Three binuclear Ln(III) complexes with formulas [Ln~2(phen)~2L], [phen=C~1~2H~8N~2, A Ln=Nd, L=(CH~3COO)~4(ONO~2); B Ln=Sm, L= (C~6H~5COO)~6; C Ln=Eu, L=(C~6H~5COO)~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 CH~3COO^- groups and coordinated to two phen and ONO~2^- groups, giving a binuclear Nd~2(phen)~2(ONO~2)~2(CH~3COO)~4 unit. This molecule possesses C~2 point group symmetry. The structures of the complexes B and C are completely same. They are centrosymmetric binuclear molecules with four benzoate bridges and two phen and two C~6H~5COO^- ligands. Every Ln atom is 9-coordinated in an irregular polyhedron. The distance of Ln-Ln is 0.397nm for complex A and 0.405nm for complexes B and C. Cryomagnetic investigations reveal a weak antiferromagnetic property only for the complex A.

Key words: DINUCLEAR COMPLEX, CRYSTAL STRUCTURE, MAGNETISM, FOUR- CIRCLE DIFFRACTOMETER, LANTHANON, NEODYMIUM COMPOUNDS, EUROPIUM COMPOUNDS, SAMARIUM COMPOUNDS