New 3-D coordination polymers based on semi-rigid V-shape tetracarboxylates

• Structures of three tetracarboxylate-based coordination polymers were reported.
• Role of organic bases in metal–tetracarboxylate compounds was discussed.
• Characters of V-shape and semi-rigidity for tetracarboxylate play a key role in crystal growth.
• Their magnetic properties were investigated.

Under the hydrothermal conditions, the reactions of transition-metal salts, tetracarboxylic acids and N,N′-donor ligands yielded three new coordination polymers as [Cu4(fph)2(bpe)3(H2O)2]·2H2O (fph=4,4′-(hexafluoroisopropylidene)diphthalate, bpe=1,2-bis(pyridyl)ethylene) 1, [Co2(fph)(bpa)2(H2O)2]·3H2O (bpa=1,2-bis(pyridyl)ethylane) 2, and [Ni(H2O)(H2oph)(bpa)] (oph=4,4′-oxydiphthalate) 3. X-ray single-crystal diffraction analysis revealed that the title three compounds all possess the three-dimensional (3-D) network structures. For compound 1, the fph molecules first link the Cu2+ ions into a two-dimensional (2-D) wave-like layer with a (4,4) topology. The bpe molecules act as the second linkers, extending the 2-D layers into a 3-D network. For compound 2, the fph molecules still serve as the first connectors, linking the Co2+ ions into a one-dimensional (1-D) tube-like chain. Then the bpa molecules propagate the chains into a 3-D (4,4,4)-connected network. In the formation of the 3-D network of compound 3, the oph molecule does not play a role. The bpa molecules as well as the water molecules act as a mixed bridge. Only a kind of 4-connected metal node is observed in compound 3. The magnetic properties of compounds 1–3 were investigated and all exhibit the predominant antiferromegnetic magnetic behaviors.

Structures of three semi-rigid V-shape tetracarboxylate-based coordination polymers were reported, and their magnetic properties were investigated. Figure optionsDownload as PowerPoint slide