Abstract
The intermolecular interaction and aggregation of the neutral complex fac-tris(2-phenylpyridinato-C2,N)iridium(III) (fac-Ir(ppy) 3) in solution was investigated. Intermolecular interactions were found to effectively decrease the luminescence lifetime via self-quenching with increasing fac-Ir(ppy)3 concentrations. A Stern-Volmer plot for quenching in acetonitrile was linear, due to bimolecular self-quenching, but curved in toluene as the result of excimer formation. 1H NMR spectra demonstrated a monomer-aggregate equilibrium which resulted in spectral shifts depending on solvent polarity. X-ray crystallography provided structural information concerning the aggregate, which is based on a tetramer consisting of two Δ-fac-Ir(ppy)3-Λ-fac-Ir(ppy)3 pairs. Offset π-π stacking of ppy ligands and electrostatic dipole-dipole interactions between complex molecules play an important role in the formation of these molecular pairs.
| Original language | English |
|---|---|
| Pages (from-to) | 9449-9456 |
| Number of pages | 8 |
| Journal | Journal of Physical Chemistry B |
| Volume | 117 |
| Issue number | 32 |
| DOIs | |
| Publication status | Published - Aug 15 2013 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Materials Chemistry
- Surfaces, Coatings and Films
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Intermolecular interactions and aggregation of fac -Tris(2- phenylpyridinato- C 2, N)iridium(III) in nonpolar solvents. / Takayasu, Satoshi; Suzuki, Takayoshi; Shinozaki, Kazuteru.
In: Journal of Physical Chemistry B, Vol. 117, No. 32, 15.08.2013, p. 9449-9456.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Intermolecular interactions and aggregation of fac -Tris(2- phenylpyridinato- C 2, N)iridium(III) in nonpolar solvents
AU - Takayasu, Satoshi
AU - Suzuki, Takayoshi
AU - Shinozaki, Kazuteru
PY - 2013/8/15
Y1 - 2013/8/15
N2 - The intermolecular interaction and aggregation of the neutral complex fac-tris(2-phenylpyridinato-C2,N)iridium(III) (fac-Ir(ppy) 3) in solution was investigated. Intermolecular interactions were found to effectively decrease the luminescence lifetime via self-quenching with increasing fac-Ir(ppy)3 concentrations. A Stern-Volmer plot for quenching in acetonitrile was linear, due to bimolecular self-quenching, but curved in toluene as the result of excimer formation. 1H NMR spectra demonstrated a monomer-aggregate equilibrium which resulted in spectral shifts depending on solvent polarity. X-ray crystallography provided structural information concerning the aggregate, which is based on a tetramer consisting of two Δ-fac-Ir(ppy)3-Λ-fac-Ir(ppy)3 pairs. Offset π-π stacking of ppy ligands and electrostatic dipole-dipole interactions between complex molecules play an important role in the formation of these molecular pairs.
AB - The intermolecular interaction and aggregation of the neutral complex fac-tris(2-phenylpyridinato-C2,N)iridium(III) (fac-Ir(ppy) 3) in solution was investigated. Intermolecular interactions were found to effectively decrease the luminescence lifetime via self-quenching with increasing fac-Ir(ppy)3 concentrations. A Stern-Volmer plot for quenching in acetonitrile was linear, due to bimolecular self-quenching, but curved in toluene as the result of excimer formation. 1H NMR spectra demonstrated a monomer-aggregate equilibrium which resulted in spectral shifts depending on solvent polarity. X-ray crystallography provided structural information concerning the aggregate, which is based on a tetramer consisting of two Δ-fac-Ir(ppy)3-Λ-fac-Ir(ppy)3 pairs. Offset π-π stacking of ppy ligands and electrostatic dipole-dipole interactions between complex molecules play an important role in the formation of these molecular pairs.
UR - http://www.scopus.com/inward/record.url?scp=84882408385&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84882408385&partnerID=8YFLogxK
U2 - 10.1021/jp403974h
DO - 10.1021/jp403974h
M3 - Article
C2 - 23865453
AN - SCOPUS:84882408385
VL - 117
SP - 9449
EP - 9456
JO - Journal of Physical Chemistry B Materials
JF - Journal of Physical Chemistry B Materials
SN - 1520-6106
IS - 32
ER -