Synthesis and Magnetic Properties of Novel Azamacrocyclic LnIII, CuII, FeIII, and SrII Complexes and Conformational Analysis of the Ligands
作者:Roxana Judele、Michael J. Dix、Sabine Laschat、Angelika Baro、Manfred Nimtz、Dirk Menzel、Joachim Schoenes、Klaus Doll、Gertrud Zwicknagl、Mark Niemeyer
DOI:10.1002/zaac.200700394
日期:2008.2
calorimetry and optical polarizing microscopy of 1 · MXn did not reveal any mesomorphism. The magnetic susceptibility shows deviation from Curie-like behavior. Due to ligand field effects the effective magnetic moments are a function of the temperature. In order to obtain structural informations on the free ligand 1, which is synthetically not accessible, theoretical calculations were carried out. For the
六烷氧基取代氮杂大环金属配合物1·MXn[MXn=FeCl3、CuCl2、SrCl2、Ln(NO3)3;Ln = La, Pr, Eu, Ho, Er] 使用 1,2-双烷氧基-4,5-二胺 3 和 4-烷氧基-吡啶-2,6-二甲醛 4 作为关键,通过收敛方法制备了具有不同链长的 Ln = La, Pr, Eu, Ho, Er]模板辅助环缩聚的构建块。金属络合物 1 MXn 被认为是潜在的金属异构体。然而,1·MXn 的差示扫描量热法和光学偏光显微镜未显示任何介晶现象。磁化率显示偏离居里行为。由于配体场效应,有效磁矩是温度的函数。为了获得合成上无法获得的游离配体 1 的结构信息,进行了理论计算。对于游离的氮杂大环 2a 和游离的六甲氧基取代的氮杂大环 1a,在密度泛函理论的水平上计算了红外光谱。考虑了平面和马鞍形构造。讨论了红外光谱,尤其是 C = N 振动对结构参数和电荷分布的依赖性。