Low dimensional metal–organic frameworks (MOFs) constructed from simple aminopyrimidyl derivatives: From oligomer to single neutral zigzag chain and doubly ionic chains

Three low dimensional silver(I) complexes of the formula [Ag(L1)][Ag(L1)(CF3SO3)2] (1), [Ag2(L2)3(CF3SO3)2] (2), and [Ag(L2)(CF3CO2)]n (3), where L1 = 2-amino-4-methoxy-6-methylpyrimidine and L2 = 2-amino-4,6-dimethoxypyrimidine, have been synthesized and structurally characterized by single-crystal X-ray diffraction. Complex 1 is a new rarely reported AgI one dimensional (1D) coordination polymer, which consists of independently cationic and anionic doubly chains. The hydrogen bonds and Ag···O weak interactions between chains extend 1 into two dimensional (2D) interlayer networks. Complex 2 is a simple oligomer and two neighbored oligomers interact to produce a supramolecular dimer through hydrogen bonds, weak Ag···N(amino) interactions and anion–π interactions. Complex 3 displays 1D neutral zigzag chain which is structurally very similar to the 1D cationic one in 1, if neglecting counter anions in the former. The adjacent chains in 3 are further interlinked to generate 1D ladder structure via Ag···O weak interactions and N–H···O intermolecular hydrogen bonds. The results reveal that the nature of the counter anions and organic ligands all has great impact on the structure of the complexes. The luminescence properties of the synthesized silver complexes were also investigated in the solid state at room temperature.