molecular orbital calculations. A good simulation of the EPR spectrum of a frozen solution (DMSO at 4 K) of compound 1 was obtained with g = 2.0, D = 0.1 cm−1, E = 0.01 cm−1. The EPR spectrum of a powdered sample of compound 1 shows a large broadening of the signal, due in part, to the important zero-field splitting of the hepta-coordinated Mn(II) ion.
五个五或七坐标的
锰配合物 hydr
配体已经准备好了。三个七坐标中性Mn II配合物:[Mn(dapA 2)] n (1),[Mn(dapB 2)(H 2 O)2 ](2),[Mn(dapS 2)(H 2 O)2 ](3)是从的双希夫碱合成的
2,6-二乙酰基吡啶:dap(AH)2,dap(BH)2和dap(SH)2 (AH =
蒽环酰
肼,BH =苯甲酰
肼,SH =
水杨酰酰
肼)。分别从单席夫碱dapBH和dapSH合成了两个八坐标的Mn II配合物:[Mn(dapS)2 ](4)和[Mn(dapB)2 ]·3H 2 O(5)。通过元素分析和IR对络合物进行了表征,紫外可见。,FAB质量,EI质量和 EPR光谱。的分子结构1,3 ·
DMF和4 ·
DMF已经通过单晶X射线衍射来确定。单席夫碱是单阴离子,而双席夫碱是双阴离子。八配位单席夫碱配合物4采用十二面体几何形状,而七配位双席夫碱配合物1形成一