Halogen bonds in two silver(I) mixed-ligand supramolecular frameworks: Synthesis, structure and photoluminescence

摘要

Two silver(I) tetrachlorophthalates incorporating aminopyrimidyl ligands, namely [Ag_4(apym)_4(tcpta)_2]_n (1) and [Ag_2(dmapym)(tcpta)]_n (2), (apym = 2-aminopyrimidine, dmapym = 2-amino-4,6-dimethylpyrimidine, H_2tcpta = tetrachlorophthalic acid), were synthesized and characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. Both 1 and 2 form sheets which are assembled into 3D supramolecular frameworks via halogen bonds, hydrogen bonds and π ? π interactions. Even adding two more methyl groups to the pyrimidyl ring does not change the dimensions of 1 and 2, but it influences the arrangement of the N- and O-donors in the solid state which in turn results in different types of halogen bonds. The photoluminescence properties of 1 and 2 were investigated in the solid state at room temperature.