Four cluster-based coordination polymers built on a semirigid tripod tricarboxylate ligand

By using a flexible multidentate carboxylate linker 4,4',4 ''-(((2,4,6-trimethylbenzene-1,3,5-triyl) tris(methylene))tris(oxy))tribenzoic acid (H3L), four novel coordination polymers [Mn7L4(DMF)(4)(H2O)(4)Cl-2]center dot 10(H2O) (1), [Cd7L4(DMF)(4)(H2O)(4)Cl-2]center dot 10(H2O) (2), [Co7L4(DMF)(4)(H2O)(4)(OH)(2)]center dot 11(H2O) (3), and [Co4L2(DMF)(2)(H2O)(4)Cl-2]center dot 4(DMF)center dot 3(H2O) (4) were obtained and characterized by single-crystal X-ray diffraction, thermogravimetric and magnetic studies. Compounds 1-3 are isomorphous, built upon a 12-connecting linear M-7 cluster and a 3-connecting L3- ligand to form a polycatenated 3D network. 4 comprises of 3-connecting trigonal M-2 clusters and L3- linkers to form a 2D layered structure with hcb topology. The magnetic studies of the M-7-cluster compounds 1 and 3 show the presence of antiferromagnetic interactions between the M2+ ions in 1 and 3.