- Metal-Organic Frameworks: Synthesis and Applications
- Supramolecular Self-Assembly in Materials
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Crystallography and molecular interactions
- Supramolecular Chemistry and Complexes
- Covalent Organic Framework Applications
- Magnetism in coordination complexes
- Luminescence and Fluorescent Materials
- Hydrogels: synthesis, properties, applications
- Carbon dioxide utilization in catalysis
- Molecular Sensors and Ion Detection
- Membrane Separation and Gas Transport
- Phase Equilibria and Thermodynamics
- Zeolite Catalysis and Synthesis
- Polyoxometalates: Synthesis and Applications
- Synthesis and Characterization of Heterocyclic Compounds
- Advanced Photocatalysis Techniques
- Polydiacetylene-based materials and applications
- Catalytic Processes in Materials Science
- Carbon Dioxide Capture Technologies
- Polymer composites and self-healing
- Nanoplatforms for cancer theranostics
- Nanocluster Synthesis and Applications
- MXene and MAX Phase Materials
TU Dortmund University
2018-2021
National Chemical Laboratory
1992-2018
Institute for Basic Science
2017
Government of the Republic of Korea
2017
Academy of Scientific and Innovative Research
2014
University of Hyderabad
2009
Cadmium sulfide (CdS) quantum dots (<10 nm in size) have been successfully synthesized situ without any capping agent a Zn(II)-based low-molecular-weight metallohydrogel (ZAVA). Pristine ZAVA hydrogel shows blue luminescence, but the emission can be tuned upon encapsulation of CdS dots. Time-dependent tunable (white to yellow orange) incubated gel (CdS@ZAVA gel) attributed sluggish growth inside matrix. Once are entrapped, their augmentation stopped by converting into xerogel, wherein...
We report a new strategy for the synthesis of robust hierarchical micro- and mesoporous MOFs from water stable MOFs<italic>via</italic>a selective acid etching process.
A rare porous magnesium-based metal–organic framework, Mg-MOF-1 [Mg(3,5-PDC)(H2O)], was synthesized solvothermally in DMF. Structural determination by X-ray single-crystal diffraction technique reveals that this chiral MOF (space group P6122) is constructed helical assembly of Mg2+ ions with achiral 3,5-pyridine dicarboxylates and coordinating water molecules, to form a three-dimensional framework parallel hexagonal channels. The structural detail its 0D analogue Mg-MOF-2 [Mg(2,4-PDC)(H2O)3]...
A unique proton conductive and moldable supramolecular metallogel (CuA-Ox gel) made upon mixing at room temperature well-defined stock solutions of Cu(OAc)2·H2O oxalic acid dihydrate was found to have self-healing properties. Remarkably, the system also displayed an unprecedented ability impart properties other gel networks lacking this capacity. self-healed CuA-Ox essentially same nanofibrillar morphology, thermal stability, rheological properties, conductivity as freshly prepared sample....
Abstract Oxalic acid has been proven to be the lowest molecular weight organic ligand able form robust supramolecular metallogel networks in presence of metal salts. In particular, two novel multifunctional metallogels were readily prepared at room temperature by simple mixing stock solutions Cu II acetate monohydrate or perchlorate hexahydrate and oxalic dihydrate. Formation different polymorphs unprecedented proton conduction under anhydrous conditions also demonstrated with some these materials.
A proton conducting metallogel [FNPA; ferric nitrate (FN)-phytic acid (PA)] is synthesized by immobilizing a protogenic ligand (phytic acid) using iron(iii) in DMF. The xerogel shows high conductivity of 2.4 × 10-2 S cm-1 at 120 °C, the best value known among all metal organic materials (MOMs). Marking first such attempt MOMs, an electrode made showed power density 0.94 mW cm-2 0.6 V under dry fuel cell conditions.
A unique low-molecular weight metallohydrogel (ZAVP) has been synthesized from zinc acetate and an amino acid derived ligand which shows efficient load-bearing self-healing properties. The material also uncommon multiresponsive behavior.
Self-assembled, porous coordination cages with a functional interior find application in controlled guest inclusion/release, drug delivery, separation processes, and catalysis. However, only few studies exist that describe their utilization for the development of self-assembled materials based on 3-dimensional shape external functionalization. Here, dodecyl chain-containing, acridone-based ligands (LA) shape-complementary phenanthrene-derived (LB) are shown to self-assemble heteroleptic...
Two low molecular weight metallohydrogels (ZALA and CALA) have been synthesized from an amino-acid-based ligand precursor (LA) two different metal salts [zinc acetate dihydrate (ZA) cadmium (CA), respectively. These hydrogels show a unique chemically stimulated interconversion to each other via reversible gel–sol–gel pathway. This programmable gel–sol system satisfies logic operations of basic Boolean (INHIBIT) gate. Also, these can be degraded into MOF phases at room temperature...
An exemplar competition between gelation and crystallisation phenomena was examined with an unusual synergistic multicomponent (organo)gelator solution (MGS), which consists of a well-defined methanolic (1R,2R)-1,2-diaminocyclohexane L-tartrate containing 2.4 equiv. concentrated hydrochloric acid. The optimal composition the MGS determined through meticulous solubility, structural studies, support transient mechanism based on kinetic self-assembly tartrate salt driven by hydrogen-bonding...
Eight Zn-based porous (1.2 nm) homochiral MOFs (ValZnX, AlaZnX, X = Cl(-), Br(-), HCO2(-) and CH3CO2(-)) were synthesized which possess extremely rare zeolitic (unh) topology. These show an unprecedented hydrolytic regenerability. Salt metathesis reaction performed on these 3D in water resulted 2D coordination polymers (CPs).
Two shape-persistent metallohydrogels were synthesized and found to display unique <italic>opaque gel</italic>-to-<italic>transparent gel</italic> phase transition as well gradual dissolution in water, which offered a versatile platform for drug delivery applications.
Simple, efficient conversion of viable Fe3+-based metallogels into Fe-metal–organic frameworks (MOFs) has been achieved by PdCl2-mediated gel degradation. The and the resulting MOFs have characterized, a probable mechanism for event elucidated.
A new three-dimensional magnesium formate polymorph, namely, γ-[Mg3(O2CH)6] has been synthesized via in situ anion generation method. γ-Mg-formate crystallizes space group Pbcn, and structural determination by X-ray single crystal diffraction reveals a network of Mg2+ linked anions. All anions possess similar binding mode to the metal center with one oxygen particular binds (μ1 oxygen) other two centers (μ2 oxygen). N2 adsorption studies indicate that framework displays permanent porosity....
Metallo-supramolecular self-assembly has yielded a plethora of discrete nanosystems, many which show competence in capturing guests and catalyzing chemical reactions. However, the potential low-molecular bottom-up self-assemblies development structured inorganic materials rarely been methodically explored so far. Herein, we present new type metallo-supramolecular surfactant with ability to stabilize non-aqueous emulsions for significant period. The molecular design is based on heteroleptic...