A5030939787- Membrane Separation and Gas Transport
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Membrane Separation Technologies
- Membrane-based Ion Separation Techniques
- Luminescence and Fluorescent Materials
- Porphyrin and Phthalocyanine Chemistry
- Covalent Organic Framework Applications
- Molecular Sensors and Ion Detection
- Metal-Organic Frameworks: Synthesis and Applications
- Magnetism in coordination complexes
- Muon and positron interactions and applications
- Inorganic Chemistry and Materials
- CO2 Reduction Techniques and Catalysts
- Supercapacitor Materials and Fabrication
- Organometallic Complex Synthesis and Catalysis
- Advanced biosensing and bioanalysis techniques
- Catalytic Processes in Materials Science
- Crystallography and molecular interactions
- Gas Sensing Nanomaterials and Sensors
- Nanomaterials for catalytic reactions
- Inorganic Fluorides and Related Compounds
- Extraction and Separation Processes
Harvard University
2019-2024
Massachusetts Institute of Technology
2020-2024
University of Delaware
2013-2019
Two new 2,2'-bipyridine (bpy) derivatives containing ancillary BODIPY chromophores attached at the 5- and 5'-positions (BB3) or 6- 6'-positions (BB4) were prepared characterized. In this work, basic photophysics, electrochemistry, electrogenerated chemiluminescence (ECL) of BB3 BB4 are compared with those previously reported for a related bpy-BODIPY derivative (BB2) (J. Phys. Chem. C 2011, 115, 17993-18001). Cyclic voltammetry revealed that display reversible 2e(-) oxidation reduction waves,...
Abstract Gas‐separation polymer membranes display a characteristic permeability–selectivity trade‐off that has limited their industrial use. The most comprehensive approach to improving performance is devise strategies simultaneously increase fractional free volume, narrow volume distribution, and enhance sorption selectivity, but generalizable methods for such approaches are exceedingly rare. Here, we present an in situ crosslinking solid‐state deprotection method access previously...
Composite membranes featuring metal-organic framework (MOF)-dispersed polymers have attracted tremendous attention in recent years. However, evaluating commercial viability is oftentimes obscured by the irreproducibility both MOF synthesis and film manufacturing protocols. Variability property sets are typically ascribed to crystal defects resulting from subtle variations synthesis, but quantitative studies investigating role of on transport properties exceedingly rare. Likewise, controlled...
Polyamide thin-film nanocomposite (TFN) membranes provide a promising pathway to alleviate the trade-off between water permeability and selectivity of conventional composite (TFC) membranes. However, fabrication defect-free TFN with enhanced permselectivity remains challenge due formation defects at polyamide–filler interface from filler agglomeration. In this study, facile interfacial modification strategy was demonstrated effectively mitigate particle agglomeration enhance interaction...
Poor interfacial compatibility remains a pressing challenge in the fabrication of high-performance polymer-MOF composites. In response, introducing compatible chemistries such as carboxylic acid moiety has emerged compelling strategy to increase interactions. this work, we leveraged functionalities UiO-66-NH2 and acid-functionalized PIM-1 fabricate mixed-matrix membranes (MMMs) with improved separation performance compared PIM-1-based MMMs industrially relevant conditions. Under pure-gas...
Two new Re(I)bipyridyltricarbonyl chloride complexes, Re(BB3)(CO)3Cl and Re(BB4)(CO)3Cl, featuring BODIPY groups appended to the 5,5'- or 6,6'-positions of bipyridine ligand, respectively, were synthesized as structurally isomeric compliments a previously reported 4,4'-substituted homologue, Re(BB2)(CO)3Cl. X-ray crystal structures compounds show that 4,4'-, 5,5'-, 6,6'-substitution patterns place at progressively shorter distances 9.43, 8.39, 5.56 Å, from complexes' Re centers. The...
In this report we examine a family of trinuclear iron complexes by multiple-wavelength, anomalous diffraction (MAD) to explore the redox load distribution within cluster materials free refinement atomic scattering factors. Several effects were explored that can impact factors clusters, including 1) metal atom primary coordination sphere, 2) M−M bonding, and 3) delocalization in formally mixed-valent species. Complexes investigated which vary from highly symmetric fully asymmetric 57 Fe...
Anomalous X-ray diffraction (AXD) and neutron can be used to crystallographically distinguish between metals of similar electron density. Despite the use AXD for structural characterization in mixed metal clusters, there are no benchmark studies evaluating accuracy toward assessing elemental occupancy molecules with comparisons what is determined via diffraction. We collected resonant data on several homo heterometallic clusters refined their anomalous scattering components determine site...
Abstract Gas‐separation polymer membranes display a characteristic permeability–selectivity trade‐off that has limited their industrial use. The most comprehensive approach to improving performance is devise strategies simultaneously increase fractional free volume, narrow volume distribution, and enhance sorption selectivity, but generalizable methods for such approaches are exceedingly rare. Here, we present an in situ crosslinking solid‐state deprotection method access previously...
Mixed-matrix membranes (MMMs) formed from dispersed metal–organic framework (MOF) particles in polymers have attracted great attention recent years. One of the key remaining challenges that needs to be addressed is improving interfacial compatibility between MOF and polymer phases. In this study, we extended a covalent priming approach attach polyimide oligomers surface ZIF-90 MOF, after which, core-shell can added various polyimides form MMMs with compatible interfaces, resulting...
Efficient discrimination of ions and small neutral contaminants remains a challenge for polyamide thin-film nanocomposite (TFN) water separation membranes due to the presence interfacial defects particle-agglomeration-induced nonselective voids in thin layer. In this work, postsynthetic modification (3-glycidyloxypropyl)triethoxysilane on MIL-101(Cr)-NH 2 MOF filler nanoparticles was performed form stable particle suspension organic monomer solution during polymerization membrane formation,...