Schiff碱双核Mn配合物的合成、结构和性能研究

Synthesis,Structure and Properties of Binuclear Manganese Complexes with Schiff Base Ligands

Five manganese complexes of Schiff b ase were synthesized:[Mn Ⅳ,Ⅳ (μ-O)(Salen)] 2 ·DMF ·H 2 O(1),[Mn Ⅳ,Ⅳ (μ-O)(5-BrSalen)] 2 ·DMF ·0.5H 2 O(2),[Mn Ⅳ,Ⅳ (μ-O)]al(1,2-pn)[nr 2 ·H 2 O(3),]Mn Ⅳ,Ⅳ (μ-O)[5-Br-Sal(1,2-pn)]r 2 ·H 2 O(4),[Mn Ⅳ,Ⅳ (μ-O)]5-CH 3 -Sal(1,2-pn)5-CH 3 -Sal(1,2-pn)[ 2 ·2H 2 O(5),and were characterized by element analysis,IR and UV-Vis spec tra.The results of cyclic voltammogram show that Schiff base ligands can drop the potential of manganese and s teady high oxide state of manganese.The magnetic properties of1and3have also been studied.The results show t hat there is a weak ferromagneticall y coupling of Mn Ⅳ2 pair at room and low temperature,and the interactions o f complex3are weaker than complex1.

Five manganese complexes of Schiff base were synthesized: [ Mn (IV.IV) (mu-O) (Salen) ] (2) . DMF . H2O (1), [Mn-IV.IV (mu-O) (5-BrSalen)](2) . DMF . 0.5H(2)O (2), {Mn-IV.IV(mu-O) [ Sal(1, 2-pn)]}(2) . H2O (3), {Mn-IV.IV (mu-O) [5-Br-Sal (1, 2-pn)]}(2) . H2O (4), {Mn-IV.IV(mu-O) [ 5-CH3-Sal (1, 2-pn)]}(2) . 2H(2)O (5), and were characterized by element analysis, IR and UV-Vis spectra. The results of cyclic voltammogram show that Schiff base ligands can drop the potential of manganese and steady high oxide state of manganese. The magnetic properties of 1 and 3 have also been studied. The results show that there is a weak ferromagnetically coupling of Mn-2(IV) pair at room and low temperature, and the interactions of complex 3 are weaker than complex 1.