A5018242518- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Polyoxometalates: Synthesis and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Vanadium and Halogenation Chemistry
- Lanthanide and Transition Metal Complexes
- Radioactive element chemistry and processing
- Oxidative Organic Chemistry Reactions
- Catalysis and Oxidation Reactions
- Organometallic Complex Synthesis and Catalysis
- Metalloenzymes and iron-sulfur proteins
- Coordination Chemistry and Organometallics
- CO2 Reduction Techniques and Catalysts
- Advanced Fiber Optic Sensors
- Advanced Nanomaterials in Catalysis
- Transition Metal Oxide Nanomaterials
- Electrocatalysts for Energy Conversion
- Ultrasonics and Acoustic Wave Propagation
- Non-Destructive Testing Techniques
- Chemical Synthesis and Reactions
Lawrence Berkeley National Laboratory
2025
University of Rochester
2018-2024
Los Alamos National Laboratory
2004-2024
Hood College
2017
Numerous technologies—with catalytic, therapeutic, and diagnostic applications—would benefit from improved chelation strategies for heavy alkaline earth elements: Ra 2+ , Ba Sr . Unfortunately, chelating these metals is challenging because of their large size weak polarizing power. We found 18-crown-6-tetracarboxylic acid ( H 4 COCO ) bound to form M(H x COCO) –2 Upon isolating radioactive 223 its parent radionuclides 227 Ac Th), reacted with the fully deprotonated 4− chelator generate...
Understanding the chemistry of inert actinide oxo bond in actinyl ions AnO22+ is important for controlling behavior environment, during separations, and nuclear waste (An = U, Np, Pu). The thioether calixarene TC4A (4‐tert‐butyltetrathiacalix[4]arene) binds equatorially to [AnO2]n+ Np) forming a conical pocket that differentiates two trans‐oxo groups. ‘ate’ complexes, [A]2[UO2(TC4A)] (A [Li(DME)2], HNEt3) [HNEt3]2[NpO2(TC4A)], enable selective chemistry. Silylation UVI groups by...
Understanding the chemistry of inert actinide oxo bond in actinyl ions AnO22+ is important for controlling behavior environment, during separations, and nuclear waste (An = U, Np, Pu). The thioether calixarene TC4A (4‐tert‐butyltetrathiacalix[4]arene) binds equatorially to [AnO2]n+ Np) forming a conical pocket that differentiates two trans‐oxo groups. ‘ate’ complexes, [A]2[UO2(TC4A)] (A [Li(DME)2], HNEt3) [HNEt3]2[NpO2(TC4A)], enable selective chemistry. Silylation UVI groups by...
We report the synthesis and characterization of a monochloride-functionalized polyoxovanadate-alkoxide (POV-alkoxide) cluster, which can serve as molecular model for halogen-doped vanadium oxide (VO2) materials that have recently attracted great interest advanced energy-saving smart window applications. Chloride-substituted variants Lindqvist vanadium-oxide cluster were obtained via two distinct chemical pathways: (1) direct halogenation isovalent parent POV-alkoxide architecture,...
We report a rare example of oxygen atom transfer (OAT) from polyoxometalate cluster to series tertiary phosphanes. Addition PR3 (PR3 = PMe3, PMe2Ph, PMePh2, PPh3) neutral methoxide-bridged polyoxovanadate-alkoxide (POV-alkoxide) cluster, [V6O7(OMe)12]0, results in isolation reduced structure with phosphine oxide datively coordinated site-differentiated VIII ion. A positive correlation between the steric and electronic properties phosphane reaction rate was observed. Further investigation...
Cooperative multimetallic electron transfer to accommodate substrate binding.
The rational control of the electrochemical properties polyoxovanadate-alkoxide clusters is dependent on understanding influence various synthetic modifications overall redox processes these systems. In this work, electronic consequences ligand substitution at heteroion in a heterometal-functionalized cluster was examined. [V
We report the synthesis of a cyclic hexavanadate polyoxovanadate-alkoxide cluster, <bold>[VO(OC2H5)2]6</bold>, and its conversion, under solvothermal conditions, to an oxygen-deficient Lindqvist assembly, [V<sub>6</sub>O<sub>6</sub>(OC<sub>2</sub>H<sub>5</sub>)<sub>12</sub>]<sup>n</sup> (<italic>n</italic> = 1−, 0).
The isolation of the oxygen-deficient, polyoxovanadate-alkoxide (POV-alkoxide) cluster, [nBu4N][V6O6(OMe)12(MeCN)], and its subsequent reactivity with oxygen (O2), has demonstrated utility these assemblies as molecular models for heterogeneous metal oxide catalysts. However, mechanism through which this cluster activates reduces O2 to generate oxygenated species is poorly understood. Currently it speculated that POV-alkoxide mediates four-electron O–O bond cleavage an bridged dimeric...
We report accelerated rates of oxygen-atom transfer from a polyoxovanadate-alkoxide cluster following functionalization with 4-tertbutylcalix[4]arene ligand. Incorporation this electron withdrawing ligand modifies the electronics metal oxide core, favoring mechanism in which rate is limited by outer-sphere transfer.
Abstract A number of technologies would benefit from developing inorganic compounds and materials with specific electronic magnetic exchange properties. Unfortunately, designing these properties is difficult because metal⋅⋅⋅metal coupling schemes are hard to predict control. Fully characterizing communication between metals in existing that exhibit interesting could provide valuable insight advance those predictive capabilities. One such class molecules the series Lindqvist...