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

Under the hydrothermal conditions, the reactions of transition-metal salts, tetracarboxylic acids and N , N ′-donor ligands yielded three new coordination polymers as [Cu 4 (fph) 2 (bpe) 3 (H 2 O) 2 ]·2H 2 O (fph=4,4′-(hexafluoroisopropylidene)diphthalate, bpe=1,2-bis(pyridyl)ethylene) 1 , [Co 2 (fph)(bpa) 2 (H 2 O) 2 ]·3H 2 O (bpa=1,2-bis(pyridyl)ethylane) 2 , and [Ni(H 2 O)(H 2 oph)(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 Cu 2+ 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 Co 2+ 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. [ABSTRACT FROM AUTHOR]