通过MnⅢnaphtmen H2O2ClO4(H2naphtmen=N,N'-二(2-羟基-1-萘甲醛)缩(1,1,2,2-四甲基乙二胺))和Li(TCNQ)(TCNQ=7,7,8,8-四氰基对苯二醌二甲烷自由基阴离子)反应,合成了一个中心对称的双氧桥联双核锰配合物MnⅣnaphtmen-O2(1).单晶X-射线衍射结果表明,配合物1属单斜晶系,2(1)/c空间群,a=13.277(3),b=10.066(2),c=16.960(3),β=97.28(3)°,V=2 248.2(8)3,Z=4,F(000)=760,μ=0.622 mm1,1=0.0438,w R2=0.112 2.中心Mn(Ⅳ)离子采取变形八面体的配位构型,分子内MnMn距离为2.7591,桥联键角Mn-O-Mn为99.36°.变温磁化率研究表明,配合物1双核单元内Mn(Ⅳ)离子间存在着弱的反铁磁相互作用:J=0.19 cm1,g=2.02.
One centrosymmetric di-μ-oxo dimanganese (IV) complex [MnW(naphtmen)(μ-O)]2 (1) was synthesized based on the reaction of [Mnm(naphtmen)(H2O)2]ClO4 (H2naphtmen = N, N'-bis (2-hydroxy-l-naphthalidene) -1,1,2,2- tetramethyl-1,2- diaminoethane) and Li (TCNQ) (TCNQ.- = 7, 7, 8, 8-tetracyanoquinodimethane radical monoanion). The X-ray single-crystal diffraction analysis shows that complex 1 crystallizes in space group P2 (I) /c with a = 13.277 (3) , b=10.066 (2) ,, c=16.960 (3) , β=97.28 (3) ° , V=2248.2 (8) 3, Z=4, F (000) =760, μ= 0.622 mm^-1, R1= 0.043 8 and wR2 = 0.112 2. The coordination polyhedron of each Mn (IV) ion can be described as a distorted octahedron. The intramolecular Mn-Mn distance is 2.7591 and the Mn-O-Mn angle is 99.36°. The temperaturedependent effective magnetic moment of complex 1 indicates that a weak intramolecular antiferromagnetic interaction between the two manganese (IV) ions (d3) exists. The best fit has given the parameters: J= -0.19 cm^-1, g = 2.02. Key words di-μ-oxo dimanganese (IV) complex; tetradentate Schiffbase; crystal structure; magnetic property