Synthesis and Crystal Structure of Novel Cyclic Tetranuclear Manganese(Ⅱ)Complex With Ferromagnetic Coupling

摘要

Three novel 16-member macrocyclic complexes containing 4 manganese atoms on ring and 2phthalate as bridging ligand have been synthesized.The composition of the complexes has been determinedby elemental analyses and characterized by IR and magnetic balance.The crystal structure of the complex[Mn4（μ-phth）2（bpy）8]（ClO4）·3H2O has been determined.Crystal data:space group P （?）,with a=14.276（6）,b=14.369（9）,c=15.540（1） （?）,α=70.22（5）,β=61.73（6）,γ=66.38（5）°,Z=1.The vari-able-temperature magnetic susceptibility （4-300 K） of [Mn4 （μ-phth）2（bpy）8] （ClO4）4·3H2O and [Mn4（μ-phth）2（phen）8]（ClO4）)4·2H2O has been determined and the susceptibility data are least squares fit tothe susceptibility equation derived from the spin Hamihonian （?）=-2J（（?）1·（?）2+（?）2·（?）3+（?）3·（?）4+（?）1·（?）4）.The exchange intergral,J,has been found equal to 0.53 cm-1（bpy） and 0.23 cm-1（phen）.This indi-cates a weak ferromagnetic spin exchange interaction among the metal ions.