TY - JOUR
T1 - Bimanes VIII
T2 - Photophysical properties of syn- and anti-1,5-diazabicyclo[3.3.0] octadienediones (9,10-dioxabimanes)
AU - Kosower, Edward M.
AU - Kanety, Hannah
AU - Dodiuk, Hanna
PY - 1983
Y1 - 1983
N2 - Photophysical data for syn- and anti-1,5-diazabicyclo[3.3.0] octadienediones (9,10-dioxabimanes ((R2, R1)B)), a new class of small heterocyclic molecules, are reported. The syn and anti isomers differ greatly in the positions of the absorption maxima (λmax(syn) ≫ λmax(anti)), the solvent sensitivities of the absorption maxima (that of the syn isomer is greater than that of the anti isomer), the fluorescence quantum yields (φF(syn) ≫ φF (anti)), the phosphorescence quantum yields (φP(syn) ≪ φP(anti)), but they exhibit similar changes in some of these properties with respect to changes in substitution. The 4,6-bridged syn-bimanes absorb at shorter wavelengths than unbridged compounds do, but they fluoresce at similar wavelengths. The phosphorescence of the anti-(R2, R1)B appears at shorter wavelengths and has a somewhat shorter lifetime than that of the corresponding syn-(R2, R1)B.
AB - Photophysical data for syn- and anti-1,5-diazabicyclo[3.3.0] octadienediones (9,10-dioxabimanes ((R2, R1)B)), a new class of small heterocyclic molecules, are reported. The syn and anti isomers differ greatly in the positions of the absorption maxima (λmax(syn) ≫ λmax(anti)), the solvent sensitivities of the absorption maxima (that of the syn isomer is greater than that of the anti isomer), the fluorescence quantum yields (φF(syn) ≫ φF (anti)), the phosphorescence quantum yields (φP(syn) ≪ φP(anti)), but they exhibit similar changes in some of these properties with respect to changes in substitution. The 4,6-bridged syn-bimanes absorb at shorter wavelengths than unbridged compounds do, but they fluoresce at similar wavelengths. The phosphorescence of the anti-(R2, R1)B appears at shorter wavelengths and has a somewhat shorter lifetime than that of the corresponding syn-(R2, R1)B.
UR - http://www.scopus.com/inward/record.url?scp=49049124511&partnerID=8YFLogxK
U2 - 10.1016/0047-2670(83)80020-3
DO - 10.1016/0047-2670(83)80020-3
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AN - SCOPUS:49049124511
SN - 0047-2670
VL - 21
SP - 171
EP - 182
JO - Journal of Photochemistry
JF - Journal of Photochemistry
IS - 2
ER -