A5039677952- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Metal-Organic Frameworks: Synthesis and Applications
- Magnetism in coordination complexes
- Nanoplatforms for cancer theranostics
- Advanced Condensed Matter Physics
- Rare-earth and actinide compounds
- Nanocluster Synthesis and Applications
- Magnetic and transport properties of perovskites and related materials
- Crystallography and molecular interactions
- Inorganic Chemistry and Materials
- Boron and Carbon Nanomaterials Research
- Advanced Photocatalysis Techniques
- Iron-based superconductors research
- Semiconductor materials and devices
- Covalent Organic Framework Applications
- Advanced Nanomaterials in Catalysis
- Advanced battery technologies research
- Inorganic Fluorides and Related Compounds
- Molecular Junctions and Nanostructures
- Metal-Catalyzed Oxygenation Mechanisms
- Luminescence Properties of Advanced Materials
- Chemical and Physical Properties in Aqueous Solutions
- Quantum Dots Synthesis And Properties
- Material Properties and Applications
Harvard University Press
2024-2025
Harvard University
2023-2024
University of California, Berkeley
2018-2023
Columbia University
2014-2016
Two iron–semiquinoid framework materials, (H2NMe2)2Fe2(Cl2 dhbq)3 (1) and (H2NMe2)4Fe3(Cl2 dhbq)3(SO4)2 (Cl2 dhbqn– = deprotonated 2,5-dichloro-3,6-dihydroxybenzoquinone) (2-SO4), are shown to possess electrochemical capacities of up 195 mAh/g. Employing a variety spectroscopic methods, we demonstrate that these exceptional arise from combination metal- ligand-centered redox processes, result supported by electronic structure calculations. Importantly, similar not observed in isostructural...
In nature, nonheme iron enzymes use dioxygen to generate high-spin iron(IV)=O species for a variety of oxygenation reactions. Although synthetic chemists have long sought mimic this reactivity, the enzyme-like activation O2 form iron(IV) = O remains an unrealized goal. Here, we report metal-organic framework featuring iron(II) sites with local structure similar that in α-ketoglutarate-dependent dioxygenases. The reacts at low temperatures are characterized using situ diffuse reflectance...
The layered square-planar nickelates, Nd$_{n+1}$Ni$_{n}$O$_{2n+2}$, are an appealing system to tune the electronic properties of nickelates via dimensionality; indeed, superconductivity was recently observed in Nd$_{6}$Ni$_{5}$O$_{12}$ thin films. Here, we investigate role epitaxial strain competing requirements for synthesis $n=3$ Ruddlesden-Popper compound, Nd$_{4}$Ni$_{3}$O$_{10}$, and subsequent reduction phase, Nd$_{4}$Ni$_{3}$O$_{8}$. We synthesize our highest quality...
Metal-organic frameworks that display step-shaped adsorption profiles arising from discrete pressure-induced phase changes are promising materials for applications in both high-capacity gas storage and energy-efficient separations. The thorough investigation of such through chemical diversification, measurements, situ structural characterization is therefore crucial broadening their utility. We examine a series isoreticular, flexible zeolitic imidazolate (ZIFs) the type M(bim)2 (SOD; M = Zn...
Here, we quantify the effect of an external magnetic field (β) on oxygen evolution reaction (OER) for a cobalt oxide|fluorine-doped tin oxide coated glass (CoOx|FTO) anode. A bespoke apparatus enables us to precisely determine relationship between flux density and OER activity at surface CoOx|FTO The includes strong NdFeB magnet (βmax = 450 ± 1 mT) capable producing 371 mT distance anode is controlled by linear actuator, enabling submillimeter positioning relative surface. We couple this...
In order to realize significant benefits from the assembly of solid-state materials molecular cluster superatomic building blocks, several criteria must be met. Reproducible syntheses reliably produce macroscopic amounts pure material; cluster-assembled solids show properties that are more than simply averages those constituent subunits; and rational changes chemical structures subunits result in predictable collective solid. this report we can meet these requirements. Using a combination...
Hierarchical solids created from the binary assembly of cobalt chalcogenide and iron oxide molecular clusters are reported. Six different based on octahedral Co6E8 (E = Se or Te) expanded cubane Fe8O4 units used as superatomic building blocks to construct these crystals. The formation solid is driven by transfer charge between complementary electron-donating electron-accepting in solution that crystallize ionic compounds. hierarchical structures investigated single-crystal X-ray diffraction,...
Single-molecule conductance measurements have focused primarily on organic molecular systems. Here, we carry out scanning tunneling microscope-based break-junction a series of metal chalcogenide Co6Se8 clusters capped with conducting ligands varying lengths. We compare these those individual free and find that the different decay constants increasing ligand length. also show, through in two solvents, 1-bromonaphthalene 1,2,4-trichlorobenzene, depends solvent environment. discuss several...
Nitric oxide (NO) shows differences in adsorption and reactivity two related cobalt( ii )–triazolate frameworks, demonstrating how the primary secondary coordination sphere of metal centers adsorbents can be designed for targeted delivery.
Here, we report the development of a hydrogen-free, topotactic oxygen deintercalation technique using alkali metal aluminum gallium amalgams (AxAlGa, where A = Li, Na, K). These provide uniquely tunable system choice metal, its concentration, and Al:Ga composition alter reductive properties. We demonstrate utility this method in topotactically removing from bulk thin film specimens LnNiO3 (Ln La, Nd) to form infinite layer nickelate LnNiO2 Nd). For example, Na0.25AlGa affords LaNiO2 LaNiO3...
Fluoride-ion batteries have several potential advantages over lithium-ion batteries. Materials development is still needed, however, to realize electrolytes with sufficiently high anion conductivity and compatibility anode cathode layers. Fluoride compounds are difficult synthesize directly as single crystals but can be realized from oxide film precursors via topotactic chemistry techniques. Here, we create crystalline alkaline earth bismuth fluoride films BaBiF
Indium tin oxide (Sn-doped In2O3; ITO) is a well-studied transparent conductor where doping can be used to stabilize superconducting state. In this work, we use combination of thin film deposition ITO and solution-phase chemistry using n-BuLi (C4H9Li) realize superconductivity in Li-doped ITO. Solution-phase intercalation commonly employed for bulk, polycrystalline materials but has rarely been applied films. Using x-ray diffraction, atomic force microscopy, electronic transport, optical...
<p>Metal–organic frameworks that display step-shaped adsorption profiles arising from discrete pressure-induced phase changes are promising materials for applications in both high-capacity gas storage and energy-efficient separations. The thorough investigation of such through chemical diversification, measurements, <i>in situ </i>structural characterization is therefore crucial broadening their utility. We examine a series isoreticular, flexible zeolitic imidazolate (ZIFs)...
The layered square-planar nickelates, Nd$_{n+1}$Ni$_{n}$O$_{2n+2}$, are an appealing system to tune the electronic properties of nickelates via dimensionality; indeed, superconductivity was recently observed in Nd$_{6}$Ni$_{5}$O$_{12}$ thin films. Here, we investigate role epitaxial strain competing requirements for synthesis $n=3$ Ruddlesden-Popper compound, Nd$_{4}$Ni$_{3}$O$_{10}$, and subsequent reduction phase, Nd$_{4}$Ni$_{3}$O$_{8}$. We synthesize our highest quality...