Assembly of silver(I) coordination polymers incorporating pyromellitic acid and N-heterocyclic ligands |
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| Authors: | Di Sun Na ZhangGeng-Geng Luo Qin-Juan XuRong-Bin Huang Lan-Sun Zheng |
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| Institution: | State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China |
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| Abstract: | Five mixed ligands coordination polymers Ag4(apym)2(pma)·(H2O)2]n (1), {Ag4(dmapym)4(pma)·(H2O)2]·(H2O)6}n (2), Ag2(apyz)2(H2pma)·(H2O)4]n (3), {Ag4(apyz)2(pma)·(H2O)2]·(H2O)2}n (4) and Ag4(NH3)8(pma)·(H2O)6]n (5) (apym = 2-aminopyrimidine, dmapym = 4, 6-dimethyl-2-aminopyrimidine, apyz = 2-aminopyrazine, H4pma = pyromellitic acid) were synthesized and characterized. For 1 and 2, as the substituents change from H to methyl, the dimensions of 1–2 decrease from three-dimension (3D) to one-dimension (1D) due to the steric effect of methyl groups. For 3 and 4, as the ratios of Ag2O/apyz/pma vary from 1:1:1 to 2:1:1, the structure of 3 is a 1D ladder structure built from Ag-apyz double chains and pma anions, while the structure of 4 is a two-dimension (2D) grid. As excess ammonia is added to above four reaction systems, the structure of 5 contains unprecedented {Ag(NH3)2]+}n chains and pma anions. The substituent on the pyrimidyl ring, ratios of reactants, solvent systems and ligand isomers intensively influence the coordination environments of metal ion and the coordination modes of the carboxyl group, and thus determine the structures of the coordination polymers. The photoluminescent properties of 1–5 were also investigated. |
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| Keywords: | Silver(I) 2-Aminopyrimidine 2-Aminopyrazine Pyromellitic acid Crystal structure Photoluminescence |
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