|
Type |
Poster Presentation |
Area |
Inorganic Chemistry |
Room No. |
Event Hall |
Time |
4월 19일 (목요일) 11:00~12:30 |
Code |
INOR.P-22 |
Subject |
Solvatochromic and Dual Emissive Properties of Phosphorescent Iridium(III) Cyclometalates Bearing Tethered ortho-Carborane |
Authors |
Young Hoon Lee, Heechai Lee1, Juhee Kim1, Min Hyung Lee1,* Department of Chemistry and EHSRC, University of Ulsan, Korea 1Department of Chemistry, University of Ulsan, Korea |
Abstract |
Two alkylene-tethered [R-(CBdfppy)2IrX] complexes (R = 1,6-hexanediyl, CB = o-carboran-1-yl; dfppy = 2-(2,4-difluorophenyl)-pyridinato-C2,N; X = picolinate (pic) (1) and acetylacetonate (acac) (2)) with 2-R-substituted o-carboranes at the 5-position in the phenyl ring of the dfppy ligand were prepared and characterized by X-ray diffraction studies and spectroscopic analyses. Resulting from the crystal structure of both complexes, carboranyl C‒C bond distances is comparable to that of the corresponding unlinked complexes and torsion angles between difluorophenyl and carboranyl C‒C bonds reflected the existence of π(dfppy)-σ*(C‒C) interactions. The phosphorescence efficiency of alkylene-linked complexes was higher than those of the unlinked compounds, indicative of restricted carborane rotation by alkylene chain. In addition, the efficiency varied from highly blue emissive (ΦPL= 0.92 (1) and 0.87 (2) in toluene) to poorly red emissive (ΦPL < 0.01 in DMF) depending on the dielectric constant of solvents. Interestingly, the compound 1 exhibited white emission in 1,2-dichloroethane by dual emission in the high and low energy regions, respectively derived from solvatochromism. |
E-mail |
dasis75@hanmail.net |
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