Liquid-Liquid Distribution of 4-Acyl-3-methyl-1-phenyl-5-pyrazolones and Their Zinc Complexes

The formation of an infinite 1D assembly is governed by the H-bonding interactions in the solid state structure of the two zinc complexes. It has been analyzed energetically using DFT calculations and several computational tools.

Download Full-text

Study on the atomization zones of the nozzle in the processes of material primary processing

Journal of Intelligent & Fuzzy Systems ◽

10.3233/jifs-189604 ◽

2021 ◽

pp. 1-8

Author(s):

Nan Pan ◽

Junbin Qian ◽

Chengjun Zhao

Keyword(s):

Axial Direction ◽

Liquid Distribution ◽

Primary Processing ◽

Nozzle Injection ◽

Injection Zone ◽

Liquid Atomization ◽

Whole Space ◽

Simulation And Experiment ◽

Jet Nozzle ◽

Atomization Zone

It can divide the atomization effect in the direction of the nozzle axial injection into the jet area and the non-jet area by using the second crushing theory. On this basis, according to the feed liquid atomization particles discrete degree index of characteristics particle size of feed liquid atomization, it divides the injection zone into the atomization area and the diffusion area, so as to realize the axial direction of jet nozzle injection zone, atomization zone and the diffusion zone accurately. Simulation and experiment are used to verify the three zones of atomization nozzle. The division of three zones drives the study from the whole space of liquid distribution in the roller to atomization zone, clears the key zone of the roller in tobacco primary processing, and provides a basis for further work.

Download Full-text

Thermally activated delayed fluorescence and phosphorescence quenching in iminophosphonamide copper and zinc complexes

Chemistry - A European Journal ◽

10.1002/chem.202101247 ◽

2021 ◽

Author(s):

Peter Werner Roesky ◽

Bhupendra Goswami ◽

Thomas J. Feuerstein ◽

Ravi Yadav ◽

Sergei Lebedkin ◽

...

Keyword(s):

Delayed Fluorescence ◽

Zinc Complexes ◽

Thermally Activated Delayed Fluorescence ◽

Phosphorescence Quenching ◽

Thermally Activated ◽

Copper And Zinc ◽

Fluorescence And Phosphorescence

Download Full-text

Synthesis of the Bacteriostatic Poly(L-Lactide) by Using Zinc (II)[(acac)(L)H2O] (L = Aminoacid-Based Chelate Ligands) as an Effective ROP Initiator

International Journal of Molecular Sciences ◽

10.3390/ijms22136950 ◽

2021 ◽

Vol 22 (13) ◽

pp. 6950

Author(s):

Renata Barczyńska-Felusiak ◽

Małgorzata Pastusiak ◽

Piotr Rychter ◽

Bożena Kaczmarczyk ◽

Michał Sobota ◽

...

Keyword(s):

Schiff Bases ◽

Antibacterial Properties ◽

Antimicrobial Effect ◽

Zinc Complexes ◽

Antibacterial And Antifungal Activities ◽

Aspergillus Brasiliensis ◽

Acetylacetonate Complex ◽

Distorted Trigonal Bipyramid ◽

Composition Structure ◽

Antibacterial And Antifungal

The paper presents a synthesis of poly(l-lactide) with bacteriostatic properties. This polymer was obtained by ring-opening polymerization of the lactide initiated by selected low-toxic zinc complexes, Zn[(acac)(L)H2O], where L represents N-(pyridin-4-ylmethylene) tryptophan or N-(2-pyridin-4-ylethylidene) phenylalanine. These complexes were obtained by reaction of Zn[(acac)2 H2O] and Schiff bases, , the products of the condensation of amino acids and 4-pyridinecarboxaldehyde. The composition, structure, and geometry of the synthesized complexes were determined by NMR and FTIR spectroscopy, elemental analysis, and molecular modeling. Both complexes showed the geometry of a distorted trigonal bipyramid. The antibacterial and antifungal activities of both complexes were found to be much stronger than those of the primary Schiff bases. The present study showed a higher efficiency of polymerization when initiated by the obtained zinc complexes than when initiated by the zinc(II) acetylacetonate complex. The synthesized polylactide showed antibacterial properties, especially the product obtained by polymerization initiated by a zinc(II) complex with a ligand based on l-phenylalanine. The polylactide showed a particularly strong antimicrobial effect against Pseudomonas aeruginosa, Staphylococcus aureus, and Aspergillus brasiliensis. At the same time, this polymer does not exhibit fibroblast cytotoxicity.

Download Full-text

Ring-Opening Copolymerization of Cyclohexene Oxide and Cyclic Anhydrides Catalyzed by Bimetallic Scorpionate Zinc Catalysts

Polymers ◽

10.3390/polym13101651 ◽

2021 ◽

Vol 13 (10) ◽

pp. 1651

Author(s):

Felipe de la Cruz-Martínez ◽

Marc Martínez de Sarasa Buchaca ◽

Almudena del Campo-Balguerías ◽

Juan Fernández-Baeza ◽

Luis F. Sánchez-Barba ◽

...

Keyword(s):

Catalytic Activity ◽

Reaction Mechanism ◽

Catalytic System ◽

Phthalic Anhydride ◽

Ring Opening ◽

High Selectivity ◽

Zinc Complexes ◽

Cyclohexene Oxide ◽

Reaction Conditions ◽

Cyclic Anhydrides

The catalytic activity and high selectivity reported by bimetallic heteroscorpionate acetate zinc complexes in ring-opening copolymerization (ROCOP) reactions involving CO2 as substrate encouraged us to expand their use as catalysts for ROCOP of cyclohexene oxide (CHO) and cyclic anhydrides. Among the catalysts tested for the ROCOP of CHO and phthalic anhydride at different reaction conditions, the most active catalytic system was the combination of complex 3 with bis(triphenylphosphine)iminium as cocatalyst in toluene at 80 °C. Once the optimal catalytic system was determined, the scope in terms of other cyclic anhydrides was broadened. The catalytic system was capable of copolymerizing selectively and efficiently CHO with phthalic, maleic, succinic and naphthalic anhydrides to afford the corresponding polyester materials. The polyesters obtained were characterized by spectroscopic, spectrometric, and calorimetric techniques. Finally, the reaction mechanism of the catalytic system was proposed based on stoichiometric reactions.

Download Full-text