Synthesis, characterization, self-assembly, gelation, morphology and computational studies of alkynylgold(III) complexes of 2,6-bis(benzimidazol-2'- yl)pyridine derivatives

King-Chin YIM, Elizabeth Suk-Hang LAM, Keith Man-Chung WONG, Ka Man Vonika AU, Chi-Chiu KO, Wai Han LAM, Vivian Wing-Wah YAM

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Abstract

A novel class of alkynylgold(III) complexes of the dianionic ligands derived from 2,6-bis(benzimidazol-2'-yl)pyridine (H2bzimpy) derivatives has been synthesized and characterized. The structure of one of the complexes has also been determined by X-ray crystallography. Electronic absorption studies showed low-energy absorption bands at 378-466 nm, which are tentatively assigned as metal-perturbed π-π* intraligand transitions of the bzimpy2- ligands. A computational study has been performed to provide further insights into the nature of the electronic transitions for this class of complexes. One of the complexes has been found to show gelation properties, driven by π-π and hydrophobic-hydrophobic interactions. This complex exhibited concentration- and temperature-dependent 1H NMR spectra. The morphology of the gel has been characterized by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Copyright © 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Original languageEnglish
Pages (from-to)9930-9939
JournalChemistry - A European Journal
Volume20
Issue number32
Early online date15 Jul 2014
DOIs
Publication statusPublished - 04 Aug 2014

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Citation

Yim, K.‐C., Lam, E. S.‐H., Wong, K. M.‐C., Au, V. K.‐M., Ko, C.‐C., Lam, W. H., & Yam, V. W.‐W. (2014). Synthesis, characterization, self-assembly, gelation, morphology and computational studies of alkynylgold(III) complexes of 2,6-bis(benzimidazol-2'- yl)pyridine derivatives. Chemistry - A European Journal, 20(32), 9930-9939. doi: 10.1002/chem.201402876

Keywords

  • Alkynyl ligands
  • Gels
  • Gold
  • Self-assembly
  • Tridentate ligands