A5054148884- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Metal-Organic Frameworks: Synthesis and Applications
- Crystallography and molecular interactions
- Covalent Organic Framework Applications
- Magnetism in coordination complexes
- Carbon Dioxide Capture Technologies
- Supramolecular Self-Assembly in Materials
- Nanoplatforms for cancer theranostics
- Molecular spectroscopy and chirality
- Advanced NMR Techniques and Applications
- Chemical Synthesis and Analysis
- Synthesis and Properties of Aromatic Compounds
- Carbon dioxide utilization in catalysis
- Polydiacetylene-based materials and applications
- Lanthanide and Transition Metal Complexes
- Molecular Sensors and Ion Detection
- Enhanced Oil Recovery Techniques
- Boron and Carbon Nanomaterials Research
- Mesoporous Materials and Catalysis
- Sulfur Compounds in Biology
- Layered Double Hydroxides Synthesis and Applications
- Dendrimers and Hyperbranched Polymers
- Plant Surface Properties and Treatments
- Membrane Separation and Gas Transport
Northwestern University
2021-2024
University of California, Berkeley
2015-2023
Robert H. Lurie Comprehensive Cancer Center of Northwestern University
2021
Lawrence Berkeley National Laboratory
2019-2020
Berkeley College
2017-2020
University of California, Los Angeles
2020
University of California System
2017-2020
City University of New York
2012
City College of New York
2012
The Graduate Center, CUNY
2012
The drug olsalazine (H4olz) was employed as a ligand to synthesize new series of mesoporous metal–organic frameworks that are expanded analogues the well-known M2(dobdc) materials (dobdc4– = 2,5-dioxido-1,4-benzenedicarboxylate; M-MOF-74). M2(olz) (M Mg, Fe, Co, Ni, and Zn) exhibit high surface areas with large hexagonal pore apertures approximately 27 Å in diameter. Variable temperature H2 adsorption isotherms revealed strong at open metal sites, situ infrared spectroscopy experiments on...
Metal-organic frameworks are of interest for use in a variety electrochemical and electronic applications, although detailed understanding their charge transport behavior, which is critical importance enhancing conductivities, remains limited. Herein, we report isolation the mixed-valence framework materials, Fe(tri)2(BF4) x (tri- = 1,2,3-triazolate; 0.09, 0.22, 0.33), obtained from stoichiometric chemical oxidation poorly conductive iron(II) Fe(tri)2, find that conductivity increases...
Metal–organic frameworks are among the most promising materials for industrial gas separations, including removal of carbon dioxide from natural gas, although substantial improvements in adsorption selectivity still sought. Herein, we use equilibrium experiments to demonstrate that flexible metal–organic framework Co(bdp) (bdp2– = 1,4-benzenedipyrazolate) exhibits a large CO2 capacity and approaches complete exclusion CH4 under 50:50 mixtures two gases, leading outstanding CO2/CH4 these...
Metal–organic frameworks are a new class of heterogeneous catalysts in which molecular-level control over both the immediate and long-range chemical environment surrounding catalytic center can be readily achieved. Here, oxidation cyclohexane to cyclohexanol cyclohexanone is used as model reaction investigate effect hydrophobic pore on product selectivity catalyst stability series iron-based frameworks. Specifically, expanded analogues Fe2(dobdc) (dobdc4– =...
Metal-organic frameworks that flex to undergo structural phase changes upon gas adsorption are promising materials for storage and separations, achieving synthetic control over the pressure at which these occur is crucial design of such specific applications. To this end, a new family based on flexible metal-organic framework Co(bdp) (bdp2- = 1,4-benzenedipyrazolate) has been prepared via introduction fluorine, deuterium, methyl functional groups bdp2- ligand, namely, Co(F-bdp),...
The widespread deployment of carbon capture and sequestration as a climate change mitigation strategy could be facilitated by the development more energy-efficient adsorbents. Diamine-appended metal–organic frameworks type diamine–M2(dobpdc) (M = Mg, Mn, Fe, Co, Ni, Zn; dobpdc4– 4,4′-dioxidobiphenyl-3,3′-dicarboxylate) have shown promise for carbon-capture applications, although questions remain regarding molecular mechanisms CO2 uptake in these materials. Here we leverage crystallinity...
Chiral metal–organic frameworks have attracted interest for enantioselective separations and catalysis because of their high crystallinity pores with tunable shapes, sizes, chemical environments. the type M2(dobpdc) (M = Mg, Mn, Fe, Co, Ni, Zn; dobpdc4– 4,4′-dioxidobiphenyl-3,3′-dicarboxylate) seem particularly promising potential applications excellent stability, internal surface areas, strongly polarizing open metal coordination sites within channels, but to date these materials been...
The development of new chemiresistive materials for use in chemical sensors that operate near ambient conditions could potentially reduce the costs implementation, encouraging their areas. Conductive metal–organic frameworks represent one intriguing class further investigation this area, given vast structural diversity and specificity adsorbate interactions afforded by crystallinity. Here, we re-examine electronic conductivity desolvated acetonitrile-solvated microporous framework...
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 crystal packing of organic chromophores has a profound impact on their photophysical properties. Molecular engineering is generally incapable producing precisely spaced arrays molecules for use in photovoltaics, light-emitting diodes, and sensors. A promising alternative strategy the incorporation into crystalline metal–organic frameworks (MOFs), leading to matrix coordination-induced emission (MCIE) upon confinement. However, it remains unclear how precise arrangement defects dictates...
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...
A major challenge to the implementation of artificial photosynthesis (AP), in which fuels are produced from abundant materials (water and carbon dioxide) an electrochemical cell through action sunlight, is discovery active, inexpensive, safe, stable catalysts for oxygen evolution reaction (OER). Multimetallic molecular catalysts, inspired by natural photosynthetic enzyme, can provide important guidance catalyst design, but necessary mechanistic understanding has been elusive. In particular,...
Abstract The design of stable adsorbents capable selectively capturing dioxygen with a high reversible capacity is crucial goal in functional materials development. Drawing inspiration from biological O 2 carriers, we demonstrate that coupling metal-based electron transfer secondary coordination sphere effects the metal–organic framework Co (OH) (bbta) (H bbta = 1 H ,5 -benzo(1,2- d: 4,5- d ′)bistriazole) leads to strong and adsorption . In particular, moderate-strength hydrogen bonding...
Herein, a synthetic polymer proteomimetic is described that reconstitutes the key structural elements and function of mussel adhesive protein. The was prepared via graft-through ring-opening metathesis polymerization norbornenyl-peptide monomer. peptide derived from natural underwater glue produced by marine mussels composed highly repetitive 10 amino acid tandem repeat sequence. hypothesis recapitulation repeating unit in this manner would provide facile route to nature-inspired adhesive....
Diamine-appended Mg2(dobpdc) (dobpdc4– = 4,4′-dioxidobiphenyl-3,3′-dicarboxylate) metal–organic frameworks have emerged as promising candidates for carbon capture owing to their exceptional CO2 selectivities, high separation capacities, and step-shaped adsorption profiles, which arise from a unique cooperative mechanism resulting in the formation of ammonium carbamate chains. Materials appended with primary,secondary-diamines featuring bulky substituents, particular, exhibit excellent...
Most C4 hydrocarbons are obtained as byproducts of ethylene production or oil refining, and complex energy-intensive separation schemes required for their isolation. Substantial industrial academic effort has been expended to develop more cost-effective adsorbent- membrane-based approaches purify commodity chemicals such 1,3-butadiene, isobutene, 1-butene, but the very similar physical properties these make this a challenging task. Here, we examine adsorption behavior cis-2-butene,...
Metal-peptide frameworks (MPFs) are a growing class of metal–organic with promising applications in metalloprotein mim-icry, chiral separations, and catalysis. There limited examples MPFs, especially those both secondary structure natural ami-no acid side chains that coordinate to metal nodes, which is important for accurately mimicking active sites. Here, we de-sign robust modular strategy based on short ɑ-helical peptides (9 amino acids long) form many types bio-mimetic Peptides were...
The burgeoning field of targeted protein degradation (TPD) has opened new avenues for modulating the activity previously undruggable proteins interest. To date, TPD been dominated by small molecules containing separate linked domains engagement and recruitment cellular machinery. process identifying active compounds required tedious optimization successful largely against a limited set targets with well-defined, suitable docking pockets. Here we present polymer chemistry approach termed...
Metal-peptide frameworks (MPFs) are a growing class of metal–organic with promising applications in metalloprotein mimicry, chiral separations, and catalysis. There limited examples MPFs, especially those both secondary structure natural amino acid side chains that coordinate to metal nodes, which is important for accurately mimicking active sites. Here, we de-sign robust modular strategy based on short ɑ-helical peptides (9 acids long) form many types bio-mimetic Peptides were designed have...
The metal–organic frameworks Zr<sub>6</sub>O<sub>4</sub>(OH)<sub>4</sub>(bpydc)<sub>6</sub> (<bold>1</bold>; bpydc<sup>2−</sup> = 2,2′-bipyridine-5,5′-dicarboxylate) and Zr<sub>6</sub>O<sub>4</sub>(OH)<sub>4</sub>(bpydc)<sub>0.84</sub>(bpdc)<sub>5.16</sub> (<bold>2</bold>; bpdc<sup>2−</sup> biphenyl-4,4′-dicarboxylate) were readily metalated with Ni(DME)Br<sub>2</sub> (DME dimethoxyethane) to produce the corresponding <bold>1</bold>(NiBr<sub>2</sub>)<sub>6</sub>...
Magnesium borohydride (Mg(BH4)2, abbreviated here MBH) has received tremendous attention as a promising onboard hydrogen storage medium due to its excellent gravimetric and volumetric capacities. While the polymorphs of MBH-alpha (α), beta (β), gamma (γ)-have distinct properties, their synthetic homogeneity can be difficult control, mainly structural complexity similar thermodynamic properties. Here, we describe an effective approach for obtaining pure polymorphic phases MBH nanomaterials...