Construction of three 2-D silver(I) coordination architectures with a flexible pyrazine-based ligand

Abstract

To investigate the impact of weak intermolecular interactions in construction of metal–organic frameworks, three silver(I) coordination complexes with the flexible N-heterocyclic ligand 1-((2-pyrazinyl)-1H-benzoimidazol-1-yl)methyl)-1H-benzotriazole (PBMBT), {Ag(C₁₈H₁₃N₇)NO₃} _n (1), {Ag(C₁₈H₁₃N₇)ClO₄} _n (2), and {Ag(C₁₈H₁₃N₇)SO₃CF₃} _n (3), were prepared under solvothermal conditions and structurally characterized by single-crystal X-ray diffraction, IR spectrum, and elemental analyses. Complexes 1–3 exhibit 2-D reticulate structures, and these 2-D layers are further connected into 3-D supramolecular motifs by π···π interactions and hydrogen bonds. Luminescence indicates that 1–3 show analogous fluorescent emissions compared with the PBMBT in the solid state at room temperature.

Keywords:

• Metal–organic framework
• Flexible ligands
• Crystal structure
• Photoluminescence properties

Acknowledgments

We gratefully acknowledge the financial support by the Talent Supporting Plan of He’nan Scientific and Technological Innovation (No. 2010HASTIT016) and the He’nan key science and technology research (Nos 102102310079, 112102310084, and 122 102 310 061).