Journal
MOLECULAR PHYSICS
Volume 100, Issue 9, Pages 1385-1394Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00268970110117917
Keywords
-
Ask authors/readers for more resources
This paper reports the excited quartet (S = 3/2) and quintet (S = 2) states arising from the intramolecular radical-triplet pair in the purely organic pi conjugated spin systems. A previous paper reported the excited quartet and quintet states of 9-anthracene-(4-phenyliminonitroxide) and 9,10-anthracene-bis(4-phenyliminonitroxide), respectively, in which iminonitroxide radicals are linked to the phenyl- or diphenylanthracene moiety (a spin-coupler) through the pi conjugation. The similar excited quartet and quintet states were observed for the 9-anthracene-( 4-phenylverdazyl) radical (1) and 9, 10-anthracene-bis(4-phenylverdazyl) diradical (2) by time resolved electron spin resonance (TRESR). The TRESR spectrum was analysed by the ordinary spin Hamiltonian with the Zeeman and fine structure terms. For the quartet state of 1, the g value, fine structure splitting, and relative population of the M-s sublevels have been determined to be g = 2.0035; D = 0.0230 cm(1), E = 0.0, P-1/2' = P-1/2' = 0.5 and P-3/2' = P-3/2' 0.0, respectively, by spectral simulation. The spin Hamiltonian parameters of the quintet state of 2 were determined to be g = 2.0035, D = 0.0128 cm(1), E = 0.0, P-2' = P-2' = 0.0, P-1' = P-1' = 0.37 and P-0' = 0.26, respectively. Direct observation of the excited high spin state showed that photoinduced intramolecular spin alignment is realized between the excited triplet state (S = 1) of the phenyl- or diphenylanthracene moiety and the doublet spin (S = 1/2) of the dangling verdazyl radicals. Ab initio MO calculations (DFT) were carried out in order to clarify the mechanism of the photoinduced spin alignment.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available