Vapour-induced solid-state C–H bond activation for the clean synthesis of an organopalladium biothiol sensor

Room-temperature accelerated aging in the solid state has been applied for quantitative azobenzene C–H bond activation by Pd(OAc)2. Water-soluble dicyclopalladated methyl orange is a selective chromogenic biothiol sensor at physiologically-relevant micromolar concentrations in aqueous media.

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Zirconium-Doped Chromium IV Oxide Nanocomposites: Synthesis, Characterization, and Photocatalysis towards the Degradation of Organic Dyes

Catalysts ◽

10.3390/catal11010117 ◽

2021 ◽

Vol 11 (1) ◽

pp. 117

Author(s):

Zahir Muhammad ◽

Farman Ali ◽

Muhammad Sajjad ◽

Nisar Ali ◽

Muhammad Bilal ◽

...

Keyword(s):

Methylene Blue ◽

Photocatalytic Activity ◽

Methyl Orange ◽

Solid State ◽

Room Temperature ◽

Organic Dyes ◽

Uv Light ◽

Heterogeneous Photocatalysis ◽

Ft Ir ◽

Complete Mineralization

Degradation of organic dyes and their byproducts by heterogeneous photocatalysts is an essential process, as these dyes can be potentially discharged in wastewater and threaten aquatic and xerophyte life. Therefore, their complete mineralization into nontoxic components (water and salt) is necessary through the process of heterogeneous photocatalysis. In this study, Zr/CrO2 (Zirconium-doped chromium IV oxide) nanocomposite-based photocatalysts with different compositions (1, 3, 5, 7 & 9 wt.%) were prepared by an environmentally friendly, solid-state reaction at room temperature. The as-prepared samples were calcined under air at 450 °C in a furnace for a specific period of time. The synthesis of Zr/CrO2 photocatalysts was confirmed by various techniques, including XRD, SEM, EDX, FT-IR, UV-Vis, and BET. The photocatalytic properties of all samples were tested towards the degradation of methylene blue and methyl orange organic dyes under UV light. The results revealed a concentration-dependent photocatalytic activity of photocatalysts, which increased the amount of dopant (up to 5 wt.%). However, the degradation efficiency of the catalysts decreased upon further increasing the amount of dopant due to the recombination of holes and photoexcited electrons.

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One-Pot Synthesis of Water Soluble, Extremely Small-Sized Superparamagnetic Magnetite Nanoparticles

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.531.219 ◽

2012 ◽

Vol 531 ◽

pp. 219-222

Author(s):

Li Hua Shen ◽

Ting Shang ◽

Jun Zhou ◽

Dong Wang ◽

Yu Han ◽

...

Keyword(s):

Magnetite Nanoparticles ◽

Room Temperature ◽

Colloidal Stability ◽

Aqueous Media ◽

Mri Contrast Agents ◽

Water Soluble ◽

Potential Candidate ◽

One Pot ◽

Mri Contrast

Extremely small-sized superparamagnetic magnetite nanoparticles of 3Cit). The resulting Cit-coated magnetite nanoparticles exhibited long-term colloidal stability in aqueous media without any surface modification. Regarding the magnetic properties, the nanoparticles were superparamagnetic at room temperature, and might be the potential candidate for MRI contrast agents.

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Water-soluble boron carbon oxynitride dots with excellent solid-state fluorescence and ultralong room-temperature phosphorescence

Nano Research ◽

10.1007/s12274-020-2999-y ◽

2020 ◽

Vol 13 (12) ◽

pp. 3261-3267

Author(s):

Shenghui Han ◽

Gang Lian ◽

Xiaoliang Zeng ◽

Zhaozhen Cao ◽

Qilong Wang ◽

...

Keyword(s):

Solid State ◽

Room Temperature ◽

Water Soluble ◽

Room Temperature Phosphorescence ◽

Solid State Fluorescence ◽

Boron Carbon

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Designing Microparticle-Impregnated Polyelectrolyte Composite: The Combination of ATRP, Fast Azidation, and Click Reaction Using a Single-Catalyst, Single-Pot Strategy

International Journal of Molecular Sciences ◽

10.3390/ijms20225582 ◽

2019 ◽

Vol 20 (22) ◽

pp. 5582 ◽

Cited By ~ 2

Author(s):

Ranjit De ◽

Minhyuk Jung ◽

Hohjai Lee

Keyword(s):

Room Temperature ◽

Click Reaction ◽

Aqueous Media ◽

Functional Polymers ◽

Polymer Particle ◽

Water Soluble ◽

Synthetic Procedure ◽

Plausible Mechanism ◽

Simple Pathway ◽

Polystyrene Microparticles

Polystyrene microparticles were covalently impregnated into the networks of functional polyelectrolyte chains designed via a tandem run of three reactions: (i) synthesis of water-soluble polyelectrolyte, (ii) fast azidation and (iii) a ‘click’ reaction, using the single-catalyst, single-pot strategy at room temperature in mild aqueous media. The model polyelectrolyte sodium polystyrenesulfonate (NaPSS) was synthesized via the well-controlled atom transfer radical polymerization (ATRP) whose halogen living-end was transformed to azide and subsequently coupled with an alkyne carboxylic acid through a ‘click’ reaction using the same ATRP catalyst, throughout. Halogen to azide transformation was fast and followed the radical pathway, which was explained through a plausible mechanism. Finally, the success of microparticle impregnation into the NaPSS network was evaluated through Kaiser assay and imaging. This versatile synthetic procedure, having a reduced number of discrete reaction steps and eliminated intermediate work-ups, has established a fast and simple pathway to design functional polymers required to fabricate stable polymer-particle composites where the particles are impregnated covalently and controllably.

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Quadrol-Pd(II) complexes: phosphine-free precatalysts for the room-temperature Suzuki-Miyaura synthesis of nucleoside analogues in aqueous media

Dalton Transactions ◽

10.1039/d1dt03778a ◽

2022 ◽

Author(s):

Jose Luis Serrano ◽

Sujeet Gaware ◽

Jose Antonio Pérez de Haro ◽

Jose Pérez ◽

Pedro Lozano ◽

...

Keyword(s):

Room Temperature ◽

Aqueous Media ◽

Water Soluble ◽

Nucleoside Analogues ◽

Synthesis And Characterization ◽

First Time

Commercially available Quadrol, N,N,N',N'-tetrakis(2-hydroxypropyl)ethylenediamine (THPEN), has been used for the first time as N^N- donor neutral hydrophilic ligand in the synthesis and characterization of new water soluble palladium (II) complexes...

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Synthesis of functionalized-thermo responsive-water soluble co-polymer for conjugation to protein for biomedical applications

MRS Proceedings ◽

10.1557/opl.2013.86 ◽

2013 ◽

Vol 1498 ◽

pp. 121-125

Author(s):

Ali Fathi ◽

Hua Wei ◽

Wojciech Chrzanowski ◽

Anthony S. Weiss ◽

Fariba Dehghani

Keyword(s):

Biomedical Applications ◽

Room Temperature ◽

Aqueous Media ◽

Ester Group ◽

Biological Properties ◽

Water Soluble ◽

Hydroxyethyl Methacrylate ◽

Musculoskeletal Tissue ◽

Temperature Responsive ◽

Model Protein

ABSTRACTThe aim of this study was to develop a thermo-responsive and bioactive polymer with suitable mechanical properties for musculoskeletal tissue engineering applications. A copolymer was synthesized that comprised of hydrophilic polyethylene glycol, thermo responsive N-isopropylacrylamide (NIPAAm), 2-hydroxyethyl methacrylate-poly(lactide) (HEMA-PLA) to enhance mechanical strength and an active N-acryloxysuccinimide (NAS) group for conjugation to proteins to enhance biological properties. A model protein such as elastin was used to assess the feasibility of conjugating this polymer to protein. The results of 1HNMR analyses confirmed that random polymerization was viable technique for synthesis of this copolymer. The co-polymers synthesized with PEG content of 3 mol% were water soluble. A hydrogel was created by dissolving the copolymer and elastin below room temperature in aqueous media, followed by rapid gelation at 37°C. The results of Fourier transform infrared analyses confirmed the conjugation of protein to copolymer due to significant reduction of ester group absorption (1735 cm−1). This data confirmed molecular interaction between protein and the temperature responsive co-polymer. Our preliminary results demonstrated that it is viable to tune different properties of this hydrogel by changing the composition of co-polymer.

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Selective conversion of aldehydes to carboxylic acids by hemoglobin and air

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s1088424618500840 ◽

2018 ◽

Vol 22 (08) ◽

pp. 679-685 ◽

Cited By ~ 1

Author(s):

Mahdi Hajimohammadi ◽

Maryam Khalaji Verjani ◽

Hoda Ghasemi ◽

Nasser Safari ◽

Günther Knör

Keyword(s):

Carboxylic Acids ◽

Mass Spectroscopy ◽

Room Temperature ◽

Aqueous Media ◽

Water Soluble ◽

Feasible Method ◽

Vis Spectroscopy ◽

Major Route ◽

High Valent

A new green, environmentally friendly and economically feasible method for the oxygenation of benzaldehyde, cinnamaldehyde, 4-chlorobenzaldehyde and 4-bromobenzaldehyde to the corresponding carboxylic acids using air in the presence of hemoglobin as a water-soluble catalyst in aqueous media at room temperature is illustrated. The resulting products were obtained with (77–100%) conversion and 100% selectivity within a reasonable amount of time. In addition, the first direct characterization of a high-valent iron intermediate (HbFe[Formula: see text]O) measured using Mass Spectroscopy (MS) and UV-vis spectroscopy proved that the major route for oxidation of aldehydes is (HbFe[Formula: see text]O) production.

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Improved Sol-Gel Materials for Efficient Solid State Dye Lasers

MRS Proceedings ◽

10.1557/proc-329-279 ◽

1993 ◽

Vol 329 ◽

Cited By ~ 3

Author(s):

Michael Canva ◽

Patrick Georges ◽

Jean-Fran^ois Perelgritz ◽

Alain Brun ◽

Fréddric Chaput ◽

...

Keyword(s):

Solid State ◽

Physical Properties ◽

Room Temperature ◽

Sol Gel ◽

Tunable Lasers ◽

Optical Quality ◽

Dye Lasers ◽

Laser Dyes ◽

Host Matrix ◽

Host Matrices

AbstractPhotoresistant laser dyes were trapped in silica based xerogel host matrices to obtain solid state tunable lasers. For this purpose very dense xerogel samples with improved chemical and physical properties were prepared at room temperature by the sol-gel technology. The as-prepared materials were polished to obtain optical quality surfaces and were used as new lasing media.Lasing action of such different dyes as rhodamine, perylene and pyrromethene doping dense sol-gel matrices was demonstrated. Efficiencies of 30 % or lifetimes of more than 100,000 shots were achieved with different new ≤dye dopant/host matrix≥ couples. Their different performances are reviewed and discussed.

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Temperature Dependence of the Self-Assembled Styrene Based Random Ionomers in Aqueous Solution

MRS Proceedings ◽

10.1557/proc-775-p6.27 ◽

2003 ◽

Vol 775 ◽

Author(s):

Sung-Hwa Oh ◽

Ju-Myung Song ◽

Joon-Seop Kim ◽

Hyang-Rim Oh ◽

Jeong-A Yu

Keyword(s):

Partition Coefficients ◽

Room Temperature ◽

Aqueous Media ◽

The Self ◽

Spectroscopic Methods ◽

Ion Content ◽

Repeat Units ◽

Notable Effect ◽

Order Of Magnitude ◽

Experimental Errors

AbstractSolution behaviors of poly(styrene-co-sodium methacrylate) were studied by fluorescence spectroscopic methods using pyrene as a probe. The mol% of methacrylate was in the range 3.6–9.4. Water and N,N-dimethylforamide(DMF) mixture was used as a solvent (DMF/water = 0.2 mol %). The critical micelle (or aggregation) concentrations of ionomers and the partition coefficients of pyrene were obtained the temperature range 10–80°C. At room temperature, the values of CMCs (or CACs) were in the range 4.7 ×10-6 5.3 ×10-6 g/mL and we could not find any notable effect of the content of ionic repeat units within the experimental errors. Unlike CMCs, as the ion content increased, partitioning of pyrene between the hydrophobic aggregates and an aqueous media decreased from 1.5 ×105 to 9.4 ×104. As the temperature increased from 10 to 80 °C, the values of CMCs increased less than one order of magnitude. While, the partition coefficients of pyrene decreased one order of magnitude and the effect of the ion content became negligible.

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Tyrosine-Selective Bioconjugation with Iminoxyl Radicals

10.26434/chemrxiv.12278717 ◽

2020 ◽

Author(s):

Katsuya Maruyama ◽

Takashi Ishiyama ◽

Yohei Seki ◽

Kounosuke Oisaki ◽

Motomu Kanai

Keyword(s):

Reaction Time ◽

Steric Hindrance ◽

Room Temperature ◽

Water Soluble ◽

Light Irradiation ◽

Sodium Ascorbate ◽

Iminoxyl Radical ◽

Short Reaction Time ◽

Modified Peptides ◽

The Stability

A novel Tyr-selective protein bioconjugation using the water-soluble persistent iminoxyl radical is described. The conjugation proceeded with high Tyr-selectivity and short reaction time under biocompatible conditions (room temperature in buffered media under air). The stability of the conjugates was tunable depending on the steric hindrance of iminoxyl. The presence of sodium ascorbate and/or light irradiation promoted traceless deconjugation, restoring the native Tyr structure. The method is applied to the synthesis of a protein-dye conjugate and further derivatization to azobenzene-modified peptides.

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