Luminescent bis-cyclometalated gold(III) complexes with alkynyl ligands of hexaphenylbenzene and hexabenzocoronene derivatives and their supramolecular assembly

King-Chin YIM, Ka Man Vonika AU, Keith Man-Chung WONG, Vivian Wing-Wah YAM

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A series of luminescent bis-cyclometalated gold(III) complexes with different nuclearities and various alkynyl ligands derived from hexaphenylbenzene (HPB) and hexabenzocoronene (HBC) have been synthesized. The energies of the low-energy metal-perturbed intraligand (IL) π–π*(R−C^N^C) absorptions of the HPB–alkynyl gold(III) complexes have been fine-tuned by attaching various substituent groups to the bis-cyclometalating ligands. Similarly, the metal-perturbed 3IL [π→π*(R−C^N^C)] emissions of the complexes show energy shifts according to the electronic nature of the bis-cyclometalating ligands. On the contrary, the absorption and emission spectra of the HBC–alkynyl gold(III) complex have been assigned as dominated by the IL transitions of the HBC–alkynyl unit, as supported by transient absorption studies. The supramolecular assembly morphologies of the gold(III) complexes have been studied by TEM and SEM, along with comparisons across different complexes based on the molecular structures, and their assembly processes monitored by concentration-dependent and variable-temperature 1H NMR spectroscopy studies. Copyright © 2017 Wiley-VCH Verlag GmbH &Co. KGaA, Weinheim.

Original languageEnglish
Pages (from-to)5772-5786
JournalChemistry - A European Journal
Volume23
Issue number24
Early online date20 Feb 2017
DOIs
Publication statusPublished - 27 Apr 2017

Fingerprint

Gold
Ligands
Derivatives
Metals
Molecular structure
Nuclear magnetic resonance spectroscopy
Transmission electron microscopy
Scanning electron microscopy
Temperature

Citation

Yim, K.‐C., Au, V. K.‐M., Wong, K. M.‐C., & Yam, V. W.‐W. (2017). Luminescent bis-cyclometalated gold(III) complexes with alkynyl ligands of hexaphenylbenzene and hexabenzocoronene derivatives and their supramolecular assembly. Chemistry - A European Journal, 23(24), 5772-5786. doi: 10.1002/chem.201606052

Keywords

  • Gold
  • Luminescence
  • Pi interactions
  • Polycycles
  • Self-assembly