A5054297479- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Dendrimers and Hyperbranched Polymers
- Advanced Polymer Synthesis and Characterization
- Synthesis and properties of polymers
- biodegradable polymer synthesis and properties
- Magnetism in coordination complexes
- Synthetic Organic Chemistry Methods
- Surface Modification and Superhydrophobicity
- Chemical Synthesis and Analysis
- Organic Light-Emitting Diodes Research
- Metal complexes synthesis and properties
- Luminescence and Fluorescent Materials
- Chemical Synthesis and Reactions
- Nanofabrication and Lithography Techniques
- Hydrogels: synthesis, properties, applications
- Spectroscopy and Quantum Chemical Studies
- Quasicrystal Structures and Properties
- Click Chemistry and Applications
- Adhesion, Friction, and Surface Interactions
- Fluid Dynamics and Thin Films
- Pickering emulsions and particle stabilization
- Surfactants and Colloidal Systems
- Silicone and Siloxane Chemistry
- Random lasers and scattering media
University of Hyderabad
2022-2024
Central University of Tamil Nadu
2013-2021
Indian Institute of Science Bangalore
1994-2017
University of Wuppertal
2014-2015
Defence Metallurgical Research Laboratory
1986
Three oxo-bridged diiron(III) complexes of L-histidine and heterocyclic bases [Fe2(μ-O)(L-his)2(B)2](ClO4)2 (1–3), where B is 2,2′-bipyridine (bpy), 1,10-phenanthroline (phen), dipyrido[3,2-d:2′,3′-f]quinoxaline (dpq), were prepared characterized. The bpy complex 1 was structurally characterized by X- ray crystallography. molecular structure showed a {Fe2(μ-O)} core in which iron(III) FeN4O2 coordination bound to tridentate monoanionic bidentate ligands. Fe⋯Fe distance ∼3.5 Å. Fe–O–Fe unit...
Itaconic anhydride, a biosourced molecule, was readily transformed to polymerizable nonionic amphiphiles of the type R-Ita-R′; these carry an exo-chain double bond, which upon polymerization yielded amphiphilic double-brush polymers, especially when R and R′ are immiscible, consequently exhibit tendency self-segregate. DSC, WAXS, SAXS, variable temperature FT-IR studies polymers confirm occurrence self-segregation followed by crystallization cetyl segments; in most cases lamellar morphology...
Four (mu-oxo)diiron(iii) complexes [Fe(2)(mu-O)(H(2)O)(2)B(4)](ClO(4))(4) ( and ) [Fe(2)(mu-O)(mu-O(2)CMe)B(4)](ClO(4))(3) ), where B = 1,10-phenanthroline (phen) dipyrido[3,2-d:2',3'-f]quinoxaline (dpq), are prepared their DNA binding cleavage activity studied. The show propensity giving K(b) values of 3.6-9.3 x 10(4) M(-1). viscosity melting data suggest a surface and/or groove nature the to calf thymus (CT) DNA. obtained from isothermal calorimetric study indicate two modes involving...
In a series of polymers containing alternately placed electron-rich dialkoxynaphthalene (DAN) donors and electron-deficient pyromellitic diimide (PDI) acceptors linked by hexa(oxyethylene) (OE-6) segments, the ability to form folded D-A stack was intentionally disrupted random inclusion varying amounts comonomer that is devoid DAN donor units. NMR spectroscopic studies folding in these copolymers, induced NH4SCN coordinates with OE-6 segments facilitates charge-transfer (C-T) stacking,...
Abstract 1,3‐Dipolar cycloaddition of an organic azide and acetylenic unit, often referred to as the “click reaction”, has become important ligation tool both in context materials chemistry biology. Thus, development simple approaches directly generate polymers that bear either or alkyne unit gained considerable importance. We describe here a straightforward approach prepare linear hyperbranched polyesters carry terminal propargyl groups. To achieve former, we designed AB‐type monomer...
Conjugated polymer-semiconductor quantum dot (QD) composites are attracting increasing attention due to the complementary properties of two classes materials. We report a convenient method for in situ formation QDs, and explore conditions required light emission nanocomposite blends. In particular we nanocomposites blue emitting polymer poly[9,9-bis(3,5-di-tert-butylphenyl)-9H-fluorene] together with cadmium sulphide (CdS) selenide (CdSe) precursors. show emissive dots CdSe from thermally...
The density of organic semiconductor films is an important quantity because it related to intermolecular spacing which in turn determines the electronic and photophysical properties. We report thin film refractive index measurements polyfluorenes star-shaped oligofluorene truxene molecules. An ellipsometer a procedure using spectrophotometer were used determine thickness mass spin-coated films, respectively. present study effect alkyl side-chain length on volumetric materials studied....
Single-molecule force spectroscopy has proven to be an efficient tool for the quantitative characterization of flexible foldamers on single-molecule level in this study. The extent folding been estimated quantitatively first time best our knowledge, which is crucial a better understanding "folding-process" level. Therefore, study may provide guidance regulate realizing rational control over functions bulk materials.
We report an unexpected behavior of the intensity autocorrelation functions ${\mathit{C}}_{\mathit{V}\mathit{V}}$(t) (polarized) and ${\mathit{C}}_{\mathit{H}\mathit{H}}$(t) (depolarized) multiply scattered light from dense colloidal polyball crystals under certain conditions. find that saturates at large times as expected for a frozen phase, while decays to zero in short time fluid. present new phenomenological model this based on decoupled translational orientational fluctuations weakly...
Abstract Alternating and random copolymers of carbazole triphenylamine containing polychalcones are prepared by adopting simple Claisen–Schmidt route via A 2 + B approach. Terephthaldehyde derivative was used as an additional comonomer along with bisaldehyde to obtain a copolymer. The polymers readily soluble in common organic solvents the exhibited narrow poly dispersity. thermally stable no observable degradation is observed until 350°C. Further, spin cast annealed films on glass substrate...
Polystyrene (PS) latexes prepared using low-molecular-weight amphiphilic thermoresponsive surfactants exhibited reversible coagulation. The low molecular surfactant thermal transition at concentration above their critical micellar (CMC). Latexes with containing segments, i.e., poly(2-ethyloxazoline) resulted in white coagulant its LCST 85 oC and redispersed upon cooling to room temperature, while non-responsive units remain unresponsive change temperature. Comparison of the particle sizes...
The influence of surface constraints on the self-assembly liquid droplets is investigated. A semi-quantitative explanation for large scale pattern formation consisting small closely arranged inside distorted ring presented in this paper. at which become dominant also determined study. It seen that underlying roughness has a larger impact than nature polymer pore size. Comparative studies patterns formed smooth and constrained substrates are reported. simulated energy minimized shape obtained...
The conventional hexagonal, uniform breath figure pattern formed over smooth substrates and with constraints of the order 50 μm is distorted when underlying are down to 1 μm. This paper explores this phenomenon further concludes that, in addition topology-based arguments presented by other authors previously, it necessary invoke depinning effects three-phase contact line explain same. influence surface on self-assembly liquid droplets investigated. A semiquantitative explanation for...
ABSTRACT Redispersible polystyrene (PS) latexes of particle sizes in the range 200–220 nm was prepared using low‐molecular‐weight amphiphilic block copolymer surfactants. Latex powders were obtained by sun drying PS and reintroduced into solution simple mechanical agitation/stirring without any additives. DLS SEM analysis carried out for pristine/sun‐dried to compare size shape particles. A series copolymers with 2‐methyl‐2‐oxazoline 2‐butyl‐2‐oxazoline or 2‐phenyl‐2‐oxazoline repeat units...
Abstract Solution‐processable poly(dibenzalacetone) and poly(dibenzalcyclohexanone) are prepared by the condensation of 1,4‐dialkoxy‐bisbenzaldehyde acetone/cyclohexanone using classic Claisen–Schmidt condensation. The polymers readily soluble in common organic solvents due to presence alkoxy chains present on aromatic ring. availability α,β‐unsaturated ketone backbone is functionalized with hydrazine hydrate obtain poly(pyrazoline acetate), a nonconjugated polymer backbone, which shows...
Redispersible polystyrene (PS) latexes with particle sizes in the range of 250 nm were prepared using low-molecular-weight amphiphilic thermoresponsive polymeric surfactants. A series linear polymers cetyl/stearyl as hydrophobic part and poly(2-methyloxazoline)/poly(2- ethyloxazoline) about ten repeat units synthesized through cationic ring opening polymerization (CROP) used nonionic surfactants (NIS) preparation poly(styrene) by batch emulsion polymerization. Latexes surfactant containing...