Abstract
A series of fluorene-bridged bisazolium salts L1H2·X2-L6H2·X2 (X = Br– or PF6–) and six related N-heterocyclic carbene silver(I) complexes [(L1Ag)2](NO3)2 (1), {[L2Ag2(CH3CN)2]2}(PF6)4 (2), [(L3Ag)2(Ag2Br4)]n (3), [(L4Ag) (NO3)]n (4), [L5Ag2Br2]n (5), and [L6(AgCl)2] (6) have been synthesized and characterized. Each cationic moiety of 1 or 2 contained one 28-membered macrometallocycle formed via two silver(I) ions and two biscarbene ligands (L1 for 1 and L2 for 2). 1D coordination polymeric chains of 3–5 were formed by different monomers. The open structure of 6 was formed through one biscarbene ligand L6 and two [AgCl] units, in which two [AgCl] units pointed to opposite directions. Additionally, the recognition performance of 2 to Cu2+ was researched through fluorescence spectra, UV/vis spectra, 1H NMR titrations, HRMS, IR spectra, and the quantum chemical computations. The results showed that 2 can effectually differentiate Cu2+ from other cations.
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