Hydrogen-Bonding Interactions in a Single-Component Molecular Conductor: a Hydroxyethyl-Substituted Radical Gold Dithiolene Complex
Résumé
The anionic hydroxyethyl-substituted gold dithiolene complex [NEt 4 ][Au(EtOH-thiazdt) 2 ] is synthesized and further oxidized to the neutral radical species [Au(EtOH-thiazdt) 2 ] • through electrocrystallization. Single-crystal X-ray diffraction studies highlight the existence of the two cis and trans isomers for the monoanionic complex, with involvement of the hydroxy group in intermolecular O− H···S hydrogen-bonding interactions. The neutral radical complex, [Au(EtOH-thiazdt) 2 ] • , is isostructural with its known ethyl analogue, namely, [Au(Et-thiazdt) 2 ] • . It exhibits a semiconducting behavior (σ RT = 0.05−0.07 S cm −1) at room temperature and ambient pressure with an activation energy of 0.14 eV. Comparison of the crystal structures and transport and magnetic properties with those of the prototypical [Au(Et-thiazdt) 2 ] • single-component conductor shows that the replacement of ethyl by a slightly bulkier hydroxyethyl substituent affects only weakly the overlap interactions, complemented here by added O−H···S hydrogen-bonding interactions.