A5000031208- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Carbon dioxide utilization in catalysis
- Metal complexes synthesis and properties
- Porphyrin and Phthalocyanine Chemistry
- CO2 Reduction Techniques and Catalysts
- Catalysis for Biomass Conversion
- Metal-Catalyzed Oxygenation Mechanisms
- Advanced oxidation water treatment
- Chemical Synthesis and Reactions
- Crystallography and molecular interactions
- Catalytic Processes in Materials Science
- Zeolite Catalysis and Synthesis
- Catalysts for Methane Reforming
- Metal-Organic Frameworks: Synthesis and Applications
- Asymmetric Hydrogenation and Catalysis
- Synthetic Organic Chemistry Methods
- Covalent Organic Framework Applications
- Electrochemical Analysis and Applications
- Organic Chemistry Cycloaddition Reactions
- Synthesis and Biological Evaluation
- Polymer Foaming and Composites
- Nanotechnology research and applications
- Vanadium and Halogenation Chemistry
- Synthesis and Reactivity of Sulfur-Containing Compounds
Institute of Engineering Science
2025
Tata Steel (India)
2023-2024
Institute of Catalysis and Petrochemistry
2024
Indian Institute of Technology Dhanbad
2019-2022
Shahjalal University of Science and Technology
2017
Jadavpur University
1990-2016
University of Arkansas at Little Rock
2012-2014
Carnegie Mellon University
2001-2008
University of Kansas
2006
Osaka City University
2005
A practical, inexpensive, green chemical process for degrading environmental pollutants is greatly needed, especially persistent chlorinated pollutants. Here we describe the activation of hydrogen peroxide by tetraamidomacrocylic ligand (TAML) iron catalysts, to destroy priority pentachlorophenol (PCP) and 2,4,6-trichlorophenol (TCP). In water, in minutes, under ambient conditions temperature pressure, PCP TCP are completely destroyed at catalyst:substrate ratios 1:715 1:2000, respectively....
Exceptionally high peroxidase-like and catalase-like activities of iron(III)−TAML activators H2O2 (1: Tetra-Amidato-Macrocyclic-Ligand FeIII complexes [Fe{1,2−X2C6H2−4,5−(NCOCMe2NCO)2CR2}(OH2)]–) are reported from pH 6−12.4 25−45 °C. Oxidation the cyclometalated 2-phenylpyridine organometallic complex, [RuII(o-C6H4py)(phen)2]PF6 (2) or "ruthenium dye", occurs via equation [RuII]+1/2 H2O2+H + →□FeIII−TAML [RuIII]+H2O, following a simple rate law = kobsper[1][H2O2], that is, is independent...
Compositional doping by nitrogen and sulfur into a carbon matrix with distinct hollow sphere architecture was achieved via simple approach the co-doped material used as bifunctional catalyst for an efficient CO 2 –epichlorohydrin cycloaddition reaction.
Designing robust hybrid/bifunctional catalysts for CO 2 to DME is of increasing importance in energy and environmental science simultaneously address two important global challenges: carbon emission reduction alternative fuel development.
The reaction between an Fe(III) complex and O(2) to afford a stable catalytically active diiron(IV)-mu-oxo compound is described. Phosphonium salts of orange five-coordinated Fe(III)-TAML complexes with axial aqua ligand ([PPh(4)]1-H(2)O, tetraamidato macrocyclic species derived from 3,3,6,6,9,9-hexamethyl-3,4,8,9-tetrahydro-1H-1,4,8,11-benzotetraazacyclotridecine-2,5,7,10(6H,11H)-tetraone) react rapidly in CH(2)Cl(2) or other weakly coordinating solvents produce black mu-oxo-bridged...
Metal-free catalysis is particularly challenging in the context of green and sustainable chemistry. High toxicity associated with leaching metals from catalysts has notorious environmental impact. To surmount such an effect, homogeneous organocatalysis can provide a alternative protocol. However, it suffers drawbacks low activity selectivity, because neighboring effect solvent, devoid recyclability for operations. address issues, solid-supported heterogeneous organocatalysts are developed,...
A surfactant embedded carbon-based acid catalyst was prepared<italic>via</italic>simple physical mixing and thermal treatment to establish the relationship between hydrophobicity acidic site density for efficient glycerol acetalization reaction.
Two high spin Fe(III) complexes, [Fe(L1)2]Cl·H2O (1) and [Fe(L2)2]Cl ·4H2O·0.5MeOH (2), of Schiff base ligands aminoguanidine with salicylaldehyde pyridoxal (isolated as the hydrochloride salts L1H2+Cl− L2H32+Cl−2 respectively) are reported. X‐ray crystal structure both complexes along their spectroscopic variable temperature magnetic properties also investigated. It is found that complex 2 shows stronger zero field splitting (D = 9.5 cm−1) than 1 5.5 cm−1), probably due to greater...
The FeIII-TAML (tetra-amido macrocyclic ligand) activators 1 (Y = Cl) and 2 H2O), a (R Me, X H), b (Me, Cl), c MeO), d (Et, e (F, f are five-coordinated in the solid state (X-ray crystallography) but six-coordinated species water with two H2O axial ligands. first pKa's of aqueous ligands range 9.5−10.5. acid-induced demetalation follows equation kobs k1*[H+] + k3*[H+]3. rate constants k1* k3* vary by 5 11 orders magnitude depending on nature substituents R. highest stabilization against is...
Small-molecule synthetic homogeneous-oxidation catalysts are normally poorly protected from self-destruction under operating conditions. Achieving design control over both activity and half-life is important not only in advancing the utility of oxidation catalysts, but also minimizing hazards associated with their use disposal. Iron(III)-TAML (tetraamido-macrocyclic ligand) oxidant rapidly activate H(2)O(2) for numerous significant processes, exhibiting high differing varying half-lives...
Abstract CO 2 ‐expanded liquids (CXLs) are demonstrated to be effective reaction media for the catalytic hydroformylation of 1‐octene. The performance several rhodium catalysts, Rh(acac)(CO) , Rh(acac)[P(OPh) 3 ] Rh(acac)(CO)[P(OAr) ], and two phosphorous ligands, PPh biphephos, was compared in neat organic solvents CXLs wherein more than 50% solvent volume is replaced with dense at relatively mild temperatures (30–90°C) pressures (<12 MPa). For all enhanced turnover frequencies (TOFs)...
A series of amidoamine ligands (1) and their cobalt(III) complexes (2) were synthesized characterized by various spectroscopic techniques including (1)H-NMR X-ray crystallographic techniques. crystallography shows that one the complexes, 2a, forms a chiral coordination polymer due to bridge formation with Li(+) associated complex, although ligand is achiral. Complex 2 was employed for catalytic synthesis cyclic carbonates from epoxides carbon dioxide (CO2) in solvent free condition. strong...
Synthesis of 2-oxazolidinones from 2-aminoalcohols and carbon dioxide (CO2) in the presence 1,3-dichloro-1,1,3,3-tetraalkyldistannoxanes (1) is reported. The influence change substituent groups on metal centers Sna Snb catalyst yields products was studied. Turnover numbers as high 138 were obtained using chlorostannoxane with all butyl substituents (1a) both centers. activity 1a various substrates studied
Abstract By learning how to balance natural resource limitations and pollution prevention with economic growth, green chemistry will become the central science of sustainability. The elimination persistent pollutants is vital for a sustainable civilization. To achieve this, most important guiding concept that elemental composition technology should be shifted toward biochemistry. Oxidation currently prolific producer pollutants. Many arise from use chlorine, hypochlorite, or chlorine dioxide...