Synthesis, crystal structures and characterization of iron(III) and cobalt(III) complexes bearing 2,2′-bipyridylcarboxylate ligands
Transition Metal Chemistry(2019)
Abstract
The Fe(III) complex [Fe III (bpdc)(Hbpdc)] ( 1 ) (bpdc = 2,2′-bipyridyl-6,6′-dicarboxylate and Hbpdc = 2,2′-bipyridyl-6′-carboxyl-6-carboxylate) and the Co(III) complex [Co III (bpc) 2 ]PF 6 ( 2 ) (bpc = 2,2′-bipyridyl-6-carboxylate) have been synthesized by the reactions of 2,2′-bipyridyl-6,6′-dicarboxylic acid (H 2 bpdc) with the corresponding metal salts under hydrothermal conditions. The X-ray crystal structures of complexes 1 and 2 were determined. Both of them are mononuclear compounds. In complex 1 , the iron center is eight-coordinated by one bpdc ligand and one Hbpdc ligand resulting in a distorted dodecahedron geometry. On the other hand, decarboxylation of H 2 bpdc occurred in the preparation of compound 2 , which is six-coordinated by two bpc ligands with a distorted octahedral geometry. The complexes were further investigated by spectroscopic methods, thermal gravimetric analyses or cyclic voltammetry.
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