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.
College of Life Sciences, Henan Agricultural University, 95 Wenhua Road, Zhengzhou 450002, China; Key Laboratory of Enzyme Engineering of Agricultural Microbiology, Ministry of Agriculture, Henan Agriculture University, Henan 450002, China.
Yu-Qian
YQ
Gao
College of Life Sciences, Henan Agricultural University, 95 Wenhua Road, Zhengzhou 450002, China; Key Laboratory of Enzyme Engineering of Agricultural Microbiology, Ministry of Agriculture, Henan Agriculture University, Henan 450002, China.
Shimin
S
Zhang
College of Life Sciences, Henan Agricultural University, 95 Wenhua Road, Zhengzhou 450002, China; Key Laboratory of Enzyme Engineering of Agricultural Microbiology, Ministry of Agriculture, Henan Agriculture University, Henan 450002, China.
Pengju
P
Wang
College of Life Sciences, Henan Agricultural University, 95 Wenhua Road, Zhengzhou 450002, China; Key Laboratory of Enzyme Engineering of Agricultural Microbiology, Ministry of Agriculture, Henan Agriculture University, Henan 450002, China.
Shuxia
S
Xu
College of Life Sciences, Henan Agricultural University, 95 Wenhua Road, Zhengzhou 450002, China; Key Laboratory of Enzyme Engineering of Agricultural Microbiology, Ministry of Agriculture, Henan Agriculture University, Henan 450002, China. Electronic address: wukun218@163.com.
Kun
K
Wu
College of Chemistry and Molecular Engineering, Tsinghua University, Beijing 100871, China.
Wanzhi
W
Mou
D056831:Coordination Complexes / Q000737:chemistry*; D003460:Crystallization; D018360:Crystallography, X-Ray; D055664:Electrochemical Techniques; D005461:Fluorine / Q000737:chemistry*; D054879:Halogenation; D007495:Iridium / Q000737:chemistry*; D008024:Ligands; D049449:Luminescence; D055616:Microtechnology; D008958:Models, Molecular; D010420:Pentanes / Q000737:chemistry*; D011205:Povidone / Q000737:chemistry*; D013844:Thiazoles / Q000737:chemistry*
D056831:Coordination Complexes; D008024:Ligands; D010420:Pentanes; D013844:Thiazoles; D005461:Fluorine; D007495:Iridium; D011205:Povidone
Crystal; Iridium complex; Microfiber; Photoluminescence