Search
Now showing items 1-10 of 123
Nonlinear terahertz spectroscopy of electronic and vibrational responses in condensed matter systems
(Massachusetts Institute of Technology, 2012)
In this work, I describe experiments utilizing high-field terahertz (THz) pulses to initiate nonlinear responses in several classes of materials. We have developed several methods for interrogating the nonlinear THz response ...
THz polaritonics : optical THz generation, detection, and control on a chip
(Massachusetts Institute of Technology, 2012)
The THz polaritonics system is an on-chip platform for THz generation, detection, and control. THz-frequency electromagnetic waves are generated directly in a thin slab of lithium niobate crystal where they can be amplified ...
Niobium-mediated synthesis of phosphorus-rich molecules
(Massachusetts Institute of Technology, 2010)
The use of a sterically demanding enolate ligand -OC[2Ad]Mes supported by niobium has allowed for the synthesis of (Mes[2Ad]CO) 3Nb=PP7Nb(OC [2Ad]Mes)3 through P4 coupling by a low-valent niobium intermediate. This asymmetric ...
Photoinduced phase transitions studied by femtosecond single-shot spectroscopy
(Massachusetts Institute of Technology, 2010)
Single-shot femtosecond spectroscopy has been developed and employed for the study of phase transitions of solid-state materials. Using two crossed echelons, a two dimensional spatial delay gradient was generated across a ...
Nickel-catalyzed preparation of acrylamides from alpha olefins and isocyanates ; Synthetic studies toward ripostatin A
(Massachusetts Institute of Technology, 2010)
Chapter I. In the presence of the N-heterocyclic carbene ligand IPr, the nickel(0)-catalyzed coupling reaction of a-olefins and branched aliphatic isocyanates provides c,-unsaturated amides arising from preferential C-C ...
Advances in non-heme diiron modeling chemistry : developing functional protein mimics through ligand design and understanding dioxygen activation
(Massachusetts Institute of Technology, 2011)
Chapter 1 A comprehensive review of diiron modeling in the Lippard group over the past thirty years is presented. This account describes the different strategies employed to prepare biomimetic complexes of non-heme diiron ...
Stereoselective monoalkyl diazene synthesis for mild reductive transformations : direct synthesis of densely substituted pyridines and pyrimidines
(Massachusetts Institute of Technology, 2011)
I. N-Isopropylidene-N'-2-Nitrobenzenesulfonyl Hydrazine. A Reagent for Reduction of Alcohols via the Corresponding Monoalkyl Diazenes The development of a new reagent N-isopropylidene-N'-2-nitrobenzenesulfonyl hydrazine ...
Syntheses and studies of group 6 terminal pnictides, early-metal trimetaphosphate complexes, and a new bis-enamide ligand
(Massachusetts Institute of Technology, 2011)
Investigated herein is the reactivity of the terminal-nitrido, trisanilide tungsten complex, NW(N[i- Pr]Ar)3 (Ar = 3,5-Me 2C6H3, 1). Nitride 1 has been shown to undergo an "N for (O)C1 metathesis with a variety of acid ...
Phosphorescent semiconductor nanocrystals and proteins for biological oxygen sensing
(Massachusetts Institute of Technology, 2011)
Oxygen is required for cellular respiration by all complex life making it a key metabolic profiling factor in biological systems. Tumors are defined by hypoxia (low pO2), which has been shown to influence response to ...
Synthesis and determination of the absolute configuration of Armatol A through a polyepoxide cyclization cascade : revision of the proposed structures of Armatols A-F
(Massachusetts Institute of Technology, 2011)
Cyclization Cascades Leading to the Tricyclic Fragment of Armatol A The synthesis of the fused 6,7,7-tricycle of armatol A was investigated. Fragments containing both a ketone and an aldehyde for subsequent fragment coupling ...