Intermolecular Interaction-Induced Hierarchical Transformation in 1D Nanohybrids: Analysis of Conformational Changes by 2D Correlation Spectroscopy

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• 作者：Ho Seok Park ; Yeong Suk Choi ; Young Mee Jung ; Won Hi Hong
• 刊名：Journal of the American Chemical Society
• 出版年：2008
• 出版时间：January 23, 2008
• 年：2008
• 卷：130
• 期：3
• 页码：845 - 852
• 全文大小：706K
• 年卷期：v.130,no.3(January 23, 2008)
• ISSN：1520-5126

文摘

We have examined both self-assembly and confinement effect in room-temperature ionic liquid(RTIL)-aluminum hydroxide hybrids (RAHs) to attain a fundamental understanding of special phenomenain nanoscale spaces as well as to design functional nanomaterials for practical applications. Phase-controlledone-dimensional (1D) RAHs were synthesized through a simple ionothermal process. The RAHs werehierarchically transformed in terms of the molecular structures, morphologies, and phases of the materialsduring the ionothermal process with respect to the concentration of RTIL. In addition to the hierarchicaltransformation, the RTIL/aluminum hydroxide nanohybrids revealed unexpected physical behaviors, includingthermal transition variation of the RTIL in confined environments and a phase transition from nanosolid tonanoliquid affected by changes of the melting points. More importantly, intermolecular interaction induced-self-assembly and confinement effect of RTILs inside an integrated hybrid system, which have not beenclearly explained to date, were analyzed by 2D infrared correlation spectroscopy (2D IR COS); dynamicbehaviors of RTILs, i.e., sequentially spatial reorientation and kinetically conformational changes, wereattributed to the interactions between RTILs and aluminum hydroxides. 2D IR COS offers a new way tointerpret highly complex, veiled systems such as the formation mechanism of nanoparticles, biomineralization, self/supramolecular assembly, and nanoconfinement.