Two-dimensional homochiral manganese(II)-azido frameworks incorporating an achiral ligand: partial spontaneous resolution and weak ferromagnetism.
Two-dimensional homochiral manganese(II)-azido frameworks incorporating an achiral ligand: partial spontaneous resolution and weak ferromagnetism.
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DOI：
10.1021/ja034129v
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发表时间：
2003-04
影响因子：
15
通讯作者：
E. Gao;Shiqiang Bai;Zheming Wang;Chunhua Yan
中科院分区：
文献类型：
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作者：
E. Gao;Shiqiang Bai;Zheming Wang;Chunhua Yan
通过在锰(II)-叠氮体系中加入非手性嘧啶配体2-吡啶甲基酮嗪，我们诱导了一个同手性二维网络，其中相邻的锰（II）离子通过一个嘧啶配体和两个端上的叠氮配体桥接成手性二聚体单元，相邻的单元通过单端到端叠氮桥连接。中间二聚体的手性保持是通过Mn（II）和端对端叠氮离子形成的一维同手性螺旋键实现的。二维层以异手性和同手性方式堆叠，同时产生外消旋和手性晶体，表明部分自发分辨率。这两种化合物都表现为自旋倾斜的弱铁磁体，但临界温度不同。
By incorporating an achiral diazine ligand, 2-pyridylmethylketazine, which can be locked in a chiral conformation upon coordination, into the manganese(II)-azido system, we induced a homochiral 2D network, in which neighboring Mn(II) ions are bridged via a diazine and two end-on azido ligands into chiral dimeric units, and neighboring units are interlinked via single end-to-end azido bridges. The interdimer chirality preservation is achieved via the homochiral 1D helical linkage formed by Mn(II) and end-to-end azido ions. The 2D layers are stacked in hetero- and homochiral fashion to yield simultaneously racemic and chiral crystals, indicating a partial spontaneous resolution. Both compounds behave as spin-canted weak ferromagnets, but the critical temperatures are different.