A5025580512- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Air Quality and Health Impacts
- Catalytic Cross-Coupling Reactions
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Catalytic C–H Functionalization Methods
- Organometallic Complex Synthesis and Catalysis
- Asymmetric Hydrogenation and Catalysis
- Air Quality Monitoring and Forecasting
- Carbon dioxide utilization in catalysis
- CO2 Reduction Techniques and Catalysts
- Atmospheric aerosols and clouds
- Family and Patient Care in Intensive Care Units
- Water Systems and Optimization
- Indoor Air Quality and Microbial Exposure
- Ionic liquids properties and applications
- Engineering Diagnostics and Reliability
- Mathematical Control Systems and Analysis
- Synthesis and Catalytic Reactions
- Sulfur-Based Synthesis Techniques
University of California, Davis
2021-2024
Mississippi State University
2017-2024
Consumer Healthcare Products Association
1991-1993
Abstract. The reaction of α-pinene with NO3 is an important sink both and at night in regions mixed biogenic anthropogenic emissions; however, there debate on its importance for secondary organic aerosol (SOA) reactive nitrogen budgets the atmosphere. Previous experimental studies have generally observed low or zero SOA formation, often due to excessive [NO3] conditions. Here, we characterize formation from + as a function nitrooxy peroxy (nRO2) radical fates HO2, NO, NO3, RO2 atmospheric...
CCC-NHC pincer Ni complexes electrocatalytically reduce CO<sub>2</sub> to CO and formate at the first reduction potential without producing or requiring molecular H<sub>2</sub>.
Atmospheric formic acid (FA) and acetic (AA) mixing ratios are often underestimated in atmospheric models, particularly over areas with high biogenic influence. We investigated the aqueous hydroxyl radical (OH) oxidation of 2-methyltetrol, one largest components secondary organic aerosols (SOAs) that produced from isoprene, compare its chemistry to non-methylated C4 polyol analogue, erythritol. studied kinetics reaction products 2-methyltetrol (2-MT) + OH erythritol (E) reactions using 1H...
Copper N-heterocyclic carbenes (NHCs) are an emerging area of focus for catalysis and other applications. Using a straightforward methodology, new highly modifiable tetradentate copper(II) NHC complex was generated characterized using X-ray crystallography, UV–vis EPR spectroscopy, cyclic voltammetry, ESI-MS. This adopted distorted 4-coordinate coordination mode demonstrates unique absorption spectrum species, but more interestingly, its redox properties indicate that it can readily access...
The sulfate anion radical (SO 4 •– ) is known to be formed in the autoxidation chain of sulfur dioxide and from minor reactions when or bisulfate ions are activated by OH radicals, NO 3 iron. Here, we report a source SO , irradiation liquid water sulfate-containing organic aerosol particles under natural sunlight laboratory UV radiation. Irradiation aqueous mixed with variety atmospherically relevant compounds degrades organics well within typical lifetime aerosols atmosphere. Products +...
Aqueous photochemistry of isoprene derivatives helps reconcile model budgets organic aerosol mass and gas-phase formic acetic acids.
Complexes of copper and 1,10‐phenanthroline have been utilized for organic transformations over the last 50 years. In many cases these systems are impacted by reaction conditions perform best under an inert atmosphere. Here we explore role ligand plays on electronic structure redox properties coordination complexes, what benefit related ligands may provide to enhance copper‐based coupling reactions. Copper(II) triflate complexes bearing (phen), ([Cu(phen) 2 (OTf)]OTf, 1 ) oxidized...
Monoligated and bis-ligated CCC-NHC pincer Fe complexes with n-butyl substituents have been synthesized by the Zr metalation/transmetalation route. Both direct transmetalation from isolated (BuCiCiCBu)ZrNMe2Cl2, 3, yielded octahedrally coordinated Fe(III) complex [(BuCiCiCBu)2Fe]Cl, 2a. Transmetalation in situ (BuCiCiCBu)ZrCl3, 5, presence of excess TMSCl 1 equiv source monoligated (BuCiCiCBu)FeCl2, 4. Conditions that convert [(BuCiCiCBu)2Fe]+, 2, to 4, found. Characterization included 1H...
The sulfate anion radical (SO4•-) is a reactive oxidant formed in the autoxidation chain of sulfur dioxide, among other sources. Recently, new formation pathways toward SO4•- and species have been reported. This work investigated second-order rate coefficients for aqueous oxidation following important organic aerosol compounds (kSO4): 2-methyltetrol, 2-methyl-1,2,3-trihydroxy-4-sulfate, 2-methyl-1,2-dihydroxy-3-sulfate, 1,2-dihydroxyisoprene, 2-methyl-2,3-dihydroxy-1,4-dinitrate,...
The hydroxyl radical (OH) oxidation of the most abundant nonmethane volatile organic compound emitted to atmosphere, isoprene (C5H8), produces a number chemical species that partition condensed phase via gas-particle partitioning or form condensed-phase compounds multiphase/heterogeneous chemistry generate secondary aerosols (SOA). SOA in aerosol water cloud/fog droplets may oxidize further aqueous reaction with OH radicals, among other fates. Rate coefficients for isoprene's photochemical...
1,2-Dihydroxy isoprene (1,2-DHI), a product of oxidation from multiple chemical pathways, is produced in the atmosphere large quantities; however, its fate has not been comprehensively studied. Here, we perform chamber experiments to investigate gas-phase reactions. We find that reactions 1,2-DHI with OH radicals and ozone are rapid (kOH = 8.0 (±1.3) × 10–11 cm3 molecule–1 s–1; kO3 7.2 (±1.1) 10–18 s–1). Reaction OH, which dominates loss, leads primarily fragmentation radical recycling;...
A water-soluble, manganese-porphyrin complex was used to catalytically generate aziridines from olefins in moderate good yields (up 93%) upon optimization at room temperature and aqueous media. Reactions using chloramine-T slightly acidic neutral pH values showed generally higher catalytic yields. Attempts integrate this system into a DNA hybrid catalyst support asymmetric aziridination little promise, where steric bulk the axial positions activation of by Mn-heme may influence its ability...
Abstract. The reaction of α-pinene with NO3 is an important sink both and at night in regions mixed biogenic anthropogenic emissions; however, there debate on its importance for secondary organic aerosol (SOA) reactive nitrogen budgets the atmosphere. Previous experimental studies have generally observed low or zero SOA formation, often due to excessive [NO3] conditions. Here, we characterize formation from + as a function nitrooxy peroxy (nRO2) radical fates HO2, NO, NO3, RO2 atmospheric...
Correction for ‘Emerging investigator series: aqueous oxidation of isoprene-derived organic aerosol species as a source atmospheric formic and acetic acids’ by Kelvin H. Bates et al. , Environ. Sci.: Atmos. 2023, 3 1651–1664, https://doi.org/10.1039/D3EA00076A.