Polymer 3 having a tetradentate Schiff's base derivative of beta-diketone was prepared by polycondensation of a bis(beta-diketone) monomer (1) with 1,2-diaminocyclohexane (2). A polymer metal chelate in which all coordination sites of 3 were occupied with copper(II) ions was obtained. The polymer chelate was soluble in CHCl3, CH2Cl2, N,N-dimethylformamide, and tetrahydrofuran. Gel-permeation chromatography measurements showed that the complex formation with copper(II) ions induced changes in the conformation of 3 in solution.