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The synthesis and characterization of the copper(II) complex [Cu_2(OOCCH=C(CH_3)Fc)_3(phen)_2]ClO_4·2H_2O (1) are reported. The structure of the complex was determined by single-crystal X-ray analysis. The compound crystallizes in the monoclinic system,space group Pc ,with Z =2,a =1.2799(4) nm,b =0.9969(4) nm,c =2.5228 nm,and β =91.576(1)°. The cationic part of 1 indicates a penametallic core in which three 3-ferrocenyl-2-crotonic acid salt (FCA) groups act as (O,O’) bridging ligands between two copper(II) ions with a square-pyramidal environment. Cyclic voltammetric experiments in acetonitrile have been performed mainly to examine the Fe(II) → Fe(III) one-electron oxidation in FCA and its complex. The variable-temperature magnetic susceptibility measurements revealed very weak intramolecular anti-ferromagnetic coupling. Fitting parameters are 2 J =-0.2 cm -1 ,g =2.114,and θ =0 K.
The synthesis and characterization of the copper (II) complex [Cu_2 (OOCCH = C (CH_3) Fc) _3 (phen) _2] ClO_4 · 2H_2O (1) are reported. The structure of the complex was determined by single- ray analysis. The compound crystallizes in the monoclinic system, space group Pc, with Z = 2, a = 1.2799 (4) nm, b = 0.9969 (4) nm, c = 2.5228 nm, and β = 91.576 (1) °. The cationic part of 1 (3) means that a penametallic core in which three 3-ferrocenyl-2-crotonic acid salt (FCA) groups act as (O, O ’) bridging ligands between two copper (II) ions with a square-pyramidal environment. The variable-temperature magnetic susceptibility measurements revealed very weak intramolecular anti-ferromagnetic coupling. Fitting parameters are 2 J = -0.2 cm -1, g = 2.114, and θ = 0 K.