Synthesis, crystal structure, spectroscopic, thermal analyses and biological properties of novel F-block coordination polymers containing 2,2′-thiodiacetic acid and piperazine

•Three new coordination polymers have been synthesized and characterized.•Their antibacterial activities against some microorganism have been reported.•Complicated hydrogen bonding networks connected the various components of 1–3 into a 3D-supramolecular architecture.

Three new 1D and 2D coordination polymers, {(pipH2)[Ce2(tda)4(H2O)2]·2H2O}n (1), {[Nd2(tda)3(H2O)2]·H2O}n (2) and {(pipH2) [UO2(tda)2]}n (3), where [tdaH2 = 2,2′-thiodiacetic acid and pip = piperazine] have been synthesized and characterized by elemental analysis, spectral (IR, NMR, UV–Vis and luminescence), thermal (TGA/DTA) analysis, as well as X-ray single crystal diffraction. Compounds 1 and 3 are proton transfer salts of the piperazindiium cation and metal complex anions that crystallized in a solution from dicarboxylic acid, piperazine and metal nitrates or acetates as starting materials. However compound 2 is an interesting neutral 2D coordination polymer containing just 2,2′-thiodiacetate dianions. The acid is coordinated to metal center in a bidentate fashion in 2 and 3 while in 1, coordinated to metal center as bidentate and tridentate, simultaneously. The coordination polyhedron around metal center in 1, 2 and 3 can be described as distorted tricapped trigonal prismatic and distorted hexagonal bipyramidal, respectively. The complicated hydrogen bonding networks connected the various components of 1–3 into a 3D-supramolecular architecture. The 1–3 compounds, tdaH2, pip and metal salts were additionally tested in vitro against three Gram-positive microorganisms (Staphylococcus aureus, Staphylococcus epidermidis and Bacillus subtilis) and three Gram-negative microorganisms (Escherichia coli, Serratia marcescens, and Pseudomonas aeruginosa) to assess their antibacterial properties. The results of antibacterial assays indicated that compound 1 has higher activity than compounds 2 and 3 against the tested Gram-positive bacteria and also compound 2 has better activity compared to 1 and 3 against the tested Gram-negative bacteria.

Graphical abstractThree new coordination polymers of Ce(III), Nd(III), and U (VI) with 2,2′-thiodiacetic acid and piperazine were synthesized and characterized by the methods of elemental, spectroscopic (IR and UV–Vis, NMR), thermal (TG/DTG, DTA) analysis as well as single crystal X-ray diffraction. Their antibacterial activities also were investigated against some microorganisms.Figure optionsDownload full-size imageDownload as PowerPoint slide