Effects of the frontier orbitals on the electrochemical and electrochemiluminescent properties of the bis-cyclometalated iridium(III) complexes with different ligands

Zhu, Shengnan; Song, Qijun; Zhang, Songlin; Ding, Yuqiang

doi:10.1016/j.molstruc.2012.11.015

Cited by 17 publications

(7 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The close correspondence of the E 1/2 for Ir 3+/4+ for all complexes 1 – 6 (Table ) suggests that the HOMO of the Ir 3+ center is not greatly perturbed by the substitution of the imidazole phenanthroline portion of the complexes. This is consistent with a HOMO that is centered on the metal and the 2-phenylpyridinato ligands . The 3+ and 4+ forms are stable over repeated CV scans.…”

Section: Resultssupporting

confidence: 76%

See 1 more Smart Citation

Cyclometalated Iridium(III) Imidazole Phenanthroline Complexes as Luminescent and Electrochemiluminescent G-Quadruplex DNA Binders

et al. 2015

View full text Add to dashboard Cite

Six cyclometalated iridium(III) phenanthroimidazole complexes with different modifications to the imidazole phenanthroline ligand exhibit enhanced luminescence when bound to guanine (G-) quadruplex DNA sequences. The complexes bind with low micromolar affinity to human telomeric and c-myc sequences in a 1:1 complex:quadruplex stoichiometry. Due to the luminescence enhancement upon binding to G-quadruplex DNA, the complexes can be used as selective quadruplex indicators. In addition, the electrogenerated chemiluminescence of all complexes increases in the presence of specific G-quadruplex sequences, demonstrating potential for the development of an ECL-based G-quadruplex assay.

show abstract

Section: Resultssupporting

confidence: 76%

“…This is consistent with a HOMO that is centered on the metal and the 2-phenylpyridinato ligands. 69 The 3+ and 4+ forms are stable over repeated CV scans. The anodic and cathodic peak currents (i pa and i pc1 , respectively) were proportional to the square root of the scan rate (v 1/2 ) (Supporting Information Figure S11).…”

Section: Inorganic Chemistrymentioning

confidence: 94%

Cyclometalated Iridium(III) Imidazole Phenanthroline Complexes as Luminescent and Electrochemiluminescent G-Quadruplex DNA Binders

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The calculation results indicated that for both the neutral and mono-cationic form, the methyl group could increase the HOMO and LUMO energies of the corresponding complex. According to previous studies, 40,41 the luminophore with the lower LUMO energy level of the monocationic form is usually expected to have a higher ECL intensity. In this work, the LUMO energy levels of both forms follow the same sequence: complex 1 < complex 2 < complex 4 < complex 3.…”

Section: Theoretical Calculationsmentioning

confidence: 93%

Highly efficient electrochemiluminescence from iridium(iii) complexes with 2-phenylquinoline ligand

Zhou

et al. 2015

Dalton Trans.

View full text Add to dashboard Cite

A series of cyclometalated iridium(III) complexes with 2-phenylquinoline ligand (1-4) were designed and synthesized, which were thoroughly investigated by the photophysics, electrochemistry, theoretical calculations and electrochemiluminescence (ECL). By incorporating methyl groups into the 2-phenylquinoline, the corresponding complexes 2 and 3 displayed lower oxidative potential and higher HOMO energy levels. Most importantly, compared with tris(2,2'-bipyridyl)ruthenium(II) ([Ru(bipy)3](2+)), these iridium(III) complexes demonstrated more intense ECL in acetonitrile solutions.

show abstract

“…In the reported ECL experiments, TPrA was used as the co-reactant, with the results indicating a critical role of the ancillary ligands in the design and selection of iridium(III) complexes for any practical ECL applications. ECL efficiencies measured for the iridium(III) chelates investigated by Song et al [ 81 ] were reported to be very small, orders of magnitude smaller than characteristic for Ir(C^N) 2 (pic) or Ir(C^N) 2 (acac) chelates. Another class of the negatively charged N‑heterocyclic carbene C^C ancillary phenyl-substituted imidazolylidene ligands has been investigated by Hogan et al [ 82 ].…”

Section: Ecl Properties Of the Heteroleptic Iridium(iii) Chelatesmentioning

confidence: 96%

“…Noteworthy, the oxidative-reduction process with TPrA lead to much less efficient generation of 3* Ir(tpy) 2 (pic) species because the electron transfer from TPrA • to Ir(tpy) 2 (pic) + is thermodynamically insufficient to populate the excited to 3* Ir(tpy) 2 (pic) state. Song et al have investigated ECL properties of Ir(ppy) 2 (N^O) and Ir(pq) 2 (N^O) complexes with the anionic N^O co-ligands, deprotonated forms of N -phenylmethacrylamide, N -phenylacetamide, N -phenylbenzamide, and N -naphthylbenzamide [ 81 ]. In the reported ECL experiments, TPrA was used as the co-reactant, with the results indicating a critical role of the ancillary ligands in the design and selection of iridium(III) complexes for any practical ECL applications.…”

Section: Ecl Properties Of the Heteroleptic Iridium(iii) Chelatesmentioning

confidence: 99%

Cyclometalated iridium(III) chelates—a new exceptional class of the electrochemiluminescent luminophores

Kapturkiewicz

2016

Anal Bioanal Chem

View full text Add to dashboard Cite

Recent development of the phosphorescent cyclometalated iridium(III) chelates has enabled, due to their advantageous electrochemical and photo-physical properties, important breakthroughs in many photonic applications. This particular class of 5d6 ion complexes has attracted increasing interest because of their potential application in electroluminescence devices with a nearly 100 % internal quantum efficiency for the conversion of electric energy to photons. Similar to electroluminescence, the cyclometalated iridium(III) chelates have been successfully applied in the electricity-to-light conversion by means of the electrochemiluminescence (ECL) processes. The already reported ECL systems utilizing the title compounds exhibit extremely large ECL efficiencies that allow one to envisage many potential application for them, especially in further development of ECL-based analytical techniques. This review, based on recently published papers, focuses on the ECL properties of this very exciting class of organometallic luminophores. The reported work, describing results from fundamental as well as application-oriented investigations, will be surveyed and briefly discussed.Graphical abstractDepending on the chemical nature of the cyclometalated irdium(III) chelate different colours of the emitted light can be produced during electrochemical excitation.

show abstract

Effects of the frontier orbitals on the electrochemical and electrochemiluminescent properties of the bis-cyclometalated iridium(III) complexes with different ligands

Cited by 17 publications

References 48 publications

Cyclometalated Iridium(III) Imidazole Phenanthroline Complexes as Luminescent and Electrochemiluminescent G-Quadruplex DNA Binders

Cyclometalated Iridium(III) Imidazole Phenanthroline Complexes as Luminescent and Electrochemiluminescent G-Quadruplex DNA Binders

Highly efficient electrochemiluminescence from iridium(iii) complexes with 2-phenylquinoline ligand

Cyclometalated iridium(III) chelates—a new exceptional class of the electrochemiluminescent luminophores

Contact Info

Product

Resources

About