Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan.
RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan.
Nat Commun. 2018 Oct 25;9(1):4431. doi: 10.1038/s41467-018-06976-7.
Magnetic fields have been considered to only interact with organic materials non-destructively, leaving their fundamental structures unaffected, even when a strong magnetic field generated from a superconducting magnet is applied. Here we report an unprecedented observation that a liquid-crystalline mesophase of a diamagnetic molecular assembly with an orthorhombic or a cubic structure is formed selectively in the absence or presence of a strong magnetic field. The constituent molecule is a triphenylene derivative carrying six imidazolium bromide-terminated alkyl side chains and exhibits a cubic, orthorhombic, or hexagonal columnar mesophase when complexed with an appropriate amount of lanthanum(III) bromide. Thermal processing of the La-containing liquid-crystalline assembly in the presence of a 10-tesla magnetic field resulted in a phase diagram, in which the orthorhombic phase is completely replaced with the cubic phase. The discovery of this magneto-induced phase-selection offers an insight into the interactions between magnetic fields and organic material.
磁场被认为只会对有机材料产生非破坏性的相互作用，使其基本结构不受影响，即使施加来自超导磁体的强磁场也是如此。在这里，我们报告了一个前所未有的观察结果，即在没有或存在强磁场的情况下，各向异性的立方相液晶相选择性地形成于具有反铁磁性的分子组装体中。组成分子是一种三联苯衍生物，带有六个带有溴化咪唑端基的烷基侧链，当与适量的镧（III）溴化物复合时，表现出立方、正交或六方柱状液晶相。在 10 特斯拉磁场存在下对含镧的液晶组装体进行热加工，得到了一个相图，其中正交相完全被立方相取代。这种磁诱导相选择的发现为磁场与有机材料之间的相互作用提供了新的认识。
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