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Two bis-imidazolium salts 1,8-bis[2’-( N -R-imidazoliumyl)acetylamino]naphthalene chloride (L 1 H 4 ·Cl 2 : R = Et; L 2 H 4 ·Cl 2 : R =  n Bu), as well as their four NHC metal complexes [L 1 H 2 Ag]Cl (1), [L 1 Ni] (2), [L 2 Ni] (3) and [L 1 H 2 Hg(HgCl 4 )] (4) have been synthesized. In each of the cationic moieties of complexes 1 or 4, there is a groove-like 14-membered macrometallocycle, and each macrometallocycle is consisted of one biscarbene ligand L 1 H 2  and one metal ion (silver(I) ion for 1 and mercury(II) ion for 4). Three 6-membered cycles are contained in each molecule of complexes 2 or 3. Additionally, the selective recognition of macrometallocycle 1 for Cu 2+  was studied with the methods of fluorescence and ultraviolet spectroscopy,  1 H NMR titrations, MS and IR spectra. The experimental results display macrometallocycle 1 can discriminate Cu 2+  from other cations effectively.

Preparation of Macrometallocycle and Selective Sensor for Copper Ion