Synthesis, luminescence, and excited-state complexes of the tris(1,10-phenanthroline)- and bis(terpyridine)iridium(III) cations

Journal Article · Wed May 09 04:00:00 EDT 1990 · Journal of the American Chemical Society; (USA)

DOI:https://doi.org/10.1021/ja00166a018· OSTI ID:6807068

Ayala, N P; Flynn, Jr, C M; Sacksteder, L; Demas, J N ^[1]; DeGraff, B A ^[2]

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1. Univ. of Virginia, Charlottesville (USA)
2. James Madison Univ., Harrisonburg, VA (USA)

The authors report the synthesis and luminescence properties of Ir(phen){sub 3}{sup 3+} and Ir(terp){sub 2}{sup 3+} (phen = 1,10-phenanthroline and terp = 2,6-bis(2-pyridyl)pyridine). Their emissions are assigned to predominantly {pi}-{pi}* phosphorescences. A novel excited-state complex is proposed to form between Ir(phen){sub 3}{sup 3+} and Ir(terp){sub 2}{sup 3+} and HgCl{sub 2}. Although HgCl{sub 2} is normally a quencher, it can greatly enhance the lifetimes and luminescence efficiencies of the Ir(phen){sub 3}{sup 3+} and Ir(terp){sub 2}{sup 3+} - up to an order of magnitude. The changes arise from alteration of the radiative and nonradiative rate constants in the excited-state complex. The effect of temperature, solvent, oxygen, and inert ions on the interactions of HgCl{sub 2} with the excited complexes is explored. A simple associative model accurately reproduces all lifetime and intensity changes. A rationale based on the well-known affinity of HgCl{sub 2} for aromatic molecules is proposed.

• OSTI ID: 6807068
• Journal Information: Journal of the American Chemical Society; (USA), Journal Name: Journal of the American Chemical Society; (USA) Vol. 112:10; ISSN 0002-7863; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
AZINES
CHEMISTRY
COMPLEXES
DATA
DATA ANALYSIS
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
IRIDIUM COMPLEXES
LUMINESCENCE
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMISTRY
PYRIDINES
SYNTHESIS
TRANSITION ELEMENT COMPLEXES