Versatile coordination patterns in the reaction system of N-benzoyl-N′-(2-pyridyl)thiourea with CuCl2. Their reaction conditions, systematic isolation and crystal structures

2002 ◽  
Vol 26 (11) ◽  
pp. 1629-1633 ◽  
Author(s):  
Gang Li ◽  
De-Ji Che ◽  
Zi-Feng Li ◽  
Yu Zhu ◽  
Da-Peng Zou
Keyword(s):  
Crystal Structures ◽  
Reaction System ◽  
Reaction Conditions ◽  
Coordination Patterns

Effect of Reaction Conditions on the Volatile Pyrazines Components of Defatted Flaxseed Meal in the Maillard Reaction System

2020 ◽  
Vol 97 (12) ◽  
pp. 1385-1399
Author(s):  
Lin Li ◽  
Lin Wang ◽  
Jiang Liu ◽  
Jiawei Yang ◽  
Wenxia Wu ◽  
...  
Keyword(s):  
Maillard Reaction ◽  
Reaction System ◽  
Reaction Conditions ◽  
Flaxseed Meal

Varying structural motifs in the salen based metal complexes of Co(ii), Ni(ii) and Cu(ii): synthesis, crystal structures, molecular dynamics and biological activities

2016 ◽  
Vol 45 (47) ◽  
pp. 19096-19108 ◽  
Author(s):  
Anoop Kumar Saini ◽  
Pratibha Kumari ◽  
Vinay Sharma ◽  
Pradeep Mathur ◽  
Shaikh M. Mobin
Keyword(s):  
Molecular Dynamics ◽  
Metal Complexes ◽  
Crystal Structures ◽  
Biological Activities ◽  
Biological Applications ◽  
Reaction Conditions ◽  
Structural Motifs

Four new metal complexes which demonstrates varying structural motifs from monomeric to dimeric to tetrameric complexes by slightly altering the reaction conditions and their biological applications.

The Synthesis of Zinquin Ester and Zinquin Acid, Zinc(II)-Specific Fluorescing Agents for Use in the Study of Biological Zinc(II)

1996 ◽  
Vol 49 (5) ◽  
pp. 561 ◽  
Author(s):  
IB Mahadevan ◽  
MC Kimber ◽  
SF Lincoln ◽  
ERT Tiekink ◽  
AD Ward ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Crystal Structures ◽  
Electrophilic Substitution ◽  
Ethyl Acrylate ◽  
Heck Coupling ◽  
Ethyl Bromoacetate ◽  
Reaction Conditions ◽  
Bromo Derivative ◽  
Boron Tribromide

The syntheses of Zinquin ester [ethyl [2-methyl-8-(p- tolylsulfonylamino )-6-quinolyloxy]acetate] and the corresponding acid, both of which are zinc(II)-specific fluorophores , are described. 6-Methoxy-2-methyl-8-(p- tolylsulfonylamino ) quinoline (2) can be demethylated , with boron tribromide, to form either the expected phenol or a mixture of the phenol and the corresponding 5-bromo derivative depending upon the reaction conditions. These compounds react with ethyl bromoacetate to give the corresponding esters, as well as the 5-ethoxycarbonyl derivative formed by electrophilic substitution. Halogenation of the sulfonamide (2) occurs readily at the 5-position. The 5-iodo product undergoes a Heck coupling with ethyl acrylate . The crystal structures of ethyl [5-ethoxycarbonylmethyl-2-methyl-8-(p- tolylsulfonylamino )-6-quinolyloxy]acetate and [5-carboxymethyl-2-methyl-8-(p- tolylsulfonylamino )-6-quinolyloxy]acetic acid are described.

Variation of nuclearity in NiII complexes of a Schiff base ligand: crystal structures and magnetic studies

CrystEngComm ◽  
2019 ◽  
Vol 21 (31) ◽  
pp. 4620-4631 ◽  
Author(s):  
Tanmoy Kumar Ghosh ◽  
Prithwish Mahapatra ◽  
Subrata Jana ◽  
Ashutosh Ghosh
Keyword(s):  
Schiff Base ◽  
Crystal Structures ◽  
Schiff Base Ligand ◽  
Magnetic Coupling ◽  
Magnetic Studies ◽  
Reaction Conditions

Four NiII complexes have been synthesized by changing the reaction conditions and stoichiometry of the reactants. The magnetic coupling in the NiII4 complex is ferromagnetic whereas that in the NiII6 complex is antiferromagnetic.

scholarly journals Catalytic Dehydration of Fructose to 5-Hydroxymethylfurfural (HMF) in Low-Boiling Solvent Hexafluoroisopropanol (HFIP)

Molecules ◽  
2018 ◽  
Vol 23 (8) ◽  
pp. 1866 ◽  
Author(s):  
Sarah Tschirner ◽  
Eric Weingart ◽  
Linda Teevs ◽  
Ulf Prüße
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Reaction System ◽  
Water System ◽  
Catalyst Particle ◽  
Ion Exchange Resin ◽  
Ion Exchange Resins ◽  
Reaction Conditions ◽  
Water As Solvent ◽  
Exchange Resins

A mixture of hexafluoroisopropanol (HFIP) and water was used as a new and unknown monophasic reaction solvent for fructose dehydration in order to produce HMF. HFIP is a low-boiling fluorous alcohol (b.p. 58 °C). Hence, HFIP can be recovered cost efficiently by distillation. Different ion-exchange resins were screened for the HFIP/water system in batch experiments. The best results were obtained for acidic macroporous ion-exchange resins, and high HMF yields up to 70% were achieved. The effects of various reaction conditions like initial fructose concentration, catalyst concentration, water content in HFIP, temperature and influence of the catalyst particle size were evaluated. Up to 76% HMF yield was attained at optimized reaction conditions for high initial fructose concentration of 0.5 M (90 g/L). The ion-exchange resin can simply be recovered by filtration and reused several times. This reaction system with HFIP/water as solvent and the ion-exchange resin Lewatit K2420 as catalyst shows excellent performance for HMF synthesis.

scholarly journals Shape Control of CdTe Nanocrystals: Influence of the Solvent Composition and Ligand Effects

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaoping Jin ◽  
Jürgen Parisi ◽  
Joanna Kolny-Olesiak
Keyword(s):  
Shape Control ◽  
Reaction System ◽  
Solvent Composition ◽  
Injection Solution ◽  
Reaction Conditions ◽  
Injection Method ◽  
Ligand Effects ◽  
Cdte Nanoparticles ◽  
Cdte Nanocrystals ◽  
Hot Injection

CdTe nanocrystals were synthesized by the hot-injection method with a mixture of oleylamine and octadecene as a solvent. The influence of the composition of the solvent and of the injection solution on the shape of CdTe nanoparticles was investigated. Various shapes of CdTe nanocrystals, such as nanodots, nanorods, multipods, and nanowires, could be obtained by changing the reaction conditions. Tuning the reactivity of both the cadmium and the tellurium precursors at the same time was found to be the main reason for the shape control of CdTe nanocrystals in this reaction system. The reactivity of the Cd precursor was controlled by the composition of the solvent, while the activity of the Te precursor could be influenced by using trioctylphosphine and tributylphosphine in the injection solution.

scholarly journals {CoII/III5} horseshoe and {NiII4} lacunary cubane coordination clusters: the isobutyrate/N-butyldiethanolamine reaction system

RSC Advances ◽  
2016 ◽  
Vol 6 (103) ◽  
pp. 100664-100669 ◽  
Author(s):  
Sebastian Schmitz ◽  
Kirill Yu. Monakhov ◽  
Jan van Leusen ◽  
Natalya V. Izarova ◽  
Volkmar Heß ◽  
...  
Keyword(s):  
Reaction System ◽  
Reaction Conditions ◽  
System P

A combination of carboxylate and diethanolamine-type ligands direct the formation of unusual discrete {NiII4} and {CoII/III5} structures under otherwise identical reaction conditions.

Qualitative Identification of Alloys of Precious Metals by Means of Adaptive Changes the Mode Polarization

2016 ◽  
Vol 843 ◽  
pp. 173-177
Author(s):  
S.M. Lipkin ◽  
V.S. Elsukov ◽  
V.I. Lachin
Keyword(s):  
Reaction System ◽  
Precious Metals ◽  
Optimization Method ◽  
Linear Regression Coefficient ◽  
Reaction Conditions ◽  
Adaptive Adjustment ◽  
Optimal Values ◽  
Adjustment System ◽  
Significant Factors

This article is about adaptive adjustment of reaction conditions in local electrochemical rapid analysis. These conditions include in-situ current correction during pulse chronopotentiogram mesuarements. Optimal values of correction parameters were obtained by steep ascent optimization method. Treatment of gold alloys chronopotentiograms was made by the decomposition modeling method. As a result, application of a probe current adjustment system to chronopotentiometry process allows more than 3-time increase in reproducibility of experimental results. The most significant factors in optimizing the parameters of the proposed system are the slope of the linear regression coefficient of the reaction system.

A simple synthetic route to the formation of tetracopper(I) 2-mercaptothiazoline compounds — The crystal structures of [Cu4(S-thiaz)4(PEt2Ph)2], [Cu4(S-thiaz)4(PEt3)2], [Cu4(S-thiaz)4]2, and [Cu4(S-thiaz)4]4

2006 ◽  
Vol 84 (2) ◽  
pp. 251-256 ◽  
Author(s):  
Olaf Fuhr ◽  
Lucia Fernandez-Recio ◽  
Dieter Fenske
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
Copper Complexes ◽  
Synthetic Route ◽  
Reaction Conditions ◽  
One Dimensional ◽  
X Ray ◽  
Tertiary Phosphines ◽  
Oligomeric Compounds

Reactions of copper(I) acetate with 2-mercaptothiazoline (HS-thiaz) in the presence of tertiary phosphines lead to the formation of tetranuclear sulphur-bridged copper complexes. Depending on the reaction conditions, isolated clusters ([Cu4(S-thiaz)4(PR3)2] (PR3 = PPh3 (1), PEt2Ph (2), PEt3 (3)), oligomeric compounds ([Cu4(S-thiaz)4]2 (4) and [Cu4(S-thiaz)4]4 (5)), or a one-dimensional polymer ([Cu4(S-thiaz)4]∞ (6)) are formed. The structures of the compounds 2–5 have been determined by single crystal X-ray analysis.Key words: copper, 2-mercaptothiazoline, single crystal X-ray analysis.

scholarly journals Pulse perturbation technique for determination of piroxicam in pharmaceuticals using an oscillatory reaction system

2013 ◽  
Vol 11 (2) ◽  
pp. 180-188 ◽  
Author(s):  
Nataša Pejić ◽  
Nataša Sarap ◽  
Jelena Maksimović ◽  
Slobodan Anić ◽  
Ljiljana Kolar-Anić
Keyword(s):  
Perturbation Technique ◽  
Kinetic Method ◽  
Reaction System ◽  
Direct Determination ◽  
Pharmaceutical Formulations ◽  
Oscillatory Reaction ◽  
Reaction Conditions ◽  
Good Sample ◽  
Pulse Perturbation

AbstractA simple and reliable novel kinetic method for the determination of piroxicam (PX) was proposed and validated. For quantitative determination of PX, the Bray-Liebhafsky (BL) oscillatory reaction was used in a stable non-equilibrium stationary state close to the bifurcation point. Under the optimized reaction conditions (T = 55.0°C, [H2SO4]0 = 7.60×10−2 mol L−1, [KIO3]0 = 5.90×10−2 mol L−1, [H2O2]0 = 1.50×10−1 mol L−1 and j 0 = 2.95×10−2 min−1), the linear relationship between maximal potential shift ΔE m , and PX concentration was obtained in the concentration range 11.2–480.5 µg mL−1 with a detection limit of 9.9 µg mL−1. The method had a rather good sample throughput of 25 samples h−1 with a precision RSD = 4.7% as well as recoveries RCV ≤ 104.4%. Applicability of the proposed method to the direct determination of piroxicam in different pharmaceutical formulations (tablets, ampoules and gel) was demonstrated.

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