Crystal engineering of aurophilic supramolecular architectures and coordination polymers based on butterfly-like copper–dicyanoaurate complexes: vapochromism, P–T behaviour and multi-metallic cocrystal formation

Emanuele Priola; Nadia Curetti; Domenica Marabello; Jacopo Andreo; Alessia Giordana; Luca Andreo; Piera Benna; Paulo Tarso Cavalcante Freire; Paola Benzi; Lorenza Operti; Eliano Diana

doi:10.1039/D1CE00964H

Crystal engineering of aurophilic supramolecular architectures and coordination polymers based on butterfly-like copper–dicyanoaurate complexes: vapochromism, P–T behaviour and multi-metallic cocrystal formation†

Emanuele Priola,

‡*^a Nadia Curetti,‡^b Domenica Marabello,‡^a Jacopo Andreo,

^c Alessia Giordana,

^a Luca Andreo,

^a Piera Benna,

‡^b Paulo Tarso Cavalcante Freire,

^d Paola Benzi,‡^a Lorenza Operti ‡^a and Eliano Diana

‡*^a

Author affiliations

* Corresponding authors

^a Department of Chemistry, Università di Torino, Via Pietro Giuria 7, 10125 Torino, Italy
E-mail: emanuele.priola@unito.it, eliano.diana@unito.it

^b Department of Earth Sciences, Università di Torino, Via Valperga Caluso 35, 10125 Torino, Italy

^c BCMaterials, Basque Center for Materials, UPV/EHU Science Park, 48940 Leioa, Spain

^d Departamento de Física, Universidade Federal do Ceará, C.P. 6030, Campus do Pici, Fortaleza, CE, Brazil

Abstract

Using the equilibrium properties of the Cu(II) cation in the presence of chelating ligands and the characteristics of the dicyanoaurate anion, we were able to obtain a family of 5 bimetallic Cu–Au compounds with supramolecular architectures based on aurophilic interactions. These compounds have been tested for vapochromism at different temperatures and pressures. One of the obtained products shows reversible vapochromism in the presence of ammonia and the process has been studied using IR and UV-vis absorption spectroscopy. The behaviour at variable temperatures and pressures of these crystalline materials has been investigated, showing the effect of these two variables. Moreover, an isosymmetric phase transition at 1.2 GPa has been detected and studied with Raman and SC-XRD. Finally, Cu–Au molecular building blocks have been used to construct cocrystals, opening the way for the crystal engineering of new multimetallic compounds based on aurophilic interactions.

CrystEngComm

Crystal engineering of aurophilic supramolecular architectures and coordination polymers based on butterfly-like copper–dicyanoaurate complexes: vapochromism, P–T behaviour and multi-metallic cocrystal formation†

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Crystal engineering of aurophilic supramolecular architectures and coordination polymers based on butterfly-like copper–dicyanoaurate complexes: vapochromism, P–T behaviour and multi-metallic cocrystal formation

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