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Assembly and dichroism of a four-component halogen-bonded metal–organic cocrystal salt solvate involving dicyanoaurate(I) acceptors

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Abstract

We describe the use of dicyanoaurate ions as linear ditopic metal–organic acceptors for the halogen bond-driven assembly of a dichroic metal–organic cocrystal based on azobenzene chromophores. Structural analysis by single crystal X-ray diffraction revealed that the material is a four-component solid, consisting of anticipated anionic metal–organic halogen-bonded chains based on dicyanoaurate ions, as well as complex potassium-based cations and discrete molecules of the crown ether 15-crown-5. Importantly, the structural analysis revealed the parallel alignment of the halogen-bonded chains required for dichroic behaviour, confirming that crystal engineering principles developed for the design of halogen-bonded dichroic organic cocrystals are also applicable to metal-based structures. In the broader context of crystal engineering, the structure of the herein reported dichroic material is additionally interesting as the presence of an ion pair, a neutral azobenzene and a molecule of a room-temperature liquid make it an example of a solid that simultaneously conforms to definitions of a salt, a cocrystal, and a solvate.

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Publication details

The article was received on 22 Mar 2017, accepted on 04 May 2017 and first published on 04 May 2017


Article type: Paper
DOI: 10.1039/C7FD00114B
Citation: Faraday Discuss., 2017, Advance Article
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    Assembly and dichroism of a four-component halogen-bonded metal–organic cocrystal salt solvate involving dicyanoaurate(I) acceptors

    J. Christopherson, K. P. Potts, O. S. Bushuyev, F. Topić, I. Huskić, K. Rissanen, C. J. Barrett and T. Friščić, Faraday Discuss., 2017, Advance Article , DOI: 10.1039/C7FD00114B

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