Issue 10, 2018

Aurophilicity vs. thiophilicity: directing the crystalline supramolecular arrangement in luminescent gold compounds

Abstract

Herein, we study the influence of the fluorination of thiolate ligand backbones over the solid state crystalline supramolecular arrangement in a series of seven new dinuclear fluorophenylthiolate gold(I) coordination compounds. These compounds include the bridge ligand 1,2-bis(diphenylphosphine)ethane (dppe) and have the general formula [Au2(SRF)2(μ-dppe)] with SRF = SC6F5 (1); SC6HF4-4 (2); SC6H3F2-3,5 (3); SC6H3F2-2,4 (4); SC6H4(CF3)-2 (5); SC6H4F-3 (6) and SC6H4(CF3)-4 (7). By the analysis of X-ray crystalline structures, we found that the increase in the fluorination degree of the ligands reduces the incidence of aurophilic interactions and collaterally favours the formation of a secondary Au⋯S (thiophilic) interaction resulting in a rhomboidal planar (AuS)2 unit. This latter synthon recurrently competes with the expected Au–Au contacts. All the analysed compounds show visible photoluminescence in the solid state, indicating an aggregation-induced emissive behaviour, i.e. both the aurophilic and thiophilic interactions promote the emission of light by this family of gold complexes.

Graphical abstract: Aurophilicity vs. thiophilicity: directing the crystalline supramolecular arrangement in luminescent gold compounds

Supplementary files

Article information

Article type
Paper
Submitted
15 stu 2017
Accepted
12 vlj 2018
First published
12 vlj 2018

New J. Chem., 2018,42, 7845-7852

Aurophilicity vs. thiophilicity: directing the crystalline supramolecular arrangement in luminescent gold compounds

G. Moreno-Alcántar, G. Romo-Islas, M. Flores-Álamo and H. Torrens, New J. Chem., 2018, 42, 7845 DOI: 10.1039/C7NJ04354F

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