Open AccessUnraveling Confined Dynamics of Guests Trapped in Self-Assembled Pd6L4 Nanocages by Ultrafast Mid-IR Polarization-Dependent Spectroscopy
Author(s) -
Rahul Gera,
Stephen L. Meloni,
Jessica M. Anna
Publication year - 2019
Publication title -
the journal of physical chemistry letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.563
H-Index - 203
ISSN - 1948-7185
DOI - 10.1021/acs.jpclett.8b03485
Subject(s) - nanocages , ultrashort pulse , molecule , chemical physics , spectroscopy , chemistry , polarization (electrochemistry) , rotational dynamics , self assembly , non covalent interactions , nanotechnology , computational chemistry , materials science , catalysis , physics , organic chemistry , hydrogen bond , laser , quantum mechanics , optics
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 Pd 6 L 4 self-assembled nanocages on the properties and dynamics of fluxional group-VIII metal carbonyl guest molecules. We find that the interactions between the Pd 6 L 4 nanocages and guest molecules act to alter the ultrafast dynamics of the guests, restricting rotational diffusional motion and decreasing the vibrational lifetime.