Add time:08/15/2019         Source:sciencedirect.com

Two copper(II) complexes with the ortho-substituted phenoxyacetic acid, (2acetylphenoxy)acetic acid (RCO2H), 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-μ-[(2-acetylphenoxy)acetato-O,O′]-bis[copper(II)], [Cu2(RCO2)2]n, is extended into a polymer via the axial dimer sites through the acetyl carbonyl oxygens of adjacent units [Cu—O, 2.17](2) Å, Cu—Cu, 2.6401(6) Å]. The second complex 2, an adduct with 2-aminopyrimidine (2AP), catena-(2-aminopyrimidine-N,N′)-tetrakis-μ-[(2-acetylphenoxy)acetato-O,O′]-bis [copper(II)], [Cu2(RCO2)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) Å.; Cu—Cu, 2.6775(7) Å]. 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.

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