Record number :
Title of article :
Effect of N-methyl and ethyl on phosphorescence of carbazole in cocrystals assembled by CI⋯π halogen bond, π-hole⋯π bond and other interactions using 1,4-diiodotetrafluorobenzene as donor
Author/Authors :
Zhu، نويسنده , , Qing and Gao، نويسنده , , Yuan Jun and Gao، نويسنده , , Hai Yue and Jin، نويسنده , , Wei Jun، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
Pages :
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Abstract :
Two phosphorescent cocrystals were prepared by 1,4-diiodotetrafluorobenzene (1,4-DITFB) and N-methylcarbazole (cocrystal 1) and N-ethylcarbazole (cocrystal 2) based on CI⋯π halogen bond, π-hole (πh)⋯π bond and CH⋯π, CH⋯F hydrogen bond as well as F⋯F contacts, in which 1,4-DITFB molecule acts simultaneously as the cement to link luminescence molecules and the heavy atom perturber to enhance phosphorescence of emitters by spin–orbital coupling. The cocrystals were also well characterized by powder XRD, FT-IR, Raman, DSC and DTA analysis and also estimated the bonding energies by calculation. Different steric effects of N-substituted groups on the carbazole backbone leads to the different CI⋯π bonding stoichiometry and π-hole⋯π bonding modes and then lead to the phosphorescence spectra red- or blue-shift compared with carbazole-1,4-diiodotetrafluorobenzene cocrystal.
Keywords :
Modulated phosphorescence , CI?? halogen bond , ?-hole?? bond , Steric effect
Journal title :
Journal of Photochemistry and Photobiology:A:Chemistry
Link To Document :