Issue 14, 2022

Systematic investigation of the influence of electronic substituents on dinuclear gold(i) amidinates: synthesis, characterisation and photoluminescence studies

Abstract

Dinuclear gold(I) compounds are of great interest due to their aurophilic interactions that influence their photophysical properties. Herein, we showcase that gold–gold interactions can be influenced by tuning the electronic properties of the ligands. Therefore, various para substituted (R) N,N′-bis(2,6-dimethylphenyl)formamidinate ligands (pRXylForm; Xyl = 2,6-dimethylphenyl and Form = formamidinate) were treated with Au(tht)Cl (tht = tetrahydrothiophene) to give via salt metathesis the corresponding gold(I) compounds [pRXylForm2Au2] (R = –OMe, –Me, –Ph, –H, –SMe, and –CO2Me). All complexes showed intense luminescence properties at low temperatures. Alignment with the Hammett parameter σp revealed the trends in the 1H and 13C NMR spectra. These results showed the influence of the donor–acceptor abilities of different substituents on the ligand system which were confirmed with calculated orbital energies. Photophysical investigations showed their lifetimes in the millisecond range indicating phosphorescence processes and revealed a redshift with the decreasing donor ability of the substituents in the solid state.

Graphical abstract: Systematic investigation of the influence of electronic substituents on dinuclear gold(i) amidinates: synthesis, characterisation and photoluminescence studies

Supplementary files

Article information

Article type
Paper
Submitted
09 Nov 2021
Accepted
24 Feb 2022
First published
10 Mar 2022
This article is Open Access
Creative Commons BY license

Dalton Trans., 2022,51, 5471-5479

Systematic investigation of the influence of electronic substituents on dinuclear gold(I) amidinates: synthesis, characterisation and photoluminescence studies

F. Krätschmer, X. Gui, M. T. Gamer, W. Klopper and P. W. Roesky, Dalton Trans., 2022, 51, 5471 DOI: 10.1039/D1DT03795A

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