scholarly journals Transition Metal-Ions Incorporated PEG300 and TDI Based Hydroxy-Terminated Polyurethanes

2021 ◽  
Author(s):  
Laxmi ◽  
Adnan Shahzaib ◽  
Shabnam Khan ◽  
Anujit Ghosal ◽  
Fahmina Zafar ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Soft Segment ◽  
Polymeric Materials ◽  
Transition Metal Ions ◽  
Reaction Scheme ◽  
Polymerization Reaction ◽  
Bacterial Strains ◽  
One Pot

Abstract Present work reports the synthesis of polyethylene glycol, PEG 300 (soft segment) and toluene 2,4-diisocyanate, TDI (hard segment) based hydroxy-terminated polyurethane ligands (HTPU300) for the first time to the best of our knowledge. The effect of 3d transition metal ions with different 3d electrons within HTPU (M(II)-HTPU300, M= Mn, Co, Ni, and Zn) was evaluated by their physical and antibacterial studies of the final complex polymeric unit. M(II) HTPU300 and was conveniently synthesized in appreciable yields following a facile and one-pot addition polymerization reaction scheme. Foremost the thermal stability of all the M(II)-HTPU300 polymeric materials were evaluated using TGA, DSC, and IPDT calculations. FTIR technique was used to ascertain the structure of M(II)-HTPU300, while SEM/EDX and XRD techniques were used to study their morphology, elemental analysis, and crystalline nature of the material, respectively. Further, the in-vitro antimicrobial activity of the PU was investigated against gram-positive (Staphylococcus aureus, Bacillus subtilis) and gram-negative (Escherichia coli and Pseudomonas aeruginosa) bacterial strains. The comparatively moderate efficacy against bacterial stain supports the possible application of such PU as thermally stable bacterial resistant materials constructed out of degradable PEG.

Synthesis, Spectral and Antimicrobial Investigation of 2-(Naphthalenel-ylamino)-2- Phenylacetonitrile and 1, 10-Phenanthroline with Five Divalent Transition Metal Ions

2019 ◽  
Vol 10 (01) ◽  
Author(s):  
Mohammed Al-Amery1 ◽  
Ashraf Saad Rasheed ◽  
Dina A. Najeeb
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Transition Metal Ions ◽  
Molar Conductance ◽  
Octahedral Geometry ◽  
Mixed Ligand ◽  
Gram Negative Bacteria ◽  
Magnetic Studies ◽  
Gram Positive Bacteria

Five new mixed ligand metal complexes have been synthesized by the reaction of divalent transition metal ions (Hg, Ni, Zn, Cu and Cd) with 2-(naphthalen-l-ylamino)-2-phenylacetonitrile (L1 ) and 1,10-phenanthroline (L2). The coordination likelihood of the two ligands toward metal ions has been suggested in the light of elemental analysis, UV-Vis spectra, FTIR, 1H-NMR, flam atomic absorption, molar conductance and magnetic studies. Results data suggest that the octahedral geometry for all the prepared complexes. Antibacterial examination of synthesized complexes in vitro was performed against four bacterias. Firstly, Gram-negative bacteria namely, Pseudomonas aerugin and Escherichia. Secondly, Gram-positive bacteria namely, Bacillus subtilis, Staphylococcuaurouss. Results data exhibit that the synthesized complexes exhibited more biological activity than tetracycline pharmaceutical.

Synthesis, Characterization and in vitro Biological Evaluation of a New Schiff Base Derived from Drug and its Complexes with Transition Metal Ions

2018 ◽  
Vol 69 (7) ◽  
pp. 1678-1681
Author(s):  
Amina Mumtaz ◽  
Tariq Mahmud ◽  
M. R. J. Elsegood ◽  
G. W. Weaver
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Ions ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Free Ligand ◽  
Transition Metal Ions ◽  
Biological Evaluation ◽  
Pyridoxal Hydrochloride

New series of copper (II), cobalt (II), zinc (II), nickel (II), manganese (II), iron (II) complexes of a novel Schiff base were prepared by the condensation of sulphadizine and pyridoxal hydrochloride. The ligand and metal complexes were characterized by utilizing different instrumental procedures like microanalysis, thermogravimetric examination and spectroscopy. The integrated ligand and transition metal complexes were screened against various bacteria and fungus. The studies demonstrated the enhanced activity of metal complexes against reported microbes when compared with free ligand.

scholarly journals Synthesis, characterization, chelation with transition metal ions, and antibacterial and antifungal studies of the 4-[(E)- -phenyldiazenyl]-2-[(E)-(phenylimino)methyl]phenol dye

2009 ◽  
Vol 74 (8-9) ◽  
pp. 917-926 ◽  
Author(s):  
Nurcan Kurtoglu
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Complexes ◽  
Micrococcus Luteus ◽  
Free Ligand ◽  
Transition Metal Ions ◽  
Molar Conductance ◽  
Ionic Character ◽  
Rhodotorula Rubra

New Ni(II), Cu(II) and Co(II) complexes were synthesized with the bidentate azo-azomethine dye, 4-[(E)-phenyldiazenyl]-2-[(E)-(phenylimino)methyl] phenol (dmpH), which was prepared by the reaction of 2-hydroxy-5-[(E)- phenyldiazenyl]benzaldehyde with aniline in EtOH. The syntheses of the metal chelates of the azo-azomethine dye were realized by the precipitation technique. The synthesized metal complexes were characterized by elemental analysis, molar conductance measurements, as well as infrared and UV-Vis spectral data. Based on these characterizations, the metal complexes of the transition metal ions may be formulated as [M(dmp)Cl(H2O)] where M = Ni(II), Cu(II) and Co(II). The metal complexes were formed by the coordination of N and O atoms of the ligand. The molar conductance values of the Ni(II), Cu(II) and Co(II) complexes of the bidentate ligand indicate their non-ionic character. The free ligand and its metal complexes were tested for their in vitro antimicrobial properties against eight bacteria: Escherichia coli, Staphylococcus aureus, Klebsiella pneumoniae, Mycobacterium smegmatis, Pseudomonas aeruginosa, Enterococcus cloacae, Bacillus megaterium, and Micrococcus luteus, and three fungi, Kluyveromyces fragilis, Rhodotorula rubra and Saccharomyces cerevisiae, in order to assess their antimicrobial potential. The [Ni(dmp)Cl(H2O)] chelate exhibited high activity against all the bacteria and fungi, except Rhodotorula rubra.

scholarly journals Alleviation of the two-cell block of ICR mouse embryos by polyaminocarboxylate metal chelators

Reproduction ◽  
2002 ◽  
pp. 65-71 ◽  
Author(s):  
T Matsukawa ◽  
S Ikeda ◽  
H Imai ◽  
M Yamada
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Dipicolinic Acid ◽  
Transition Metal Ions ◽  
Mouse Embryos ◽  
Cell Block ◽  
Cell Stage ◽  
Development In Vitro

The present study was undertaken to examine the effects of various transition metal ion chelators, both polyaminocarboxylates (including nitrilotriacetate (NTA), ethylenediaminediacetate (EDDA), ethyleneglycolbistetraacetate (EGTA), ethylenediaminetetraacetate (EDTA) and diethylenetriaminepentaacetate (DTPA)) and non-polyaminocarboxylates (dipicolinic acid and deferoxamine), on the development in vitro of one-cell ICR strain mouse embryos to the four-cell and blastocyst stages. The order of stability constants of polyaminocarboxylates for transition metal ions such as zinc, copper and iron is as follows: NTA < or = EDDA < EGTA < EDTA < DTPA. Addition of 10 or 100 micromol polyaminocarboxylates x l(-1) to the medium significantly enhanced the development of most one-cell embryos (66-88%) beyond the two-cell stage compared with that (< 25%) in medium without polyaminocarboxylates. Although EDDA, EDTA and DTPA at 10 micromol x l(-1) induced the development of most one-cell embryos to the four-cell stage and beyond, a higher concentration (100 micromol x l(-1)) of NTA and EGTA was required to obtain a similar result. Therefore, the ability of polyaminocarboxylates to overcome the two-cell block is not correlated with their potency to chelate transition metal ions. In contrast, the non-polyaminocarboxylates dipicolinic acid and deferoxamine, at 10 and 100 micromol x l(-1), did not have the same effect. Taken together, the results indicate that the ability of polyaminocarboxylates to overcome the two-cell block in embryo development is due to some common feature or features other than the ability to chelate transition metal ions.

A new strategy to construct thermoelectric composites of SWCNTs and poly-Schiff bases with 1,4-diazabuta-1,3-diene structures acting as bidentate-chelating units

2016 ◽  
Vol 4 (29) ◽  
pp. 11299-11306 ◽  
Author(s):  
Caiyan Gao ◽  
Guangming Chen
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Schiff Bases ◽  
Thermoelectric Properties ◽  
Transition Metal Ions ◽  
One Pot ◽  
One Pot Synthesis ◽  
New Strategy

A new strategy has been developed to achieve thermoelectric composites of SWCNTs and poly-Schiff bases, which are obtained via a convenient one-pot synthesis and can chelate transition metal ions to adjust their thermoelectric properties.

HREM Study of electron-induced surface radiation damage in ReO3

1991 ◽  
Vol 49 ◽  
pp. 636-637
Author(s):  
R. Ai ◽  
H.-J. Fan ◽  
L. D. Marks
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Oxides ◽  
Electron Irradiation ◽  
Transition Metal Oxides ◽  
Carbon Film ◽  
Transition Metal Ions ◽  
Surface Radiation ◽  
Valence Transition ◽  
Electron Microscopes

It has been known for a long time that electron irradiation induces damage in maximal valence transition metal oxides such as TiO2, V2O5, and WO3, of which transition metal ions have an empty d-shell. This type of damage is excited by electronic transition and can be explained by the Knoteck-Feibelman mechanism (K-F mechanism). Although the K-F mechanism predicts that no damage should occur in transition metal oxides of which the transition metal ions have a partially filled d-shell, namely submaximal valence transition metal oxides, our recent study on ReO3 shows that submaximal valence transition metal oxides undergo damage during electron irradiation.ReO3 has a nearly cubic structure and contains a single unit in its cell: a = 3.73 Å, and α = 89°34'. TEM specimens were prepared by depositing dry powders onto a holey carbon film supported on a copper grid. Specimens were examined in Hitachi H-9000 and UHV H-9000 electron microscopes both operated at 300 keV accelerating voltage. The electron beam flux was maintained at about 10 A/cm2 during the observation.

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