No abstract

Copper complexes (2a-Cu and 2b-Cu) having two amino groups were prepared from paminobenzoylacetone (la) and 1-(4-aminophenyl)nonane-1,3-dione (lb) with copper(II) acetate, respectively. A soluble poly(azomethine) having /3-diketonato copper(II) complex in the main chain was prepared by the polycondensation of 2b-Cu with terephthalaldehyde (3) in dimethyl sulfoxide (DMSO) at room temperature with H 2 SO 4 as catalyst. After reprecipitation into methanol, a green product was obtained in 56% yield. The complex (5b-Cu) was soluble in common organic solvents such as CHC1 3 , tetrahydrofuran (THF), and DMSO. The number-average molecular weight (Mn) and molecular weight distribution of 5b-Cu determined by GPC were Mn = 3500 (polystyrene standard) and Mw !Mn = l. 71, respectively. The structure of 5b-Cu was supported by IR and elemental analysis. Thermogravimetric analysis (TGA) for 5b-Cu showed 5% weight loss at 250°C under nitrogen. Electrochemical data as well as absorption spectra of 5b-Cu in comparison with that of copper(II) bis[p-(l-aza-2-phenylethenyl)benzoylacetonate] (6) as a model compound show that the metal centers of the multinuclear complexes may be considered nearly independent of one another. KEY WORDS Poly(azomethine) / /3-Diketonate Copper(II) Complex/ Coordination Polymer I Metal-Containing Polymer I Cyclic Voltammetry /