Unraveling Confined Dynamics of Guests Trapped in Self-Assembled Pd6L4 Nanocages by Ultrafast Mid-IR Polarization-Dependent Spectroscopy
Unraveling Confined Dynamics of Guests Trapped in Self-Assembled Pd6L4 Nanocages by Ultrafast Mid-IR Polarization-Dependent Spectroscopy
复制标题
DOI：
10.1021/acs.jpclett.8b03485
复制
发表时间：
2019-02-07
影响因子：
5.7
通讯作者：
Anna, Jessica M.
中科院分区：
文献类型：
--
作者：
Gera, Rahul;Meloni, Stephen L.;Anna, Jessica M.
自组装的配位笼通过弱的非共价相互作用形成主客体络合物。了解这些弱相互作用如何影响客体分子的结构、反应性和动力学，对于进一步深化当前系统的设计原则并优化其特定功能非常重要。我们利用超快的中红外偏振相关泵浦探测光谱研究了两个Pd6L4自组装纳米笼对流动的第VIII族金属羰基客体分子的性质和动力学的影响。我们发现，Pd6L4纳米笼与客体分子之间的相互作用改变了客体的超快动力学，限制了旋转扩散运动，缩短了振动寿命。
Self-assembled coordination cages form host guest complexes through weak noncovalent interactions. Knowledge of how these weak interactions affect the structure, reactivity, and dynamics of guest molecules is important to further the design principles of current systems and optimize their specific functions. We apply ultrafast mid-IR polarization-dependent pump probe spectroscopy to probe the effects of two Pd6L4 self-assembled nanocages on the properties and dynamics of fluxional group-VIII metal carbonyl guest molecules. We find that the interactions between the Pd6L4 nanocages and guest molecules act to alter the ultrafast dynamics of the guests, restricting rotational diffusional motion and decreasing the vibrational lifetime.