Complexing reagent

Ebook "Luminescent and photoactive transition metal complexes as biomolecular probes and cellular reagents" starts with a chapter contributed by Professor Alexis D. Ostrowski and Professor Peter C. Ford on the photochemical delivery of the gastrotransmitters nitric oxide and carbon monoxide. The emphasis is on the molecular design and photochemical properties of transition metal complexes that serve as photoactivated nitric oxide releasing moieties (NORMs) and carbon monoxide releasing moieties (CORMs).

266p tudohanhtau1006 29-03-2024 4 1   Download

Ebook "Alkaline-earth metal compounds: Oddities and applications" presents critical overviews of research results in organometallic chemistry. As our understanding of organometallic structure, properties and mechanisms increases, new ways are opened for the design of organometallic compounds and reactions tailored to the needs of such diverse areas as organic synthesis, medical research, biology and materials science.

282p coduathanh1122 27-03-2024 7 1   Download

Ebook "Modern organoaluminum reagents: Preparation, structure, reactivity and use" provides readers with contents including: simple trivalent organoaluminum species - perspectives on structure, bonding, and reactivity; organoaluminum complexes with bonds to s-block, p-block, d-block, and f-block metal centers; low valent organoaluminum (+I, +II) species; organoaluminum species in homogeneous polymerization catalysis;...

323p coduathanh1122 27-03-2024 3 1   Download

Ebook "Organo-di-metallic compounds (or reagents): Synergistic effects and synthetic applications" presents critical overviews of research results in organometallic chemistry. As our understanding of organometallic structure, properties and mechanisms increases, new ways are opened for the design of organometallic compounds and reactions tailored to the needs of such diverse areas as organic synthesis, medical research, biology and materials science.

210p nhanphanguyet 28-01-2024 2 2   Download

In this study, we developed a simple, fast, and inexpensive method to analyze cefotaxime in powder for injection based on the charge transfer reaction with the DDQ reagent in acetonitrile solvent.

7p viargus 03-03-2023 9 3   Download

For more than five decades, dithizone has been widely used as an analytical reagent. This ligand forms strongly colored complexes with metal ions and this ability to form complexes can be used for extraction/removal of certain metal ions in addition to analytical determination. In static mode, the supercritical carbon dioxide extraction of copper and lead ions from aqueous solutions after complexation by the dithizone ligand is studied (at two different conditions: a) p = 120 bar, T = 30 °C, and b) p = 72 bar, T = 50 °C).

9p lyhuyenthu 31-01-2023 6 2   Download

In this work we present a synthesis strategy for the preparation of Stober-type ¨ mesoporous particles functionalized with inorganic species. The procedure is based on a combination of the Atrane and the Stober ¨ methods. Both as a source of silicon and of the incorporated heteroelements (Fe, Zn, Al, Ti) the corresponding atrane complexes are used as hydrolytic reagents.

14p vironald 15-12-2022 5 2   Download

A new spectrophotometric method for determinating trace amounts of fluoride has been introduced in this article. The principle of the method is based on the reaction of fluoride with a complex of aluminum ion and xylenol orange reagent (Al-XO).

5p vichristinelagarde 04-07-2022 8 1   Download

A new system was developed for the preconcentration and determination of cadmium levels in water following online cloud-point extraction and analysis by flame atomic absorption spectrometry. The method uses cloud-point extraction of the complex formed between Cd(II) ions and the reagent 2-(5-bromo-2’-thiazolylazo)- p-cresol (Br-TAC) using Triton X-114 as a surfactant. The main steps of the procedure, extraction, filtration, and detection were conducted online.

9p langthannam 29-12-2021 7 0   Download

The ability of oxime-containing acetylcholinesterase reactivators BT-07 (K005), BT-08 (K033), BT-07-4M (K074), and obidoxime (H2LX2, X = Cl−, Br−) to bind palladium(II) or platinum(II) cations was evaluated in aqueous solutions (pH 7.4) at metal-to-ligand molar ratio varying from 1:10 to 10:1. Spectral changes were monitored within a week after mixing the reagents in the range from 220 nm to 500 nm. Results showed that depending on chemical structure and reaction time, oximes form two complex species of composition, [MHL]3+ or [M2L]4+ (M = Pd(II), Pt(II)).

11p tudichquannguyet 29-11-2021 9 1   Download

Lipid-soluble endogenous antioxidants, such as tocopherols, protect biological structures from oxidative damage through their chain-breaking ability and thus the development of a simple method for tocopherol determination is important. In this study, a novel optical sensor-based method was proposed for determining total tocopherol content (TTC) of serum, with selectivity for α-tocopherol over β -carotene.

8p tudichquannguyet 29-11-2021 27 1   Download

An efficient and facile method has been developed for the synthesis of alkyl bromides from various alcohols under mild conditions using a triphenylphosphine (PPh3)/1,2-dibromotetrachloroethane (DBTCE) complex in excellent yields and very short time (5 min). This method can also be applied for the transformation of chiral alcohols to their corresponding bromides in very high enantiomeric excess. The PPh3 /DBTCE complex is also successfully applied to ring-opening reactions of cyclic ethers in mild conditions.

7p tudichquannguyet 29-11-2021 4 1   Download

In this paper, a fast, cheap, simple, sensitive and selective spectrophotometric method based on high spin peroxo-Fe(III)-EDTA complex in the alkaline medium was developed for the determination of hydrogen peroxide (H2O2) in real water samples. The purple-coloured complex with a maximum absorbance at a wavelength of 525 nm was formed. Various parameters such as type of stabilizer reagent and its concentration, reaction time, Fe(III), EDTA and NH3 concentration were optimized. The method was confirmed with the Beer’s law with a molar absorption coefficient of 267.36 L mol−1cm −1 in the 8.

13p tudichquannguyet 29-11-2021 13 2   Download

An extraction method was tested for biomonitoring the biofilm samples containing heavy metals. The fractionation of metal complexes was performed via C-18-HPLC-ICP-MS and MALDI-MS, respectively. The extraction power of some reagents was determined for the heavy metal extraction from biofilm samples collected in Erdemli coast in the Mediterranean Sea. The ammonium acetate solution giving the highest extraction results was found as a suitable extraction reagent. The concentration and pH of the ammonium acetate solution were optimized and found as 1 M and 5, respectively.

14p tudichquannguyet 29-11-2021 12 1   Download

In this study, the conformation of ML2 complexes of new thiosemicarbazone reagents with metal cations Cd2+, Ni2+, Cu2+, Hg2+, Pb2+, Mn2+, and Zn2+ is investigated. The methods include MM+ and PM3 calculations with the Monte Carlo techniques using the Metropolis algorithm in the temperature range of 298–473 K. The initial selection conformation was carried out randomly after 15 repeated conformations, and 30 conformations were rejected.

9p nguaconbaynhay10 20-02-2021 12 2   Download

Effective quality assessment is an important part of any high-throughput flow cytometry data analysis pipeline, especially when considering the complex designs of the typical flow experiments applied in clinical trials. Technical issues like instrument variation, problematic antibody staining, or reagent lot changes can lead to biases in the extracted cell subpopulation statistics.

15p viwyoming2711 16-12-2020 19 0   Download

In addition, PAN was a colored reagent and absorption at a wavelength near to the wavelength of maximum absorbance of PAN complexes with metal ions lead to the mutual overlap between the reagent and the complex spectrum.

6p tamynhan9 02-12-2020 13 2   Download

The present study was aimed to evaluate the bioactive phytochemical constituents of Adina cordifolia leaves, with this broad objectives the total phenolic contents (TPC), total flavonoid contents (TFC), total antioxidant potential and GC-MS analysis of leaf extracts were carried out. For the identification of medicinally important compounds in Adina cordifolia leaf, extracts were prepared using cold extraction method in different solvents of varying polarities viz., chloroform, ethyl acetate, acetone and methanol.

13p gaocaolon5 14-06-2020 7 1   Download

A simple and rapid vortex assisted ionic liquid based liquid–liquid microextraction technique (VALLME) was proposed for preconcentration of trace levels of cadmium. According to this method, the extraction solvent was dispersed into the aqueous samples by the assistance of vortex agitator. Cadmium preconcentration was mediated by chelation with the 8-hydroxyquinoline (oxine) reagent and an IL, 1-octyl-3-methylimidazolium hexafluorophosphate ([Omim][PF6]) was chosen as the extraction solvent to extract the hydrophobic complex.

7p kethamoi1 17-11-2019 23 0   Download

The aims of the study were to examine (1) effect of high P contents on the correlation coefficient between absorbance and P concentration, (2) effects of time duration including storage time and duration since addition of colordeveloping reagent, and (3) effects of the presences of silicate, nitrite, and chromium on P absorbance of the UV-Vis at 882-nm wavelength.

9p meolep3 18-12-2018 34 0   Download