A5046971544- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Ionic liquids properties and applications
- Photochemistry and Electron Transfer Studies
- Electrochemical Analysis and Applications
- Luminescence and Fluorescent Materials
- Crystallography and molecular interactions
- Molecular Sensors and Ion Detection
- Metal-Organic Frameworks: Synthesis and Applications
- Metal complexes synthesis and properties
- Magnetism in coordination complexes
- Synthesis and Characterization of Heterocyclic Compounds
- Lanthanide and Transition Metal Complexes
- Inorganic and Organometallic Chemistry
- Photochromic and Fluorescence Chemistry
- Multicomponent Synthesis of Heterocycles
- Free Radicals and Antioxidants
- Quinazolinone synthesis and applications
- Electrochemical sensors and biosensors
- Phenothiazines and Benzothiazines Synthesis and Activities
- Synthesis of Organic Compounds
- Organic Light-Emitting Diodes Research
- Synthesis and Biological Evaluation
- Analytical Chemistry and Sensors
- Topological Materials and Phenomena
Banaras Hindu University
2016-2025
University of Hyderabad
1998-2021
Shanghai Institute for Science of Science
2016-2020
Indian Institute of Technology BHU
2015-2020
Central University of Kerala
2020
Centre of Advanced Studies
2016
The University of Tokyo
2003-2008
National Yang Ming Chiao Tung University
2007
Max Planck Society
2003
University of Notre Dame
2001
Abstract A single crystal of 1-butyl-3-methylimidazolium chloride [bmim]Cl, a prototype ionic liquid, has successfully been prepared and an X-ray crystallographic analysis performed. It reveals the presence hydrogen bonding network involving anion ring as well n-butyl atoms, strong hydrophobic interaction between two groups [bmim] cations, unique corrugated sheets structure imidazolium rings. Considering similarity Raman spectra crystalline liquid states, we suspect that three dimensional...
Abstract The crystal structures of 1-butyl-3-methylimidazolium chloride [bmim]Cl and bromide [bmim]Br show that two rotational isomers, the TT form GT form, [bmim]+ cation exist in crystalline state. A vibrational analysis based on a DFT calculation indicates characterstic Raman bands three can be used as marker isomerism around C7–C8 bond n-butyl group. spectra liquid [bmim]BF4, which both sets are simultaneously observed, then prove at least isomers coexist ionic
Photophysical behavior of two series 4-amino-1,8-naphthalimide derivatives differing in the amino functionality has been studied as a function polarity medium. The location lowest singlet state systems, intramolecular charge transfer (ICT) nature, is largely controlled by conformation 4-amino group rather than its electron-donating ability. fluorescence properties systems are strongly dependent on nature well media. An increase length dialkyl groups connected to nitrogen or an size ring...
The responses to a magnet of two room-temperature ionic liquids containing tetrachloroferrate(III) ions, 1-butyl-3-methylimidazolium tetrachloroferrate (bmim[FeCl/sub 4/]) and 1-butyronitrile-3-methylimidazolium (nbmim[FeCl/sub are compared. Although their magnetic susceptibilities similar, the observed distinct from each other, suggesting that response is determined not only by susceptibility but also other factors including density, viscosity, surface tension. constitute new class fluids...
The study investigates the π···π interaction in aromatic-heteroaromatic folded scaffold, as well (NO)π···π(arene) and O···π(arene) of pyridazinone 1,2,4 triazinone their implication for design luminescent...
Water changes the physical properties of ionic liquids (ILs). In this paper, effect water on ILs is investigated at molecular level. The structure and arrangement 1-butyronitrile-3-methylimidazolium halide, in presence absence intruded molecule, have been elucidated by single-crystal X-ray crystallography near-infrared Raman spectroscopy. molecule found to change conformation n-butyronitrile chain cation. hydrogen bonding interaction between anion leading loose packing, most likely be...
An atom-efficient, eco-friendly, solvent-free, high yielding, multicomponent green strategy to synthesize highly functionalized quinazoline derivatives by the one-pot reaction of 2-aminobenzophenone, aromatic aldehyde and ammonium acetate is presented. Magnetic IL, butylmethylimidazolium tetrachloroferrate (bmim[FeCl4]) has been used successfully as a catalyst in synthetic for first time. The catalytic cycle tentative mechanism were discussed experimentally verified. Structural optical...
Time-resolved fluorescence behavior of Nile Red (NR) has been studied using a streak camera in room temperature ionic liquid, [bmim]PF6. Wavelength dependent decay and time Stokes shift have observed. The time-correlated spectral function, C(t), indicator for solvation dynamics NR [bmim]PF6, is found to be biexponential with two well-separated constants: 0.13 1.25 ns. short the long component explained terms translational motion anion collective cation anion, respectively. effect different...
A series of molecular complexes have been designed, synthesized and used as organo-catalysts for the first time very efficient Knoevenagel condensation.
The intramolecular charge transfer (ICT) process in donor–acceptor systems has tremendous importance various physical and biological systems.
The photophysical properties of 11-(4-N,N-dimethylaminophthalimido)undecanoic acid (DAPL), a surfactant covalently labeled with fluorophore, in homogeneous and micellar media are reported. remarkable sensitivity the fluorescence DAPL to polarity is attributed existence low-lying nonfluorescent twisted intramolecular charge transfer (TICT) state. found be an excellent sensor for following aggregation process. Although shows enhanced binding micelles, quenching experiments spectral intensity...
Six heteroleptic dipyrrinato complexes [Ni(fcdpm)(dedtc)] (1), [Ni(fcdpm)(dipdtc)] (2), [Ni(fcdpm)(dbdtc)] (3), [Pd(fcdpm)(dedtc)] (4), [Pd(fcdpm)(dipdtc)] (5), and [Pd(fcdpm)(dbdtc)] (6) (fcdpm = 5-ferrocenyldipyrromethene; dedtc diethyldithiocarbamate; dipdtc diisopropyldithiocarbamate; dbdtc dibutyldithiocarbamate) have been synthesized characterized by elemental analyses spectral (ESI-MS, IR, 1H, 13C NMR, UV–vis) electrochemical studies. Crystal structures of 1, 2, 4, 5 authenticated...
A series of 4-aminonitrobenzoxadiazole (NBD) derivatives in which the amino nitrogen is part a four- to seven-membered heterocyclic ring and second 4-dialkylamino NBD with different alkyl chain lengths have been prepared fully characterized their photophysical properties investigated an attempt find out nonradiative deactivation pathway fluorescent state these systems. It observed that fluorescence are highly sensitive structure moiety polarity surrounding media. shown rate constants for...