Metal phenoxyalkanoic acid interactions .38. Structures of the polymeric copper(II) complexes of (2-acetylphenoxy)acetic acid: Catena-tetrakis-mu-[(2-acetulphenoxy)acetato-O,O']-bis[copper(II)] and catena-(2-aminopyrimidine-N,N')-tetrakis-mu-[(2-acetylphenoxy)aceto-O,O')-bis[copper(II)]

Two copper(II) complexes with the ortho-substituted phenoxyacetic acid, (2-acetylphenoxy)acetic acid (RCO(2)H), have been prepared and their crystal structures determined by X-ray diffraction. Both are polymers based on tetracarboxylato-bridged dimer units of the copper acetate hydrate type. Complex 1, catena-tetrakis-mu-[(2-acetylphenoxy)acetato-O, O']-bis[copper(II)], [Cu-2(RCO(2))(2)](n), is extended into a polymer via the axial dimer sites through the acetyl carbonyl oxygens of adjacent units [Cu-O, 2.171(2) Angstrom, Cu-Cu, 2.6401(6). Angstrom]. The second complex 2. an adduct with 2-aminopyrimidine (2-AP), catena-(2-aminopyrimidine-N,N')-tetrakis-mu-[(2-acetylphenoxy)acetato-O, O']-bis [copper(II)], [Cu-2(RCO(2))(4)(2-AP)](n), forms a zig-zag chain polymer through the heteronitrogens of the 2-AP ring [Cu-N, 2.191, 2.217(2) Angstrom; Cu-Cu, 2.6775(7) Angstrom]. These chains are stabilized by the presence of hydrogen bonding between the 2-amino group of 2-AP and the carboxyl oxygens of adjacent dimers.