Singlet biradical{yields}singlet zwitterion optical transition in a twisted olefin

Journal Article · Wed Sep 18 04:00:00 EDT 1996 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja961829+· OSTI ID:422077

Piotrowiak, P; Strati, G ^[1]; Smirnov, S N ^[2]; Warman, J M; Schuddeboom, W ^[3]

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1. Univ. of New Orleans, LA (United States)
2. Dartmouth Colege, Hanover, NH (United States)
3. Delft Univ. of Technology (Netherlands)

We report the first direct observation of the singlet biradical $YLD singlet zwitterion transition in a twisted olefin, biphenanthrenylidene. Biphenanthrenylidene (full name, bi-4H-cyclopenta[def]phenanthren-4-ylidene, abbreviated as BPH) is an analogue of tetraphenylethylene (TPE) and stilbene, both of which are the favorite models of photoisomerization reactions. The investigations have been focusing on the dynamics of the twisting motion of the double bond which leads to decoupling of the two halves of the olefin and results in the formation of the D{sub 2d} 90{degree}-twisted zwitterionic or biradical excited state. 13 refs., 2 figs., 1 tab.

• OSTI ID: 422077
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 37 Vol. 118; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ABSORPTION SPECTRA
ALKENES
CHEMICAL BONDS
EMISSION SPECTRA
FLUORESCENCE
IONS
OPTICAL PROPERTIES
RADICALS