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Four novel polymeric iron(III) complexes with 2,2’-bipyridine (bipy) and   different aromatic polycarboxylato ligands as anions of phthalic (pht),   isophthalic (ipht), terephthalic (tpht) and pyromellitic (pyr) acid were   synthesized by ligand exchange reaction. The complexes were characterized by   elemental and TG/DSC analysis, FTIR and diffuse reflectance UV-VIS-NIR   spectroscopy and magnetic susceptibility measurements. Based on analytical   and spectral data the formulae of the complexes are {[Fe4(bipy)2   (H2O)2(OH)6(pht)3]•2H2O}n (1), {[Fe4(bipy)2(Hipht)2(ipht)2(OH)6]•4H2O}n (2),   {[Fe4(bipy)2(Htpht)2(OH)6(tpht)2]•4H2O}n (3) and {[Fe4(bipy)(H2O)8(OH)4   (pyr)2]•H2O}n (4). All complexes are red brown and low-spin with a distorted   octahedral geometry and FeO6 or FeN2O4 chromophore. Polycarboxylato ligands   have a bridging role in all cases, whereas monodentate COO groups are present   in 2 and 3, bridging and chelate COO groups are established in 1 and 4. The   thermal behaviour of 1-4 was investigated in detail and the molar dehydration   enthalpies were calculated. According to the all those results, the   structural formulae of the complexes 1-4 were proposed. [Projekat   Ministarstva nauke Republike Srbije, br. III45007

Synthesis and characterization of μ-hydroxido- and μ-polycarboxylato-bridged iron(III) complexes with 2,2’-bipyridine