of ksr on AEsT is found
We des'cribe results from a continuing study of excited state rel&~aticn processes in @yo~~lr @XiCXXO~ Chat demcmsQat$ the reSonZnt or small mobx& limit of a nonradiat&ve transitfon. fntersystem crossing from the excited singlet (I&) state to a triplet state (presumably the %u state) is shown to be
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
Picosecond and nanosecond irradiation studrcs of the planar, title complcv suggest the nptd (10 ps) formation of a tqlet, tetrahedrally distorted cxcttcd state which m CH,CN undergoes tempcraturc-utdcpcndcnt attack by solvent (T -CO 91 ns) to give an ioruc species whale in CH&. trIplet -L smglct mtc
The intersystem crossing decay constants from the 3Bzu state into the ground state of anthrauxeil~o in a phenzzine crystal have been determined by magnetic resanmae techniques nt lSยฐK both nt hisI\_ magnetic field and, by a parameterization procedure, at zzo magnetic fie!d, A comparison of the anthr