Preparation and identification of iridium bipyridine and phenanthroline complexes

Kahl, J. L.; Hanck, Kenneth W.; DeArmond, Keith

doi:10.1016/0022-1902(79)80433-9

Cited by 31 publications

(8 citation statements)

References 32 publications

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“…tiplicities along a period33 as well as variations in the participation31 from the ( + l)s orbital in the M-R bond down a triad. 31 Our calculated bond strengths are in fair agreement with the few available experimental data on D(M-R) bond energies in RML" complexes. Connor41 et al found for RMn(CO)5 that D(Mn-H) = 213 kJ mol"1 2and D(Mn-CH3) = 153 kJ mol"1, respectively.…”

supporting

confidence: 85%

Synthesis, structure, electrochemistry, and photophysics of methyl-substituted phenylpyridine ortho-metalated iridium(III) complexes

Garces¹,

King²,

Watts³

1988

Inorg. Chem.

300

219

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supporting

confidence: 85%

Synthesis, structure, electrochemistry, and photophysics of methyl-substituted phenylpyridine ortho-metalated iridium(III) complexes

Garces¹,

King²,

Watts³

1988

Inorg. Chem.

300

219

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“…All proton peaks for the TM complex shifted upfield, consistent with cavity association (Table and Table S1). Peaks for the free Ru(II) complexes were assigned according to the literature for [M(PP) 3 ] 2+ complexes in water (M = Fe, Ru, or Os), and those for the Ir(III) complexes were assigned similarly, as the spectra were very similar to those of Ru(II) analogues; the order of peaks also agrees with that previously assigned in DMSO- d 6 . For all guests, protons on the “farther” edge of the polypyridyl ligands (H3,3′ and H4,4′ for bpy and H4,7 and H5,6 for phen) exhibited large shifts in the presence of Q[10], while those in the position meta to the coordinating N atom (H5,5′ for bpy and H3,8 for phen) were least affected.…”

Section: Resultssupporting

confidence: 59%

“…Peaks for the free Ru(II) complexes were assigned according to the literature for [M(PP) 3 ] 2+ complexes in water (M = Fe, Ru, or Os), 47 and those for the Ir(III) complexes were assigned similarly, as the spectra were very similar to those of Ru(II) analogues; the order of peaks also agrees with that previously assigned in DMSO-d 6 . 48 For all guests, protons on the "farther" edge of the polypyridyl ligands (H3,3′ and H4,4′ for bpy and H4,7 and H5,6 for phen) exhibited large shifts in the presence of Q [10], while those in the position meta to the coordinating N atom (H5,5′ for bpy and H3,8 for phen) were least affected. At all stages, only one set of peaks was observed for the guest; sharp peaks indicated fast exchange for Ru-1 with Q [10], and broader peaks indicated intermediate exchange for the larger Ru-2 with Q [10], on the NMR time scale.…”

Section: ■ Experimental Sectionmentioning

confidence: 95%

Interaction of the Large Host Q[10] with Metal Polypyridyl Complexes: Binding Modes and Effects on Luminescence

et al. 2020

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Aqueous solution state host−guest systems have been studied, comprising the large host cucurbit[10]uril with luminescent cationic tris(polypyridyl) (PP) metal complexes [Ru(PP) 3 ] 2+ and [Ir(PP) 3 ] 3+ . All complexes bind strongly with the host, with the overall complex charge and size having a minor effect on affinity but influencing the association dynamics and contribution from higher-order (1:2) host−guest species. The 1:2 species contributes more significantly to the binding equilibrium in the case of [Ru(phen) 3 ] 2+ . The effect of the host upon emission is highly variable and depends on the electronic structure of the guest. The metal-to-ligand charge transfer (MLCT) emission of [Ru(PP) 3 ] 2+ is strongly quenched, in contrast to the large enhancements seen previously for MLCT emission of iridium cyclometalated complexes, while the ligand-centered emission of [Ir(PP) 3 ] 3+ is little affected. The mechanisms of quenching and enhancement are discussed, together with the implications for the design of larger supramolecular assemblies based on these archetypal emitters.

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“…Cyclic voltammograms of the first three reduction peaks are shown in Figure 3. A stepwise CPC experiment done first at -0.98 V ( = 1.06), then at -1.10 1.0 V/s, (c) 5.0 V/s, (d) 10 V/s, (e) 20 V/s, (f) 100 V/s. 20 V/s, (c) 100 V/s.…”

Section: Resultsmentioning

confidence: 99%

Electrochemistry of iridium tris- and bisesquis(phenanthroline) complexes

Kahl¹,

Hanck²,

DeArmond³

1979

J. Phys. Chem.

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Publication costs assisted by North Carolina State University Cyclic voltammetry data have been obtained for the trisand bisesquis(l,10-phenanthroline) (phen) complexes of iridium(III) in acetonitrile. A reaction mechanism is proposed on the basis of the analysis of electrochemical and luminescence data. For the bisesqui-and tris(phen) complexes the mechanisms are similar to the corresponding 2,2'-bipyridine (bpy) Ir(III) complexes except that an insoluble deposit forms after three electrons have been transferred. Similar behavior has been observed for the reduction of [Ru(bpy)3]2+, however, comparison of the reverse (oxidation) scan for the first reduction wave of the tris Ir(III) and Ru(II) complexes indicates distinctly different behavior. These data are interpreted as resulting from the multiring delocalized redox orbital of the Ru(II) complex and the single ring delocalized redox orbital of the Ir(III) complex.

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Preparation and identification of iridium bipyridine and phenanthroline complexes

Cited by 31 publications

References 32 publications

Synthesis, structure, electrochemistry, and photophysics of methyl-substituted phenylpyridine ortho-metalated iridium(III) complexes

Synthesis, structure, electrochemistry, and photophysics of methyl-substituted phenylpyridine ortho-metalated iridium(III) complexes

Interaction of the Large Host Q[10] with Metal Polypyridyl Complexes: Binding Modes and Effects on Luminescence

Electrochemistry of iridium tris- and bisesquis(phenanthroline) complexes

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