Syntheses, characterization, crystal structure and magnetic properties of copper(II) alpha,beta-unsaturated carboxylate complexes with trimethyl phosphate

Two ternary complexes Cu(2)A(4)[OP(OCH3)(3)](2) (A represents CH2=CH-COO- a nd CH2=C(CH3)-COO-) have been synthesized, and elemental analyses, IR, ESR, electronic reflectance spectra and magnetic studies were carried out. The single crystal X-ray diffraction shows that Cu-2[CH2= (OCH3)-COO](4)[OP(OCH 3)(3)](2) is triclinic, with space group P (1) over bar, a = 1.05128(13), b = 1.7559(5), c = 1.94479(3) nm, alpha = 91.263(14)degrees, beta = 102.559( 6)degrees, gamma = 106.339(13)degrees, Z = 4 and R = 0.0668. Two copper(II) atoms are bridged by four alpha -methacrylate groups, and each copper(II) atom is coordinated with a trimethyl phosphate molecule in the axial positi on, forming a distorted square pyramidal configuration. The symmetric cente r is between the two copper(II) atoms, and the Cu-Cu bond distance is 0.260 98(6) nm. The Cu-Cu distance and magnetic studies suggest that there exist antiferromagnetic interactions between the two copper(II) atoms.