Intermolecular interactions and aggregation of fac -Tris(2- phenylpyridinato- C 2, N)iridium(III) in nonpolar solvents

Satoshi Takayasu; Takayoshi Suzuki; Kazuteru Shinozaki

doi:10.1021/jp403974h

Intermolecular interactions and aggregation of fac -Tris(2- phenylpyridinato- C ², N)iridium(III) in nonpolar solvents

Satoshi Takayasu, Takayoshi Suzuki, Kazuteru Shinozaki

Research output: Contribution to journal › Article › peer-review

40 Citations (Scopus)

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	https://doi.org/10.1021/jp403974h
Publication status	Published - Aug 15 2013

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1021/jp403974h

Cite this

@article{b8310356eaff4cc4a2cc8f0c986ac9fe,

title = "Intermolecular interactions and aggregation of fac -Tris(2- phenylpyridinato- C 2, N)iridium(III) in nonpolar solvents",

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.",

author = "Satoshi Takayasu and Takayoshi Suzuki and Kazuteru Shinozaki",

year = "2013",

month = aug,

day = "15",

doi = "10.1021/jp403974h",

language = "English",

volume = "117",

pages = "9449--9456",

journal = "Journal of Physical Chemistry B",

issn = "1520-6106",

number = "32",

}

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

JF - Journal of Physical Chemistry B

SN - 1520-6106

IS - 32

ER -

Intermolecular interactions and aggregation of fac -Tris(2- phenylpyridinato- C ², N)iridium(III) in nonpolar solvents

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this