Syntheses, structures, and properties of four novel Ag(I) coordination polymers based on 2,6-dimethylpyrazine and benzene dicarboxylates

Four silver(I) coordination polymers based on 2,6-dimethylpyrazine(dmpz), {Ag-2(dmpz)(L-1)}(n) (1), {Ag-2(dmpz)(L-2)}(n) (2), {Ag-2(dmpz)(L-3)(0.5)center dot H2O}n (3) and {Ag-6(dmpz)(6)(L-4)(2)center dot 2H(2)O}(n) (4) (H2L1 = 5-Nitroisophthalic acid, H2L2 = 3-Nitrophthalic acid, H4L3 = Pyromellitic acid, H2L4 = 5-Sulfoisophthalic acid), were synthesized under the ammoniacal condition in mixed solvents and characterized by elemental analyses, IR spectra and single-crystal X-ray diffraction. 1 contains rhombic Ag-4 unit, but 4 exhibits Zigzag Ag-4 unit, both with 2D double layer architecture. In 2, L-2 anions link Ag pairs into 1D corrugated chains, which are further connected by dmpz ligand into 2D 4(4)-sql network. 3 possess 3D supramolecular framework resulting from Ag-O and Ag-N interaction and Zigzag Ag-4 units. Ag-Ag interactions exist in four coordination polymers. Benzene dicarboxylates and pyrazine ligands play vital roles in formation of the multiple architectures. Photoluminescence and thermogravimetry of the complexes were also measured. (C) 2017 Elsevier B.V. All rights reserved.