A5066017597- Porphyrin and Phthalocyanine Chemistry
- Synthesis and Properties of Aromatic Compounds
- Magneto-Optical Properties and Applications
- Nonlinear Dynamics and Pattern Formation
- Luminescence and Fluorescent Materials
- Molecular spectroscopy and chirality
- Fluorine in Organic Chemistry
- Advanced NMR Techniques and Applications
- Electron Spin Resonance Studies
- Catalytic C–H Functionalization Methods
- Covalent Organic Framework Applications
- Synthetic Organic Chemistry Methods
- Liquid Crystal Research Advancements
- Solid-state spectroscopy and crystallography
- Fullerene Chemistry and Applications
- Cyclopropane Reaction Mechanisms
- Chemical synthesis and alkaloids
- Spectroscopy and Quantum Chemical Studies
- Chemical Synthesis and Analysis
- Quantum optics and atomic interactions
- Magnetism in coordination complexes
- Organic Chemistry Cycloaddition Reactions
- Synthesis and Catalytic Reactions
- Supramolecular Chemistry and Complexes
- Molecular Sensors and Ion Detection
Massachusetts Institute of Technology
2020-2025
Institute for Soldier Nanotechnologies
2021-2023
Université Laval
2017
The connection between magnetic field induced optical activity and chirality has a rich complicated history. Although the broken inversion symmetry of chiral molecules generates ‘natural’ activity, is generated by breaking time reversal symmetry. As result, molecular not expected to influence phenomena, such as Faraday rotation. Here we show that supramolecular assembly polymers can result in large effect. This strong rotation, which amongst highest value known for organic materials,...
An efficient copper-catalyzed carbenoid insertion reaction of α-diazo carbonyl compounds into Si-H and S-H bonds was developed. A wide range α-silylesters α-thioesters obtained in high yields (up to 98%) from α-diazoesters using 5 mol% a simple copper(I) salt as catalyst. Using 0.05 the same catalyst, α-diazoketones led α-silylketones low good 70%).
The Overhauser effect (OE), commonly observed in NMR spectra of liquids and conducting solids, was recently discovered insulating solids doped with the radical 1,3-bisdiphenylene-2-phenylallyl (BDPA). However, mechanism polarization transfer OE-DNP insulators is yet to be established, but hyperfine coupling protons BDPA has been proposed. In this paper we present a study that addresses role couplings via EPR DNP measurements on some selectively deuterated radicals synthesized for purpose....
The magneto-optical phenomenon known as Faraday rotation involves the of plane-polarized light it passes through an optical medium in presence external magnetic field oriented parallel to direction propagation. rotators find applications isolators and magnetic-field imaging technologies. In recent years, organic thin films comprised polymeric small-molecule chromophores have demonstrated Verdet constants, which measure magnitude at a given strength material thickness, that exceed those found...
We recently used selective 2H labeling of BDPA to investigate the Overhauser Effect (OE) dynamic nuclear polarization (DNP) mechanism in insulating solids doped with 1,3-bis(diphenylene)-2-phenylallyl (BDPA), and established that α γ 1H spins on fluorene rings are responsible for generating a zero quantum (ZQ) mediated positive bulk polarization. Here, we establish phenyl relax via double-quantum (DQ) processes therefore contribute negative enhancements which attenuate OE-DNP. With...
Organic Faraday rotators have gained significant attention in recent years as a promising alternative to traditional inorganic magneto-optical (MO) materials result of their lower cost, superior mechanical properties, and potential for large-scale deployment. This interest is peaked by the fact that number high symmetry, rigid, strongly optically absorbing organic chromophores display Verdet constants an order magnitude higher than commercial rotators. Critical development new generations...
The Faraday effect is a magneto-optical (MO) phenomenon that causes the plane of linearly polarized light to rotate when passing through medium subjected parallel magnetic field. Informed by established quantum mechanical model developed Buckingham and Stephens, we sought identify molecules would exhibit large MO responses. Magnetic circular dichroism studies ferrocenium in 1970s revealed its potential as an material; however, it has not been evaluated context rotation thin-film optical...
Molecular thin films are currently being investigated as candidate materials to replace conventional atomistic inorganic crystal-based Faraday rotators. High symmetry paramagnetic species have been reported exhibit large Verdet constants via magnetic field splitting of degenerate ground states. However, lower open-shell not extensively studied. Herein, we report the rotation two poly di-tert-butylferroceniums with diphenylsilane and vinylene linkers. Thin oxidized...
Incorporating fluorine atoms into a molecule can endow it with various unique properties that enable materials applications. Selective solubility in fluorous solvents is achieved by high content and selective partitioning perfluorinated liquids over organic aqueous phases provides orthogonal opportunities for chemistry assembly. Although there growing number of partially fluorinated molecules, are insufficient structural design principles to produce diverse soluble dyes. Herein, we report...
Key words Suzuki–Miyaura cross-coupling - mechanochemistry solid-state chemistry
Key words macrocyclic molecules - oligofuran backbone p-type semiconductors
Key words luminescent organic radicals - donor–acceptor molecular scaffolds Aufbau principle
Key words pH-responsive materials - cyclic polymers ring-expansion polymerization
Key words bis-benzofuran - enantioselectivity atropisomeric synthesis chiral oligoarenes
Key words quinoline synthesis - homologation diaza-Cope rearrangement
Key words tetraarylethylenes - Suzuki–Miyaura cross-coupling stereoselective synthesis
Key words mechanochemistry - nanographenes corannulene derivatives