Neutral and anionic zinc compounds supported by a bis(imino)phenyl NCN ligand

2018 ◽  
Vol 47 (13) ◽  
pp. 4607-4612 ◽  
Author(s):  
Minh Tho Nguyen ◽  
Bulat Gabidullin ◽  
Georgii I. Nikonov
Keyword(s):  
Zinc Complexes ◽  
Pincer Ligand ◽  
Zinc Compounds

The new zinc complexes 2,6-(ArNCH)2C6H3ZnBu (6) and 2,6-(ArNCH)2C6H3ZnCl2Li(THF)3 (7), supported by a bis(imino)phenyl NCN pincer ligand, were prepared (Ar = 2,6-iPr2C6H3).

Coordination Chemistry and Reactivity of Zinc Complexes Supported by a Phosphido Pincer Ligand

2012 ◽  
Vol 18 (8) ◽  
pp. 2349-2360 ◽  
Author(s):  
Ilaria D'Auria ◽  
Marina Lamberti ◽  
Mina Mazzeo ◽  
Stefano Milione ◽  
Giuseppina Roviello ◽  
...  
Keyword(s):  
Coordination Chemistry ◽  
Zinc Complexes ◽  
Pincer Ligand

scholarly journals Bimetallic iron–iron and iron–zinc complexes of the redox-active ONO pincer ligand

2016 ◽  
Vol 7 (2) ◽  
pp. 1594-1599 ◽  
Author(s):  
Janice L. Wong ◽  
Robert F. Higgins ◽  
Indrani Bhowmick ◽  
David Xi Cao ◽  
Géza Szigethy ◽  
...  
Keyword(s):  
Zinc Complexes ◽  
Magnetic Studies ◽  
Pincer Ligand ◽  
Heterobimetallic Complexes ◽  
Redox Active ◽  
Iron Iron

Synthetic and magnetic studies of homo- and heterobimetallic complexes of the redox-active ONO pincer ligand.

scholarly journals Zinc(II) Complexes of Amino Acids as New Active Ingredients for Anti-Acne Dermatological Preparations

2021 ◽  
Vol 22 (4) ◽  
pp. 1641
Author(s):  
Michał Abendrot ◽  
Elżbieta Płuciennik ◽  
Aleksandra Felczak ◽  
Katarzyna Zawadzka ◽  
Ewelina Piątczak ◽  
...  
Keyword(s):  
Zinc Complexes ◽  
Active Ingredients ◽  
Zinc Compounds ◽  
Skin Cells ◽  
High Antibacterial Activity ◽  
Physicochemical Stability ◽  
Cutibacterium Acnes ◽  
Keratinocyte Cell ◽  
Low Cytotoxicity ◽  
The Stability

Zinc compounds have a number of beneficial properties for the skin, including antimicrobial, sebostatic and demulcent activities. The aim of the study was to develop new anti-acne preparations containing zinc–amino acid complexes as active ingredients. Firstly, the cytotoxicity of the zinc complexes was evaluated against human skin fibroblasts (1BR.3.N cell line) and human epidermal keratinocyte cell lines, and their antimicrobial activity was determined against Cutibacterium acnes. Then, zinc complexes of glycine and histidine were selected to create original gel formulations. The stability (by measuring pH, density and viscosity), microbiological purity (referring to PN-EN ISO standards) and efficacy of the preservative system (according to Ph. Eur. 10 methodology) for the preparations were evaluated. Skin tolerance was determined in a group of 25 healthy volunteers by the patch test. The preparations containing zinc(II) complexes with glycine and histidine as active substances can be topically used in the treatment of acne skin due to their high antibacterial activity against C. acnes and low cytotoxicity for the skin cells. Dermatological recipes have been appropriately composed; no irritation or allergy was observed, and the preparations showed high microbiological purity and physicochemical stability.

Effect of Hydrated Metal Salts on the Coordination Product of Cobalt(II) halide and PNP Type Ligand, 2,6-bis(di-tertbutylphosphinomethyl) pyridine

2018 ◽  
Author(s):  
Tasneem Siddiquee ◽  
Abdul Goni
Keyword(s):  
Metal Salts ◽  
Molar Ratio ◽  
Pincer Complexes ◽  
Asymmetric Unit ◽  
X Ray Diffraction ◽  
Pincer Ligand ◽  
Tetrahedral Geometry ◽  
X Ray ◽  
Distorted Tetrahedral Geometry ◽  
Cobalt Center

Chemical treatment of CoX<sub>2</sub><b><sup>. </sup></b>6H<sub>2</sub>O (X = Cl, Br, I) with the potentially tridentate PNP pincer ligand 2,6-bis(di-<i>tert</i>-butylphosphinomethyl)pyridine in 1:1 molar ratio results in cobalt(II) halide-PNP pincer complexes. The effect of the hydrated metal source on molecular structure and geometry of the complexes was studied by single crystal X-ray diffraction analysis. The complexes are neutral and the cobalt center adopts a penta-coordinate system with potential atropisomerization. Within the unit cell there are two distinct molecules per asymmetric unit. One of the two phosphorus atoms in the PNP ligand was observed to be partially oxidized to phosphinoxide. Disorder in the structure reflects a mixture of square pyramidal and distorted tetrahedral geometry.

ZINC IN THE RATIONS OF CALVES

2019 ◽  
Keyword(s):  
Body Mass ◽  
Test Group ◽  
Hair Follicles ◽  
Control Group ◽  
Albumin Concentration ◽  
Zinc Compounds ◽  
Entire Duration ◽  
Zinc Salts ◽  
Group A ◽  
Hair Cortex

According to the Tambovagrochemcenter data, zinc deficiency in animal rations exceeds 33%. To de-termine the efficiency of ration additives 3 groups of calves were formed, one of which was control and received regular feed, first test group received additional Zinc Sulphate, and second test group received additional Zinc Bioplex. To assess the results, we take into account the following values: chemical com-position and nutritional values of the feed, body mass value, amount of immunoglobulins in blood, bio-chemical and hematological values of blood, morphological values of fur and skin. Noticeable results were achieved in 4 months, with first and second test groups receiving accordingly 3,15% and 6,13% more body mass increase over the control group. A tendency towards higher albumin concentration in both test groups was noted, and calves of the second test group had higher amounts of hemoglobin and higher concentrations of it per erythrocyte. In samples of epidermis and hairs of the second test group the papillary layer was well developed, with the amount of hair and hair follicles exceeding 7 in the field of view, with the thickness of hairs being at least 70 μm. Inner papilla of hair contained 6 to 8 layers of hair, thickness of awn hairs reaching 80-90 μm, down hairs reaching 40 μm, with the hair cortex making up more than 80% of the hair thickness. Thus, introducing zinc salts and chelated zinc compounds to the milk-fed calves’ ration, has resulted in monetary profit increases over the control group by 255,0 and 612,0 roubles accordingly. By all researched values, the highest results were reached from adding zinc bioplex with approximately 360 mg added per animal for the entire duration of the growth process.

Zinc Complexes with an Ethylene-Bridged Bis(β-diketiminate) Ligand: Syntheses, Structures, and Applications as Catalysts in the Borylation of Aryl Iodides

2021 ◽  
Vol 40 (4) ◽  
pp. 482-489
Author(s):  
Yafei Li ◽  
Yan Dang ◽  
Dawei Li ◽  
Huifen Pan ◽  
Liang Zhang ◽  
...  
Keyword(s):  
Zinc Complexes ◽  
Aryl Iodides

Insight into the formation of H-bonds propagating the monomeric zinc complexes of a tridentate reduced Schiff base to form an infinite chain

CrystEngComm ◽  
2021 ◽  
Author(s):  
Mainak Karmakar ◽  
Antonio Frontera ◽  
Shouvik Chattopadhyay
Keyword(s):  
Schiff Base ◽  
Solid State ◽  
Dft Calculations ◽  
Zinc Complexes ◽  
Infinite Chain ◽  
State Structure ◽  
Computational Tools ◽  
Solid State Structure ◽  
Reduced Schiff Base ◽  
Insight Into

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.

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