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The polarized absorption, fluorescence and phosphorescence spectra of 1,3-diazaazulene

✍ Scribed by Francis P. Burke; Gerald J. Small; James R. Braun; Tien-Sung Lin

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
513 KB
Volume
19
Category
Article
ISSN
0009-2614

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✦ Synopsis

From mixed crystal polarization studies, the lolvesr energy absorption system of 1,3-diazaazulene (cyclohcptimidrrzole) at 4500 A is assigned 3s ' Br (Rn*j + 'At. The Bt symmetry and oscillator strength of the 4500 A state, together with polarization data on other azaazulenes, clearly indicate a correspondence with the 7000 A state of azulene.

The anomalously large blue shift of the letter state in 1,3-diazaazuiene results in a return to radiative normality in that the observed fluorescence originates from the lowest singlet. Phosphorescence is also observed, originating nt 5200 A from a state assigned as XZ*.

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