A5038584775- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Crystallography and molecular interactions
- Enhanced Oil Recovery Techniques
- Synthesis and biological activity
- Hydrocarbon exploration and reservoir analysis
- Multicomponent Synthesis of Heterocycles
- Petroleum Processing and Analysis
- Catalytic C–H Functionalization Methods
- Photochromic and Fluorescence Chemistry
- Hydraulic Fracturing and Reservoir Analysis
- Nonlinear Optical Materials Research
- Nonlinear Optical Materials Studies
- Catalytic Alkyne Reactions
- Synthesis and Characterization of Pyrroles
- Liquid Crystal Research Advancements
- Synthesis and Reactivity of Sulfur-Containing Compounds
- Asymmetric Synthesis and Catalysis
- Organophosphorus compounds synthesis
- Organic and Molecular Conductors Research
- Coordination Chemistry and Organometallics
- Photochemistry and Electron Transfer Studies
- Porphyrin and Phthalocyanine Chemistry
- Organic Electronics and Photovoltaics
- Crystal structures of chemical compounds
Missouri University of Science and Technology
2012-2016
New Mexico Highlands University
2007-2013
Georgia Institute of Technology
2010
New Mexico Institute of Mining and Technology
2008
Russian Academy of Sciences
2008
Pyrano[3,2-c]pyridone and pyrano[3,2-c]quinolone structural motifs are commonly found in alkaloids manifesting diverse biological activities. As part of a program aimed at simplification bioactive natural products utilizing multicomponent synthetic processes, we developed compound libraries based on these privileged heterocyclic scaffolds. The selected library members display low nanomolar antiproliferative activity induce apoptosis human cancer cell lines. Mechanistic studies reveal that...
Abstract This work involves the synthesis of a nanocomposite hydrogel from just polymer and clay without use conventional organic crosslinkers. Conventional design usually multicomponent reaction that incorporates monomer (or polymer), initiator, an crosslinker. However, because many limitations, setbacks, inconsistencies involved with crosslinkers, authors herein present only. It was found these hydrogels show surprising mechanical toughness, tensile moduli, strengths. Study gel behavior...
A new series of unsymmetrical diphenylaminofluorene-based chromophores with various strong π-electron acceptors were synthesized and fully characterized. The systematic alteration the structural design facilitated investigation effects such as molecular symmetry strength electron-donating and/or -withdrawing termini have on optical nonlinearity. In order to determine electronic geometrical properties novel compounds, a thorough was carried out by combination linear nonlinear spectroscopic...
The present work presents a nanocomposite preformed particle gel for conformance control in mature oilfields. This product was observed to have better performance than conventional hydrogels without nanomaterials. Preformed hydrogel designed by the reaction of monomer, initiator, crosslinker, additives, and calcium montmorillonite nanomaterial, whereas is from just crosslinker additives. presence nanomaterial design affords it tremendous improvement properties behavior compared any...
A multicomponent reaction of indane-1,3-dione, an aldehyde and amine-containing aromatic compound leading to the formation indenopyridine-based heterocyclic medicinal scaffolds has been investigated. It was found that yields significantly improve when oxygen gas is bubbled through mixture, facilitating oxidation intermediate dihydropyridine-containing compounds their counterparts. Investigation scope revealed formaldehyde, as well various aliphatic, heteroaromatic aldehydes, works component....
A one-pot preparation of the 2,2'-dibromo-1,1'-bisheteroarenes 3a-d from bromo-heteroarenes utilizing sequence base-catalyzed halogen dance (BCHD) reaction and CuCl(2)-promoted oxidative coupling in situ formed alpha-lithio-beta-halo-heteroarenes 2a-d provides a convenient access to precursors for tricyclic heteroaromatic cores. The structures 3a,b,d, 6, 9 were confirmed by single-crystal X-ray analysis, dibromides 3a 3b used dithieno-[2,3-b:3',2'-d]-pyrrole 10a its selenophene analogue 10b,...
A series of trialkylsilyl-substituted 2,2'-dithiophene, 4,4'-di-n-hexyl-2,2'-dithiophene, 5,5'-dithiazole, and 2,2'-diselenophene with carbonyl (2a-d) α-dicarbonyl bridges (3a-d) were prepared from readily available dihalides, using double lithiation followed by trapping N,N-dimethylcarbamoyl chloride or diethyl oxalate (or N,N-dimethylpiperazine-2,3-dione), respectively. Cyclic voltammetry reveals that the first half-wave reduction potentials for this compounds span a wide range, -1.87 to...
The two-photon absorption (2PA) spectrum of an organic single crystal is reported. grown by self-nucleation a subsaturated hot solution acetonitrile, and composed asymmetrical donor-π-acceptor cyanine-like dye molecule. To our knowledge, this the first report 2PA crystals made from dye. linear nonlinear properties crystalline material are investigated compared with molecular toluene its monomeric form. maximum polarization-dependent coefficient 52 ± 9 cm/GW, which more than twice as large...
Metal-organic frameworks (MOFs) can provide a matrix for the assembly of organic chromophores into well-defined geometries, allowing tuning material properties and study structure-property relationships. Here, we report on effect coordinated metal ion luminescence eight isostructural MOFs having formula M(1)2M(2)L3(DMF)2 (M(1) = M(2) Zn (1), Cd (2), Mn (3), Co (4); M(1) Zn, (5), (6), (7); Co, (8); L trans-4,4'-stilbene dicarboxylate), synthesized by reaction appropriate nitrate or mixtures...
Going zigzag, helical, or in-between: Angular phenylenes show a propensity for adding alkynes from the bay region in processes catalyzed by [Ni(cod)(PMe3)2] (see scheme). These transformations generate novel strain- and electronically activated phenacenes. Mechanistic studies conjunction with DFT calculations (R=Ph) provide plausible mechanistic picture. Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not...
A series of dihalo- and bis-aroyl-substituted benzo[1,2-b:6,5-b′]dithiophene-4,5-diones were synthesized, their electronic, electrochemical, electrical properties investigated. Synthetic strategies to increase (i) the conjugation length base molecular structure – through introduction thiophene units bearing electronically neutral substituents (hydrogen or alkyl groups) strong electron-withdrawing pentafluorobenzoyl group(s) (ii) electron affinity by moving a...
Pancratistatin is a phenanthridone-type natural product isolated from several plants of the Amaryllidaceae family. Its potent antiproliferative, antivascular, antiviral, and antiparasitic properties have attracted attention synthetic, biological, medicinal chemists. Pancratistatin's low availability complex structure steered many these research projects toward preparation its simplified synthetic analogues with useful levels activity. In this work we developed chemistry aimed at...
The chemistry of electron deficient π-acceptors offers unique challenges in the rational design and synthesis organic dyes for use solar cells. We have synthesized 2-cyano-2-(3-cyano-4-((E)-4-(dibutylamino)styryl)-5,5-dimethylfuran-2(5H)-ylidene)ethanoic acid (2), a dye containing an carboxylated version strongly withdrawing TCF group by way stepwise isolation 2,5-dihydro-2-imino-4,5,5-trimethylfuran-3-carbonitrile (5), previously only available as intermediate via microwave chemistry. this...
Zickzackförmig, helical oder dazwischen: Angulare Phenylene addieren Alkine in [Ni(cod)(PMe3)2]-katalysierten Prozessen bevorzugt der Bucht-Region. Die Umwandlungen ergeben neuartige spannungs- und elektronisch aktivierte Phenacene. Mechanistische Studien im Verbund mit DFT-Rechnungen (R=Ph) liefern einen plausiblen Mechanismus.
Abstract Gel treatments have been implemented as a cost-effective method for plugging high-permeability zones and thus improving sweep efficiency in reservoirs. However, when extensive cross-flows exist between formation layers, near wellbore gel become less efficient. Polymer was used polymer flooding to increase the viscosity of injected fluids order improve oil recovery. is limited by dramatic loss (80–90%) caused various shearing degradations during injection process transport at...
A series of squaraine dyes, based on 2,4-bis[4-(N,N-di-n-alkylamino)-2-hydroxyphenyl] including ethyl, propyl, butyl, pentyl, hexyl and heptyl derivatives, were synthesised by condensation the corresponding 4-(N,N-di-n-alkylamino)-2-hydroxyphenol with squaric acid. The thermal behaviour was recorded using both thermogravimetic analysis differential scanning calorimetry while their crystalline structures elucidated via single-crystal X-ray diffraction. length alkyl chain proved to have a...
CpCo(CO)2 catalyzes the cocyclization of ortho-diethynylthiophenes and -pyridines with alkynes to construct corresponding thia- azaphenylenes. This strategy is applied synthesis linear 1-aza[3]phenylene, first higher heterophenylene.