A heterotrinuclear and a polynuclear complex constructed from a ferrocenyl carboxylate and an N-containing ligand: Synthesis, crystal structures and electrochemical properties

摘要

Treatment of Na0_2CCH=C(Me)Fc with cadmium acetate and iron(II) sulfate in the presence of 2,2'-bipy yielded [Cd_2Fe(_-O_2CCH=C(Me)Fc)_2(μ_2-0_2CCH=C(Me)Fc)_2(μ_2-η~2-O_2CCH=C(Me)Fc)_2(2,2'-bipy)_2] _ 2H_20 (1); while from Na0_2CC_6H_4{C(0)Fc-o), cadmium acetate, and pbbm the product was ([Cd(η~2_0_2CC_6H_4{C(0)Fc-o})_2(Pbbm)].0.5H_2O}_n (2) [Fc = (η~5-C_5H_5)Fe(C_5H_4-η~5); 2,2'-bipy = 2,2'-bipyridyl; pbbm = 1,1'-(1,5-pentamethylene)bis-1H-benzimidazole]. Compounds 1 and 2 have been characterized by elemental analysis, IR spectroscopy and single crystal X-ray diffraction. In centro-symmetric crystal_line 1, the Fe and the two flanking atoms are six-coordinate; the three carboxylato ligands between the Fe and a Cd atom have different coordination modes. Crystalline 2 consists of an infinite polymeric chain, in which adjacent [Cd(η~2-0_2CC_6H_4{C(0)Fc-o))_2] units are linked by pbbm ligands; thus each Cd atom is six-coordinate. Some electrochemical properties of the two complexes are reported.