Hybrid inorganic–organic layered structures of [AuCl4]− and protonated bipyridyl derivatives

Complexes of [AuCl4]− with 4,4′-dipyridylethane, 4,4′-dipyridylethene and 4,4′-bipyridine-N,N′-dioxide have been prepared by a solvent layering method. All three complexes pack in distinct organic and inorganic layers: [H2-dpa][AuCl4]Cl (1) and [H2-dpe][AuCl4]Cl (2) are isostructural and consist of layers of [AuCl4]− anions alternating with hydrogen-bonded dipyridyl⋯Cl⋯dipyridyl layers. In [H-bpdo][AuCl4] (3), the organic layers consist instead of hydrogen-bonded bipyridyldioxide cations. This structure is the first report of a structure containing protonated 4,4′-bipyridine-1,1′-dioxide.

Graphical abstractComplexes of [AuCl4]− with 4,4′-dipyridylethane, 4,4′-dipyridylethene and 4,4′-bipyridine-N,N′-dioxide form hybrid organic–inorganic layered structures. The dipyridyl derivatives are stabilized by N–H⋯Cl and Au⋯Cl interactions. In the complex with and 4,4′-bipyridine-N,N′-dioxide the organic layers consist of hydrogen-bonded bipyridyldioxide cations, with a short O–H⋯O contact.Figure optionsDownload full-size imageDownload as PowerPoint slide