Synthesis and high-resolution optical of Bis(2-(2-thienyl)pyridinato-C, N')(2, 2'-bipyridine)iridium(III)

Journal Article · Wed Jul 07 00:00:00 EDT 1993 · Inorganic Chemistry; (United States)

DOI:https://doi.org/10.1021/ic00066a019· OSTI ID:5847796

Colombo, M G; Guedel, H U ^[1]

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1. Universitaet Bern (Switzerland)

The synthesis and high-resolution absorption and luminescence spectra at cryogenic temperatures of [Ir(thpy)[sub 2]bpy][sup +](thpyH = 2-(2-thienyl)pyridine, bpy = 2, 2'-bipyridine) are reported. In the crystalline host lattices [Rh(ppy)[sub 2]bpy]-PF[sub 6] and [Ir(ppy)[sub 2]bpy]PF[sub 6](ppyH = 2-phenylpyridine) the lowest excited states around 18,900 cm[sup [minus]1] correspond to spin-forbidden [sup 3][pi]-[pi]* transitions on the thpy[minus], whereas the next higher excited state is assigned to an Ir [yields] bpy charge-transfer transition at 21,700 cm[sup [minus]1]. This metal to ligand charge-transfer ([sup 3]MLCT) state is found to be strongly dependent on the surroundings. In liquid environments it can shift below the [sup 3][pi]-[pi]* state, which remains at about the same energy. Evidence for a mixing of charge-transfer character into the [sup 3][pi]-[pi]* excited states is provided by the measured oscillator strengths, the luminescence lifetimes, the vibronic structure, and by a comparison with the properties of analogous cyclometalated Rh[sup 3+] complexes.

• OSTI ID: 5847796
• Journal Information: Inorganic Chemistry; (United States), Journal Name: Inorganic Chemistry; (United States) Vol. 32:14; ISSN 0020-1669; ISSN INOCAJ
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
AZINES
BIPYRIDINES
CHEMICAL PREPARATION
COMPLEXES
ELECTRONIC STRUCTURE
ENERGY LEVELS
EXCITED STATES
HETEROCYCLIC COMPOUNDS
IRIDIUM COMPLEXES
LIFETIME
LUMINESCENCE
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OSCILLATOR STRENGTHS
PYRIDINES
RESONANCE
SPECTROSCOPY
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
VIBRATIONAL STATES