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  • Title: Structural diversity and magnetic properties of six metal-organic polymers based on semirigid tricarboxylate ligand of 3,5-bi(4-carboxyphenoxy)benzoic acid.
    Author: Fan L, Fan W, Song W, Sun L, Zhao X, Zhang X.
    Journal: Dalton Trans; 2014 Nov 14; 43(42):15979-89. PubMed ID: 25233393.
    Abstract:
    Solvothermal reactions of the semirigid 3,5-bi(4-carboxyphenoxy)benzoic acid (H3BCP) and transitional metal cations with the help of three ancillary bridging imidazole linkers afforded six coordination polymers, namely, [Co(HBCP)(1,4-bib)0.5]n (), {[Mn1.5(BCP)(1,4-bib)0.5(μ2-H2O)(H2O)2]·(1,4-bib)0.5}n (), {[Mn0.5(1,4-bib)(H2O)]·(H2BCP)}n (), {[Fe(BCP)0.5(HCOO)0.5(4,4'-bibp)0.5]·2H2O}n (), [Ni2.5(HBCP)(BCP)(4,4'-bibp)2(μ2-H2O)(H2O)2]n (), and [Ni(HBCP)(1,4-bidb)1.5(H2O)2]n (), (1,4-bib = 1,4-bis(1H-imidazol-4-yl)benzene, 1,4-bidb = 1,4-bis(1-imidazol-yl)-2,5-dimethyl benzene, 4,4'-bibp = 4,4'-bis(imidazol-1-yl)biphenyl). Their structures and properties were determined by single-crystal and powder X-ray diffraction analyses, IR spectra, elemental analyses, thermogravimetric analyses (TGA), and X-ray photoelectron spectroscopy (XPS). Complex displays unusual 2D + 2D→2D parallel entangled networks consisting of (3,4)-connected 3,4L83 sheets. Complex exhibits an interesting 2-fold interpenetrated framework with a trinodal (4,4,6)-connected (3·4·5·6(2)·7)2(3·6·7(4))2(3(2)·4(2)·5(2)·6(2)·7(6)·9) topology. The host network of complex is a 2D 4-connected (4(4)·6(2))-sql sheet. Complex affords unprecedented 3D (4,6,6)-coordinated framework with point symbol of (4(5)·6)(4(8)·6(7))(4(9)·6(3)·8(3))2, in which the 1D helix water chains occupy the void channels. Complex can be regarded as a novel self-penetrating (4,4,4,5)-coordinated framework with point symbol of (4·5(4)·6)2(4·6(5)·7·8(3))2(5·6·7·8(3))2(5(2)·8(3)·9(2)), which contains two interpenetrated (3,4,4,5)-coordinated (4·5(4)·6)2(4·6(5)·7·8(3))2(5·6·7)2(5(2)·8(3)·9(2)) subnets linked by μ2-H2O. Complex shows a 1D ladder chain, which are further assembled into a 3D supramolecular structure via O-HO and ππ interactions. Moreover, magnetic studies indicate that both complex and show antiferromagnetic properties.
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