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  4. Bis(pyrazol-1-yl)methane as Non-Chromophoric Ancillary Ligand for Charged Bis-Cyclometalated Iridium(III) Complexes
 
research article

Bis(pyrazol-1-yl)methane as Non-Chromophoric Ancillary Ligand for Charged Bis-Cyclometalated Iridium(III) Complexes

Meng, Sheng
•
Jung, Il  
•
Feng, Jie
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2012
European Journal Of Inorganic Chemistry

New charged cyclometalated iridium(III) complexes Ir(ppy)2(L) [ppy = 2-phenylpyridine; L = bis(pyrazol-1-yl)methane (for 1); L = bis(3,5-dimethylpyrazol-1-yl)methane (for 2)] were synthesized and their electrochemical and photophysical properties studied. These complexes with non-p-electron-conjugated ancillary chelates exhibit significantly blueshifted emission relative to those of commonly used derivatives with NN ancillary ligands such as bipyridine or phenanthroline. Both X-ray and theoretical analysis based on time-dependent density functional theory (TD-DFT) reveal that the binding of Ir to the bis(pyrazol-1-yl)methane ancillary ligand is much weaker than that to the phenylpyridine main ligand; the effect is enhanced in the excited state. As a result, the ancillary ligand does not participate in low-energy excitations and triplet emission, and the electronic transitions are concentrated on the main chromophoric ligands. The blueshift feature is attributed to emission originating from the main cyclometalated ligands, in contrast to emitters with the NN chromophoric ancillary ligand. In addition, complex 2 exhibits a one order of magnitude higher non-radiative decay rate than complex 1, which is attributed to the steric hindrance of the methyl groups that leads to a more loosely bound ancillary ligand.

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Type
research article
DOI
10.1002/ejic.201200197
Web of Science ID

WOS:000305506800013

Author(s)
Meng, Sheng
Jung, Il  
Feng, Jie
Scopelliti, Rosario  
Di Censo, Davide  
Graetzel, Michael  
Nazeeruddin, M. Khaja  
Baranoff, Etienne  
Date Issued

2012

Publisher

Wiley-Blackwell

Published in
European Journal Of Inorganic Chemistry
Start page

3209

End page

3215

Subjects

Iridium

•

Luminescence

•

Density functional calculations

•

Pyrazole

•

Molecular modeling

•

Emitting Electrochemical-Cells

•

Photophysical Properties

•

Ir(Iii) Complexes

•

Blue-Green

•

Light

•

Phosphorescent

•

Derivatives

•

Emitters

•

Design

•

Color

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPI  
Available on Infoscience
July 13, 2012
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/83842
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