Preparation and structure of NHC Hg(ii) and Ag(i) macrometallocycles?

CrystEngComm Pub Date: 2015-11-06 DOI: 10.1039/C5CE01352F

Abstract

A series of functionalized bis-azolium salts, 1,8-bis[2′-(N-R-azoliumyl)ethoxy]-9,10-anthraquinone hexafluorophosphate L1H2·(PF6)2–L4H2·(PF6)2 (R = Et, CH2Ph and CH2Py, azoliumyl = benzimidazoliumyl or imidazoliumyl), as well as their seven N-heterocyclic carbene mercury(II) and silver(I) complexes [(L2HgBr)2](HgBr4) (1), [L2Hg(HgI4)]2 (2), [L1Hg(HgI4)] (3), [L4Hg(HgI4)] (4), [L1Ag](PF6) (5), [L3Ag](PF6) (6) and [L4Ag](PF6) (7) have been prepared and characterized. In complexes 1 or 2, two 16-membered macrometallocycles are connected together via two bridging halide ions (two bridging bromide ions for 1, and two bridging iodide ions for 2). In complexes 3–7, each molecule contains one 16-membered macrometallocycle formed by one biscarbene ligand (L1 for 3 and 5, L3 for 6, L4 for 4 and 7) and one metal ion (Hg(II) for 3 and 4, Ag(I) for 5–7). In the crystal packings of 1–7, 2D supramolecular layers and 3D supramolecular architectures are formed via intermolecular weak interactions (such as the hydrogen bonds, π–π interactions and C–H?π contacts). In addition, the fluorescence emission spectra of the complexes and bis-azolium salts were described. The cyclic voltammetry study for silver(I) complexes 5–7 was conducted.

Graphical abstract: Preparation and structure of NHC Hg(ii) and Ag(i) macrometallocycles
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