个人简介

Ph. D., Colorado State University

研究领域

Physical Inorganic Chemistry

The Rack research group is interested in the design and characterization of inorganic molecules with specific electronic structures for applications in energy storage, solar energy conversion and electron transfer. A major thrust of our group focuses on the preparation and examination of molecular photochromic and electrochromic compounds. Typically, our strategy employs molecules exhibiting Charge-Transfer (CT) photochemistry, an isomerizable ligand, and a metal atom capable of one electron redox chemistry. Ancillary ligands further modulate the spectroscopic properties of the complex. The mode of action in these complexes is an electron-transfer triggered linkage isomerization which results in a dramatic change in both the absorption spectrum and the reduction potential of these complexes. Typical characterization techniques in the group are electrochemistry, spectroelectrochemistry, UV-vis absorption, variable-temperature emission (steady-state and time resolved) and transient absorption spectroscopy as well as other instrumentation for routine analysis (NMR, IR, X-ray crystallography). While we are ultimately interested in device applications for these compounds, we are compelled to understand the mechanism of action in these and other photoactive molecules. As a result, many of the group members embrace an iterative synthesis and measurement approach in the design of target molecules

近期论文

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T. A. Grusenmeyer, A. W. King, J. T. Mague, J. J. Rack, R. H. Schmehl, “Sn(IV) Schiff Base Complexes: Triplet Photosensitizers for Photoredox Reactions” Dalton Transactions, 2014, DOI 10.139/c4dt01427h. Invited article to Special Issue: Spectroscopy of Inorganic Excited States K. Garg, A.W. King, J. J. Rack, “One Photon Yields Two Isomerizations: Towards Optimizing Excited State Distortions For Efficient Energy Conversion” Journal of the American Chemical Society, 2014, 136, 1856-1863. K. P. Castro, Y. Jin, J. J. Rack, S. H. Strauss, O. V. Boltalina, A. A. Popov, “Perfluoroalkylation of C70 Yields the Brightest Fullerene Fluorophores: Position of One CF3 Group Matters” Journal of Physical Chemistry Letters, 2013, 4, 2500-2507. K. Garg, J. T. Engle, C. J. Ziegler, J. J. Rack, “Ground and Excited State Isomerization Dynamics in Analogous Ruthenium and Osmium Sulfoxide Complexes” Chemistry A European Journal, 2013, 19, 11686-11695. Y. Jin, J. J. Rack, “Molecules in Motion: From Sub-Nanoscale to Macroscale” Israel Journal of Chemistry, 2013, 53, 280-287. Invited review for thematic issue, Functional Photochromics, organized by Devens Gust and Francisco Raymo A. W. King, Y. Jin, J. T. Engle, C. J. Ziegler, J. J. Rack, “Sequential Picosecond Isomerizations in a Photochromic Ruthenium Sulfoxide Complex Triggered by 2-Color Pump-Repump-Probe Spectroscopy” Inorganic Chemistry, 2013, 52, 2086-2093. K. Garg, S. I. M. Paris, J. J. Rack, “A Flexible Chelate Leads to Phototriggered isomerization in a Photochromic Osmium Sulfoxide Complex” European Journal of Inorganic Chemistry, 2013, 7, 1142-1148. T. Grusenmeyer, J. Chen, Y. Jin, J. Nguyen, J. J. Rack, R. Schmehl, “pH Control of Intramolecular Energy Transfer and Oxygen Quenching in Ru(II) Complexes Having Coupled Electronic Excited States” Journal of the American Chemical Society, 2012, 134, 7497-7506. Y. Jin, S. I. M. Paris, J. J. Rack, “Bending Materials with Light: Photoreversible Macroscopic Deformations in an Amorphous Polymer” Advanced Materials, 2011, 23, 4312-4317. B. A. McClure, J. J. Rack, “Ultrafast Spectroscopy of Photochromic Ruthenium Sulfoxide Complexes” Inorganic Chemistry, 2011, 50, 7586-7590. B. L. Porter, B. A. McClure, E. R. Abrams, J. T. Engle, C. J. Ziegler, J. J. Rack, “Isomerization in an Analogous Set of Ruthenium Sulfoxide Complexes” Journal Photochemistry and Photobiology A., 2011, 217, 341-346. V. Dieckman, K. Springfeld, S. Eicke, M. Imlau, and J. J. Rack, “Thermal Stability, photochromic sensitivity and optical properties of [Ru(bpy)2(OSOR)]+ compounds with R = Bn, BnCl, BnMe” Optics Express, 2010, 18, 23495-23503. D. A. Lutterman, A. A. Rachford, J. J. Rack and C. Turro, “Electronic and Steric Effects on the Photoisomerization of Dimethylsulfoxide Complexes of Ru(II) Containing Picolinate” The Journal of Physical Chemistry L, 2010, 1, 3371-3375. C. S. Keating, B. A. McClure, J. J. Rack, I. V. Rubtsov, “Mode Coupling Pattern Changes Drastically Upon Photoisomerization in RuII complex” The Journal of Physical Chemistry C, 2010, 117, 16740-16745. C. S. Keating, B. A. McClure, J. J. Rack, I. V. Rubtsov, “Sulfoxide Stretching Mode as a Structural Reporter via Dual-Frequency 2DIR Spectroscopy” Journal of Chemical Physics, 2010, 133, 144513 B. A. McClure, J. J. Rack, “Isomerization in Photochromic Ruthenium Sulfoxide Complexes” European Journal of Inorganic Chemistry, 2010, 3895-3904; invited microreview B. A. McClure, E. R. Abrams, J. J. Rack, “Excited State Distortion in Photochromic Ruthenium Sulfoxide Complexes” Journal of the American Chemical Society, 2010, 132, 5428-5436; featured on JACS website from April 14, 2010 to April 21, 2010. T. A. Grusenmeyer, B. A. McClure, C. J. Ziegler, J. J. Rack, “Solvent Effects on Isomerization in a Ruthenium Sulfoxide Complex,” Inorganic Chemistry, 2010, 49, 4466-4470.