Two supramolecular complexes Cu~2A~4(H~2O)~2 [A=CH~2=CH-COO^- and CH~2=C.(CH~3)-COO^-] have been synthesized, and characterized by elemental analyses, IR, ESR and magnetic studies. The single crystal X-ray diffraction shows that Cu~2(CH~2=CH-COO)~4(H~2O)~2 crystallizes in the monoclinic space group C2/c, with a=1.7009(9)nm, b=0.8060(5)nm, c=1.4429(4)n, β=109.31(5)ⅲ, Z=4 and R=0.0501. Two copper(II) atoms are bridged by four acrylate groups. Each copper(II) atom is coordinated with H~2O molecule in axial position, forming a distorted square pyramidal configuration. The symmetric center is between the two copper(II) atoms. The Cu-Cu bond distance is 0.26096 (14)nm. The Cu-Cu distance and magnetic studies suggest that there exists an antiferromagnetic interaction between the two copper(II) atoms. Two adjacent molecular units are linked by two hydrogen bonds (O...O=0.2833nm), forming a one-dimensional chain supramolecular complex along c axis.

Key words: COPPER COMPLEX, CRYSTAL STRUCTURE, MAGNETISM, ACRYLIC ACID P, METHYLPROPENOIC ACID P, ELEMENTAL ANALYSIS, INFRARED SPECTROPHOTOMETRY, ELECTRON SPIN RESONANCE