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Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
Published on: October 24, 2017
Thermally activated delayed fluorescent (TADF) coordination polymer with the generation of singlet oxygen
Xiu Hui Ren1, Gang Yuan Li1, Hua Du1
1College of Chemistry Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes Ministry of Education, Shandong Normal University, Jinan 250014, People's Republic of China.
Abstract:
4,4'-{9,9'-Spirobi[10H-acridine]-10,10'-diyl}dibenzoic acid (L, C29H26N2O4) was designed and synthesized as a new donor-acceptor motif molecule. Due to the large dihedral angle between the planes of the carboxyphenyl group and the spiroacridine moiety, L possess thermally activated delayed fluorescence (TADF). By applying L as a ligand and using Cd as a metal connector, we synthesized the coordination polymer catena-poly[hemi-μ-aqua-aqua(μ3-4,4'-{9,9'-spirobi[10H-acridine]-10,10'-diyl}dibenzoato)cadmium(II)], [Cd(C29H24N2O4)(H2O)1.5]n, (I). X-ray crystallographic analysis revealed that this coordination polymer exhibits one-dimensional chains constructed from molecular twist-ring moieties, with Cd2O11 clusters as the connection nodes. The stacking pattern of the two-dimensional network was formed by C-H...π interactions in the solid state. Similar to L, (I) presents a sky-blue TADF emission, together with a photoluminescence quantum yield (PLQY) of 40%. It is worth noting that the photocatalytic activity toward the generation of singlet oxygen of this coordination polymer is confirmed.
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