作者:Roy T. W. Huang、W. C. Wang、R. Y. Yang、J. T. Lu、Ivan J. B. Lin
DOI:10.1039/b907171g
日期:——
Three types of Au(I) N-heterocyclic carbene (NHC) and imidazole (Im) complexes, namely [Au(NHC)Cl], [Au(NHC)(Im)][NO3], and [Au(NHC)2][NO3], with two-, three-, and four-N-long alkyl chains, respectively, were synthesized and their mesomorphic properties investigated. Only the [Au(NHC)(Im)][NO3] series of compounds, adopting an m-shaped conformation in the solid state, showed liquid crystalline properties. For the molecules with three alkyl chains in particular, the Coulombic and hydrogen bonding interactions between the cationic head core and anionic NO3−, and the hydrophobic chain-chain interactions facilitate in sustaining the partially ordered motion, which is not observed for those with two and four arms. These complexes were employed for preparation of stable nanomaterials in organic solvents.
合成了三种类型的金(I) N-杂环卡宾(NHC)和咪唑(Im)配合物,分别为[Au(NHC)Cl]、[Au(NHC)(Im)][NO3]和[Au(NHC)2][NO3],其具有两条、三条和四条N长烷基链,并研究了它们的熵态特性。只有[Au(NHC)(Im)][NO3]系列化合物在固态下采用m形构象,显示出液晶特性。特别是对于具有三条烷基链的分子,阳离子头部核心与阴离子NO3−之间的库伦和氢键相互作用,以及疏水链间相互作用有助于维持部分有序的运动,而这种现象在具有两条和四条末端的化合物中并未观察到。这些配合物被用于在有机溶剂中制备稳定的纳米材料。