Crystal structures and magnetism of the binuclear Ln(III) complexes

Three binuclear Ln(III) complexes with formulas [Ln(2)(phen)(2)L], [phen = C12H8N2, A Ln = Nd, L= (CH3COO)(4)(ONO2); B Ln = Sm, L = (C6H5COO)(6); C Ln = Eu, L = (C6H5COO)(6)] have been synthesized. Their molecular structures and crystal structures have been determined by X-ray diffraction analysis. In the complex A, two Nd(III) ions are bridged by four CH3COO- groups and c oordinated to two phen and two ONO2- groups, giving a binuclear Nd-2(phen)( 2)(ONO2)(2)(CH3COO)(4) unit. This molecule possesses C-2 point group symmet ry. The structures of the complexes B and C are completely same. They are c entrosymmetric binuclear molecules with four benzoate bridges and two phen and two C6H5COO- ligands. Every Ln atom is 9-coordinated in an irregular po lyhedron. The distance of Ln - Ln is 0.397nm for complex A and 0.405nn for complexes B and C. Cryomagnetic investigations reveal a weak antiferromagne tic property only for the complex A.