Syntheses, structures, and properties of a series of 2D and 3D coordination polymers based on trifunctional pyridinedicarboxylate and different (bis) imidazole bridging ligands

A series of 2D and 3D transition coordination polymers (CPs), {[M(bcpb)(1,4-bmib)(0.5)]center dot xH(2)O}(n) (M = Co (1), Cu (2), Ni (3), x = 1 for 1, 0 for 2 and 3), {[Co(bcpb)(4,4'-bibp)(0.5)(H2O)(1.5)]center dot 1.5H(2)O}(n) (4), [Cu(bcpb)(4,4'-bibp)(0.5)(H2O)](n) (5), {[Ni(bcpb)(4,4'-bimbp)(H2O)]center dot 2.5H(2)O}(n) (6), [Co(bcpb)(4,4'-bimbp)](n) (7), [Mn(pip)(MeOH)(H2O)](n) (8), {[Ni(pip)(4,4'-bibp)(0.5)(H2O)]center dot 2H(2)O} n (9), and {[Cu(pip)(4,4'-bimbp)]center dot 4H(2)O} n (10), were synthesized under hydrothermal conditions in the presence of two trifunctional pyridinedicarboxylates and different (bis) imidazole bridging linkers (H(2)bcpb = 3,5-bis(4-carboxyphenyl) pyridine, H(2)pip = 5-(4-pyridyl) isophthalic acid, 1,4-bmib = 1,4-bis(2-methylimidazol-1-ylmethyl) benzene), 4,4'-bibp = 4,4'bis( imidazol-1-yl) biphenyl, 4,4'-bimbp = 4,4'-bis(imidazol-1-ylmethyl) biphenyl). Their structures have been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectra, powder X-ray diffraction (PXRD), and thermogravimetric (TG) analyses. Single crystal X-ray diffraction analyses reveal that complexes 1-3 are isomorphic and show complicated 3D (3,5)-coordinated amd networks, which could be viewed as two interpenetrated ths nets. Complex 4 is a binodal (3,4)-connected 3D framework with the Schl fli symbol of (4 center dot 7(2))(4 center dot 7(5)center dot 8(4)). Complex 5 exhibits an intriguing 3D 2-fold interpenetrated network with the (3,4)-connected dmc net. Complex 6 is a 2D (3,5)-connected gek1 net with right-and left-handed [Ni(4,4'-bibp)](n) helical chains arranged alternately. The 3D framework of 7 is defined as a 2-fold interpenetrated (3,5)-connected gra topology. Complex 8 displays a 2D 3-connected 6(3)-hcb network. Complex 9 can be regarded as a (3,4)-coordinated crs-d network with a point symbol of (6(2 center dot)8)(6(3 center dot)8 center dot 10(2)), which contains two interpenetrated 3-coordinated 10(3) srs subnets linked by 2-coordinated 4,4'-bibp. Complex 10 is a binodal (3,5)-connected 3D framework with point Schl fli symbol of (4 center dot 6 center dot 8)(4 center dot 6(4)center dot 8(5)). To the best of our knowledge, the 3D CPs with (3,4)-connected (4 center dot 7(2))(4 center dot 7(5)center dot 8(4)) for 4, and (3,5)-connected (4 center dot 6 center dot 8)(4 center dot 6(4)center dot 8(5)) for 10 have never been documented up to now. Moreover, the magnetic properties of 4 have been investigated.