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Luminescent Bis‐Cyclometalated Gold(III) Complexes with Alkynyl Ligands of Hexaphenylbenzene and Hexabenzocoronene Derivatives and Their Supramolecular Assembly
Author(s) -
Yim KingChin,
Au Vonika KaMan,
Wong Keith ManChung,
Yam Vivian WingWah
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201606052
Subject(s) - supramolecular chemistry , chemistry , luminescence , photochemistry , polymer chemistry , combinatorial chemistry , materials science , organic chemistry , molecule , optoelectronics
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 3 IL [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 1 H NMR spectroscopy studies.