Tokyo Institute of Technology · Chemistry
Professor James M. Lisy's research lab specializes in gas-phase cluster spectroscopy, focusing on the structural, dynamic, and energetic properties of small ionic and molecular clusters. Using advanced techniques such as vibrational predissociation spectroscopy, tandem mass spectrometry, and tunable infrared lasers, the lab investigates solvation effects, hydrogen bonding networks, and ion-molecule interactions in finite systems. Their work provides critical insights into fundamental processes like ion selectivity, solvation shell formation, and structural transitions, often serving as a benchmark for theoretical models. The lab's pioneering studies on systems like (HF)n, Li⁺(H₂O)ₙ, and valinomycin-K⁺ complexes have significantly advanced the understanding of molecular recognition and transport at the molecular level.
Figures are computed from collected data and may differ slightly.
Vibrational pre-dissociation spectroscopy combined with mass spectrometry has been used to obtain the infrared spectra of mass-selected cluster ions. The onset of new spectroscopic features, as a function of solvent number, has been shown to correspond to specific structural changes such as the filling of solvent shells and the formation of hydrogen bonds. These small finite systems offer a number of advantages over traditional solution-based measurements and perhaps are the most useful way to t
Using molecular beam techniques and a tunable infraredlaser, the vibrational predissociation spectra for (HF)n, n = 2 to 6, in the 3000 to 4000 cm−1 range are presented. The vibrational bands have been assigned to intramolecular HF stretching modes and combinations of intra- and intermolecular modes. The structures of (HF)n, n = 3 to 6, were found to be cyclic, i.e., each HF molecule is both a proton donor and acceptor.
Beginning in the mid-1980s, a number of innovative experimental studies on ionic clusters emerged from the laboratory of Yuan T. Lee combining infrared laser spectroscopy and tandem mass spectrometry. Coupled with modern electronic structure calculations, this research explored many facets of ionic clusters including solvation, structure, and dynamics. These efforts spawned a resurgence in gas-phase cluster spectroscopy. This paper will focus on the major areas of research initiated by the Lee g
The internal energy or effective temperature of cluster ions has become an important issue in characterizing the structures observed in these species. This report considers the role played by the method of ion preparation (laser vaporization-supersonic expansion versus ion impact-evaporative cooling) in governing the internal energy of a specific species, Li(+)(H(2)O)Ar. Vibrational predissociation spectroscopy of the O-H stretch modes revealed rotational features, which were used to characteriz
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlatinum(II) complex containing a metallodithiocarboxylate ligandJames M. Lisy, Edward D. Dobrzynski, Robert J. Angelici, and Jon ClardyCite this: J. Am. Chem. Soc. 1975, 97, 3, 656–657Publication Date (Print):February 1, 1975Publication History Published online1 May 2002Published inissue 1 February 1975https://pubs.acs.org/doi/10.1021/ja00836a039https://doi.org/10.1021/ja00836a039research-articleACS PublicationsRequest reuse permissionsArticle Views83
Valinomycin is a macrocyclic ionophore that transports K<sup>+</sup> across hydrophobic membranes. Its function depends on selectivity, capture, transport, and release of the ion. While thermodynamics clearly indicate that valinomycin binds K<sup>+</sup> preferentially over all other alkali ions, characterizing the capture/transport/release of K<sup>+</sup> by valinomycin at the molecular level remains a challenge. The bracelet-like structure of valinomycin-K<sup>+</sup> (K<sup>+</sup>VM) has th
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