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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 dismisses 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 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 aurophilic or thiophilic interactions promote the emission of light by this family of gold complexes.

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Publication details

The article was received on 15 Nov 2017, accepted on 12 Feb 2018 and first published on 12 Feb 2018


Article type: Paper
DOI: 10.1039/C7NJ04354F
Citation: New J. Chem., 2018, Accepted Manuscript
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    Aurophilicity vs thiophilicity: directing the crystalline supramolecular arrangement in luminescent gold compounds

    L. G. Moreno-Alcántar, G. Romo-Islas, M. Flores-Alamo and H. Torrens, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ04354F

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