Skip to content

Research at St Andrews

Synthesis, characterization and optoelectronic properties of iridium complexes bearing nonconjugated six-membered chelating ligands

Research output: Contribution to journalArticlepeer-review

Author(s)

Claus Hierlinger, Amlan K. Pal, Filippo Stella, Tomas Lebl, David B. Cordes, Alexandra M. Z. Slawin, Denis Jacquemin, Véronique Guerchais, Eli Zysman-Colman

School/Research organisations

Abstract

We report the synthesis, characterization and the optoelectronic properties of a series of four new luminescent iridium(III) complexes 1-4, of the form [Ir(C^N)2(N^N)]PF6 [where C^N is the nonconjugated benzylpyridinato (bnpy) and N^N is a neutral diimine ancillary ligand] with the goal of investigating the impact of the methylene spacer between the coordination moieties of the C^N ligand on the optoelectronic properties of the complexes. The crystal structures of 1-3 illustrate two possible orientations of the methylene unit of the bnpy ligand. The formation of these two separate conformers is a result of the conformational flexibility of the bnpy ligand. In complexes 3 and 4, mixtures of the two conformers were observed by 1H-NMR spectroscopy in CDCl3 at room temperature, whereas only a single conformer is detected for 1 and 2. Detailed DFT calculations corroborate ROESY experiments, accounting for the presence and relative populations of the two conformers. The optoelectronic properties of all four complexes, rationalized by the theoretical study, demonstrate that the interruption of conjugation in the C^N ligands results in a reduced electrochemical gap but similar triplet state energies and lower photoluminescence quantum yields compared to the reference complexes R1-R4. Depending on the nature of the N^N ligand, we observe (1) marked variations of the ratio of the conformers at ambient temperature and (2) phosphorescence ranging from yellow to red.
Close

Details

Original languageEnglish
Pages (from-to)2023-2034
JournalInorganic Chemistry
Volume57
Issue number4
Early online date30 Jan 2018
DOIs
Publication statusPublished - 19 Feb 2018

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Conjugated, rigidified bibenzimidazole ancillary ligands for enhanced photoluminescence quantum yields of orange/red-emitting iridium(III) complexes

    Henwood, A. F., Antón-García, D., Morin, M., Rota Martir, D., Cordes, D. B., Casey, C., Slawin, A. M. Z., Lebl, T., Buehl, M. & Zysman-Colman, E., 14 Jul 2019, In: Dalton Transactions. 48, 26

    Research output: Contribution to journalArticlepeer-review

  2. Thermally activated delayed fluorescence emitters with intramolecular proton transfer for high luminance solution-processed organic light-emitting diodes

    Gupta, A., Li, W., Ruseckas, A., Lian, C., Carpenter-Warren, C. L., Cordes, D. B., Slawin, A. M. Z., Jacquemin, D., Samuel, I. D. W. & Zysman-Colman, E., 30 Mar 2021, In: ACS Applied Materials & Interfaces. Articles ASAP

    Research output: Contribution to journalArticlepeer-review

  3. Investigation of intramolecular through-space charge-transfer states in donor-acceptor charge-transfer systems

    Kumar, S., Franca, L. G., Stavrou, K., Crovini, E., Cordes, D. B., Slawin, A. M. Z., Monkman, A. P. & Zysman-Colman, E., 15 Mar 2021, In: Journal of Physical Chemistry Letters. 12, p. 2820-2830 11 p.

    Research output: Contribution to journalArticlepeer-review

  4. Fast delayed emission in new pyridazine-based compounds

    Krotkus, S., Matulaitis, T., Diesing, S., Copley, G. J., Archer, E., Keum, C., Cordes, D. B., Slawin, A. M. Z., Gather, M. C., Zysman-Colman, E. & Samuel, I. D. W., 7 Jan 2021, In: Frontiers in Chemistry. 8, 572862.

    Research output: Contribution to journalArticlepeer-review

Related by journal

  1. Simultaneous presence of open metal sites and amine groups on a 3D Dy(III)-metal–organic framework catalyst for mild and solvent-free conversion of CO2 to cyclic carbonates

    Abazari, R., Sanati, S., Morsali, A., Kirillov, A. M., Slawin, A. M. Z. & Carpenter-Warren, C. L., 15 Jan 2021, In: Inorganic Chemistry. Articles ASAP

    Research output: Contribution to journalArticlepeer-review

  2. Ab initio molecular dynamics investigation of beryllium complexes

    Raymond, O., Buehl, M., Lane, J., Henderson, W., Brothers, P. & Plieger, P., 4 Feb 2020, In: Inorganic Chemistry. Articles ASAP

    Research output: Contribution to journalArticlepeer-review

  3. Application of NMR crystallography to highly disordered templated materials: extensive local structural disorder in the gallophosphate GaPO-34A

    Ashbrook, S. E., Dawson, D. M., Gan, Z., Hooper, J. E., Hung, I., Macfarlane, L. E., McKay, D., McLeod, L. K. & Walton, R. I., 4 Aug 2020, In: Inorganic Chemistry. Article ASAP

    Research output: Contribution to journalArticlepeer-review

  4. Diradical character of neutral heteroleptic bis(1,2-dithiolene) metal complexes: case study of [Pd(Me2timdt)(mnt)] (Me2timdt = 1,3-dimethyl-2,4,5-trithioxoimidazolidine; mnt2– = 1,2-dicyano-1,2-ethylenedithiolate)

    Aragoni, M. C., Caltagirone, C., Lippolis, V., Podda, E., Slawin, A. M. Z., Woollins, J. D., Pintus, A. & Arca, M., 13 Nov 2020, In: Inorganic Chemistry. Articles ASAP

    Research output: Contribution to journalArticlepeer-review

  5. Luminescent dinuclear copper(I) complexes bearing an imidazolylpyrimidine bridging ligand

    Li, C., Li, W., Henwood, A. F., Hall, D., Cordes, D. B., Slawin, A. M. Z., Lemaur, V., Olivier, Y., Samuel, I. D. W. & Zysman-Colman, E., 1 Sep 2020, In: Inorganic Chemistry. Article ASAP

    Research output: Contribution to journalArticlepeer-review

ID: 252129230

Top