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Iridium Cyclometalates with Tethered o-Carboranes: Impact of Restricted Rotation of o-Carborane on Phosphorescence Efficiency

Title
Iridium Cyclometalates with Tethered o-Carboranes: Impact of Restricted Rotation of o-Carborane on Phosphorescence Efficiency
Author
이상욱
Keywords
C-C DISTANCE; RED PHOSPHORESCENCE; POLYHEDRAL BORANES; COMPLEXES; DERIVATIVES; LIGAND; ORGANOBORANES; SUBSTITUTION; PHOTOPHYSICS; AROMATICITY
Issue Date
2015-07
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v. 137, NO 25, Page. 8018-8021
Abstract
Iridium(III) cyclometalates (1c and 2c) in which the two carborane units on the 4- or 5-positions of 2-phenylpyridine (ppy) ligands were tethered by an alkylene linker were prepared to investigate the effect of free rotation of o-carborane on phosphorescence efficiency. In comparison with the unlinked complex, tethering the o-carboranes to the 5-positions of ppy ligands (2c) enhanced phosphorescence efficiency by over 30-fold in polar medium (Phi(PL) = 0.37 vs 0.011 in THF), while restricting the rotation of o-carborane at the 4-positions (1c) negatively affected the phosphorescence efficiency. The different effects of restricted rotation of o-carborane on phosphorescence efficiency were likely a result of the different variations of the carboranyl C-C bond distances in the excited state.
URI
http://pubs.acs.org/doi/abs/10.1021/jacs.5b04576http://hdl.handle.net/20.500.11754/26632
ISSN
0002-7863
DOI
10.1021/jacs.5b04576
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Articles
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