Abstract
A new multidentate ligand 2-(pyridin-2-ylthio) pyrimidine (abbreviated as Pypm) reacts with silver nitrate, silver trifluoroacetate and copper dichloride, obtaining coordination polymers [Ag(Pypm)(NO3)]∞ (1), [Ag(Pypm)(CF3COO)]∞ (2), and dinuclear [Cu2(Pypm)2(Cl)4] (3), respectively. In complexes 1 and 2, the Pypm ligand takes an unvaried nonplanar configuration with two aromatic rings in an orthogonal orientation, exhibiting a N,N’-μ2-bridging mode linked to separated Ag(I) ions. Interesting intramolecular Npyrimidyl···Cpyridyl contact occurs and stabilizes the nonplanar configuration of Pypm in supramolecular architectures of 1–2. Different coordination abilities and steric geometries between NO3− (in 1) and CF3COO− (in 2) exhibit subtle tuning on the forming of homochiral helix structure in 1 and double-bridged chain in 2. While, in copper(II) complex 3 Pypm takes a κ2N,N-chelating mode to combine the η: η: μ2-bridging Cl− to form a dinuclear complex. The effect of counter anion on construction of a supramolecular architecture and the ligand behavior of the angular-shaped pyridyl-based sulfide ligand are observed and discussed.
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