Chiral cyanido-bridged Mn-Nb magnets including halogen-bonds
Chiral cyanido-bridged Mn-Nb magnets including halogen-bonds
复制标题
包含卤素键的手性氰基桥联锰铌磁体
DOI：
10.1039/c8ce01353e
复制
发表时间：
2018
期刊：
影响因子：
3.1
通讯作者：
Ohkoshi Shin-ichi
中科院分区：
文献类型：
--
作者：
Ohno Takuro;Nakabayashi Koji;Imoto Kenta;Komine Masaya;Chorazy Szymon;Ohkoshi Shin-ichi
合成了三维氰根桥联的四元配合物[MnII（4-Xpy）4]2[NbIV（CN）8]·nH 2 O（4-Xpy：4-卤代吡啶; X = I，n = 0，（1）; X = Cl，n = 0.5，（2））. 1和2分别具有手性和非手性结构。1的手性结构由非手性结构单元组成，其通过自发拆分过程导致对映体纯的化合物。在1的晶体结构中，4-Ipy和氰化物之间的卤键扭曲了结构，降低了晶体对称性。1和2都显示亚铁磁性，居里温度（TC）分别为22 K和28 K。由于I41空间群中的手性和极性结构，1表现出SHG现象，而2由于其中心对称性，这种非线性光学现象被猝灭。
Three-dimensional cyanido-bridged bimetallic assemblies [MnII(4-Xpy)4]2[NbIV(CN)8]·nH2O (4-Xpy: 4-halopyridine; X = I and n = 0, (1); X = Cl and n = 0.5, (2)) are synthesized. 1 and 2 have chiral and achiral structures, respectively. The chiral structure of 1 is composed of achiral building blocks, which lead to an enantiopure compound through a spontaneous resolution process. In the crystal structure of 1, the halogen bonds between 4-Ipy and cyanide distort the structure, lowering the crystal symmetry. Both 1 and 2 show ferrimagnetism with Curie temperatures (TC) of 22 K and 28 K, respectively. Due to the chiral and polar structure in the I41 space group, 1 exhibits SHG phenomena, while such nonlinear optical phenomena are quenched in 2 due to its centrosymmetry.