Syntheses, characterizations, thermal stability and photoluminescence of four silver coordination polymers with mixed ligands

• Complex 1 features 3D structure which consists of 1D helical silver chains.
• Complex 2 possesses infinite silver chains with repeated Ag-triangle units.
• Complex 3 exhibits 2D 44-sql network with the 1D double chains.
• Complex 4 shows Ag6 units in the 3D coordination network.
• The photoluminescence behaviours of the complexes were discussed.

Four silver(I) coordination polymers (CPs), namely, [Ag2(mpyz)(ipa)]n (1) [Ag3(mpyz)(btc)]n (2) [Ag4(apyz)2(ipa)·0.5 DMF]n (3) [Ag3(apyz)2(btc)]n (4), have been purposefully synthesized under ultrasonic treatment of methylpyrazine (mpyz), aminopyrazine (apyz), isophthalic acid (H2ipa), 1,3,5-benzenetricarboxylic acid (H3btc) and AgNO3. And they were characterized by elemental analysis and X-ray single-crystal diffraction. Complexes 1 and 2 based on the same auxiliary ligand mpyz show various structures with silver chain. Complex 1 features a three-dimensional (3D) structure which consists of 1D helical silver chains. Complex 2 possesses an infinite silver chain with repeated Ag-triangle units. Complexes 3 and 4 with apyz as auxiliary ligand exhibit different structures. Complex 3 exhibits a 2D 44-sql network with the 1D double chains and complex 4 shows Ag6 units which are connected by Ag⋯Ag interaction in the 3D coordination network. Effects of the aromatic polycarboxylates on the structures and the intricacy of the self-assembly process were discussed. Additionally, results about infrared spectroscopy (IR), thermogravimetric analyses (TGA) and photoluminescence spectra behaviours of the compounds were also discussed.

Four novel silver complex were synthesized under ultrasonic treatment. Complexes 1 and 2 show silver chains in the construction. The structures of 3 and 4 contain Ag2 and Ag6 units. Complexes 1 and 2 were synthesized as below.Figure optionsDownload as PowerPoint slide