Four triazole-bridging coordination polymers containing (m-phenol)-1,2,4-triazole: Syntheses, structures and properties of fluorescence and magnetism

Four triazole-bridging coordination complexes, [Zn4(ptr)2(SO4)3(μ3-OH)2(H2O)4]n (1), [Hg(CN)2(ptr)]n (2), [Hg(Cl)2(ptr)]n (3), and [Cu2(μ2-ptr)2(μ2-F)2]n(SiF6)n·2nH2O (4), were synthesized with (m-phenol)-1,2,4-triazole (ptr). Compounds 1–4 with extended structures of 4-substituted 1,2,4-triazole are rarely reported. The layered structure of 1 can be regarded as constructed from the 2-D inorganic backbone of SO42−(2) anions bridging [Zn4(μ3-OH)2(H2O)2]6− subunits with the ptr ligands anchoring to both sides of backbone. Compounds 2 and 3 are the first mercury(II) complexes with 4-substituted 1,2,4-triazole, which feature the ptr ligand acting as a bidentate ligand bridging the Hg(II) atoms to form arciform –Hg–ptr–Hg–ptr chains. The structure of 4 is constructed from the F atoms bridging Cu atoms in symmetrical μ2-coordination mode to form a zigzag cationic chain with each ptr ligand bridging a pair of Cu atom on the both sides, resulting in a nonplanar 5-membered [Cu2N2F] ring. Fluorescent properties of 1–4 were characterized and the magnetic property of 4 shows antiferromagnetic interaction between the copper(II) ions.