A new, aurophilically-bonded tris[μ2-(1-Ethylimidazolato-N3, C2)gold(I)] complex, [Au(EtIm)3] = 1, has been synthesized and characterized spectroscopically. The single-crystal X-ray diffraction showed that the complex crystalizes in the P21/c space group with two molecules in the unit cell. The packing of 1 molecules entails two distinct pairs of dimer-of-trimer units with 3.066 Å and 3.141Å intertrimer separations, which comprise the shortest ever pairwise intermolecular Au---Au interaction of cyclic trinuclear azolate complexes. Upon cooling from 298 to 4K, crystals of 1 exhibit luminescence thermochromism of 9017 cm-1, spanning the entire visible region – from violet to red! This presentation will illustrate all aspects of novelty of 1 vs its known congeners, including solid-state intermolecular aurophilic interactions, luminescence thermochromism, redox properties, π acid-base chemistry, etc.

Violet-to-red luminescence thermochromism in gold (I) cyclic trinuclear complexes

252nd National Meeting (2016)

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