American Chemical Society
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Two-Dimensional Homochiral Manganese(II)-Azido Frameworks Incorporating an Achiral Ligand:  Partial Spontaneous Resolution and Weak Ferromagnetism

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journal contribution
posted on 2003-04-03, 00:00 authored by En-Qing Gao, Shi-Qiang Bai, Zhe-Ming Wang, Chun-Hua Yan
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.