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Intermolecular Interactions and Aggregation of fac-tris(2-phenylpyridinato-C2,N)iridium(III) in Nonpolar Solvents

Intermolecular Interactions and Aggregation of fac-tris(2-phenylpyridinato-C2,N)iridium(III) in Nonpolar Solvents

Satoshi Takayasu, Takayoshi Suzuki, Kazuteru Shinozaki

J Phys Chem B. 2013 Aug 15;117(32):9449-56.

PMID: 23865453

Abstract:

The intermolecular interaction and aggregation of the neutral complex fac-tris(2-phenylpyridinato-C(2),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. (1)H 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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP94928866	Tris[2-phenylpyridinato-C2,N]iridium(III)		94928-86-6	Price

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