Gold(I) Chloride Complexes with 4-Halo-substituted Phenyl Isocyanide Ligands

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Abstract

A series of gold(I) monoisocyanide [AuCl(C6H4–4-X)] (X = Cl (IIa), Br (IIb), I (IIc) and bis-isocyanide [Au(C6H4–4-X)2](PF6) (X = Cl (IIIa), Br (IIIb), I (IIIc) complexes were prepared by the reaction of [AuCl(Tht)] (Tht = tetrahydrothiophene) with the specified isocyanide. The molecular structure of IIa – IIc was established by X-ray diffraction (CCDC no. 2253450 (IIa), 2253447 (IIb), 2253448 (IIc)). The crystals of IIb and IIc are isostructural; they were found to have several types of intermolecular interactions, particularly, C–X⋯Cl – Au halogen bonds, π-hole (CCNR) ⋯ (Au) interactions, and Au⋯Au aurophilic contacts, which form together a two-layer 2D supramolecular polymer. The crystals of IIb, IIc and IIIa, IIIb exhibit phosphorescence at room temperature; compounds IIa and IIIc do not possess luminescent properties; and mechanical grinding of IIa – IIc and IIIa – IIIc powders does not change the photophysical properties.

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About the authors

G. A. Gavrilov

St. Petersburg State University

Email: m.kinzhalov@spbu.ru
Russian Federation, St. Petersburg

K. N. Davletbaeva

St. Petersburg State University

Email: m.kinzhalov@spbu.ru
Russian Federation, St. Petersburg

M. A. Kinzhalov

St. Petersburg State University

Author for correspondence.
Email: m.kinzhalov@spbu.ru
Russian Federation, St. Petersburg

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Supplementary files

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2. Scheme 1.

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3. Fig. 1. Structures of complexes IIa (left), IIb (centre) and IIc (right) according to PCA data with atom numbering scheme.

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4. Fig. 2. Intermolecular interactions in IIa.

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5. Fig. 3. Two-layer 2D supramolecular architecture of IIb resulting from a combination of noncovalent interactions. Crystals IIc have a similar supramolecular structure with similar noncovalent interactions.

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6. Fig. 4. Normalised excitation (dashed line) and luminescence (solid line) spectra for crystalline samples IIb, IIc and IIIa, IIIb at 298 K.

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