H4ppha. Complex 5 is the first Mn6 cluster linked by two stacked, off-set 8-azametallacrown-3 subunits with [M–N–N–M–N–N–M–O] connectivity, and L4 derived from the esterification of L1. The magnetic behaviour of complexes 1–5 show the dominant antiferromagnetic interactions between metal centers, whereas complex 5 further reveals the coexistence of antiferromagnetic and ferromagnetic interactions, and
五种
锰配合物[Mn 2(L 1)2(Py)4 ](1),[Mn 2(L 1)2(
DMSO)4 ](2),[Mn 4(L 2)4(OH)4 ](3),[Mn 4(L 3)2(
DMSO)7(H 2 O)](4)和[Mn 6 O 2(L 4)4(OAc)2(OMe)2(
DMSO)4 ]·MeOH](5),(H 3 L 1 = 5-(2-氧苯基)-
吡唑-3-
羧酸; H 2 L 2 = 5-(2-氧苯基)-
吡唑-3-
羧酸酰胺; H 4 L 3=二-[5-(2-氧苯基)-
吡唑] -3-异羟
肟酸酯; H 2 L 4= 5-(2-氧苯基)-
吡唑-3-羧酸甲酯)的报道。通过X射线单晶衍射,IR,元素分析,热重分析和UV-vis光谱对五种配合物进行了表征。分析显示复合物1和2具有双
金属六元环和L 1的同构结构,其中L 1来自原始H 4 ppha(H 4 ppha = 5-(2-羟基苯基)-
吡唑-3-异羟
肟酸)