Construction and characterization on composite electrospinning fibers doped with iridium complex owing fluorine atoms in its auxiliary ligand.
The authors synthesized a fluorine-containing Ir(III) complex Ir(PTZ)2(HFD) and the corresponding composite electrospinning fibers PVP@Ir(PTZ)2(HFD), where PTZ, HFD and PVP stood for 2-phenylbenzo[d]thiazole, 1,1,1,5,5,5-hexafluoropentane-2,4-dione and poly(vinylpyrrolidone), respectively. The molecular structure of the Ir(III) complex was confirmed by its single crystal analysis, which suggested that Ir(PTZ)2(HFD) molecules crystallized as monoclinic system with two molecules in each unit cell. Density functional theory calculation on the crystal revealed that the onset electronic transitions possessed a mixed character of metal-to-ligand-charge-transfer (MLCT) and ligand-to-ligand-charge-transfer (LLCT). Ir(PTZ)2(HFD) was then doped into electrospinning fibers so that the photophysical comparison between bulk Ir(PTZ)2(HFD) and composite samples could be performed. It was found that both face-to-face π-π attraction in crystal and the immobilization in PVP host could improve photoluminescence performance by restraining the geometric relaxation of MLCT excited state, showing emission blue shift, longer excited state lifetime and improved photostability.
['Gao|Yu-Qian|YQ|', 'Zhang|Shimin|S|', 'Wang|Pengju|P|', 'Xu|Shuxia|S|', 'Wu|Kun|K|', 'Mou|Wanzhi|W|']
D056831:Coordination Complexes D003460:Crystallization D018360:Crystallography, X-Ray D055664:Electrochemical Techniques D005461:Fluorine D054879:Halogenation D007495:Iridium D008024:Ligands D049449:Luminescence D055616:Microtechnology D008958:Models, Molecular D010420:Pentanes D011205:Povidone D013844:Thiazoles
Iridium complex Crystal Photoluminescence Microfiber