Luminescent dinuclear bis-cyclometalated gold(III) alkynyls and their solvent-dependent morphologies through supramolecular self-assembly

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

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13 Citations (Scopus)

Abstract

A series of luminescent bis-cyclometalated gold(III) complexes containing bridging alkynyl ligands of different natures has been synthesised and characterised. The photophysical properties of the complexes have been investigated through electronic absorption spectroscopy and emission studies. The vibronic emission bands are found to originate from the triplet intraligand (IL) π–π* excited states of the bis-cyclometalating ligands with some mixing of ³IL π–π* character of the alkynyl ligands. The electrochemical study of a nonsymmetric dinuclear complex shows two successive reduction processes originating from the reductions of the two different cyclometalating ligands. The complexes are found to undergo supramolecular self-assembly processes driven by π–π stacking and hydrophobic/hydrophilic interactions to give honeycomb nanostructures, as revealed from the SEM images. Solvent-dependent morphological transformations have also been observed, which have been studied by SEM and ¹H NMR spectroscopy. Copyright © 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Original languageEnglish
Pages (from-to)16258-16270
JournalChemistry - A European Journal
Volume22
Issue number45
Early online date28 Sep 2016
DOIs
Publication statusPublished - 02 Nov 2016

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Gold
Self assembly
Ligands
Scanning electron microscopy
Absorption spectroscopy
Excited states
Nuclear magnetic resonance spectroscopy
Nanostructures

Citation

Yim, K.‐C., Au, V. K.‐M., Hung, L.‐L., Wong, K. M.‐C., & Yam, V. W.‐W. (2016). Luminescent dinuclear bis-cyclometalated gold(III) alkynyls and their solvent-dependent morphologies through supramolecular self-assembly. Chemistry - A European Journal, 22(45), 16258-16270. doi: 10.1002/chem.201603186

Keywords

  • Alkyne ligands
  • Bridging ligands
  • Gold
  • Self-assembly
  • Tridentate ligands