Studies on the thermal behaviour and decomposition mechanism of complexes of rare earth(III) nitrates with 18-crown-6

Xia

et al. 2017

Chemistry A European J

Construction of a novel matrix with both high conductivity and an excellent confinement effect for polysulfides is of great importance for developing high-performance lithium-sulfur (Li-S) batteries. In this work, we have developed a double-modification strategy to integrate lithium sulfide (Li S) into a conductive composite network consisting of vertical graphene (VG) arrays and an amorphous carbon shell, forming an integrated cathode (VG/Li S-C). Facile liquid-solution/evaporation methods in combination with chemical vapor deposition were successfully adopted for preparation of the above cathode. Due to the enhanced electrical conductivity and noticeable blocking effect for the shuttle of polysulfides, the binder-free flexible VG/Li S-C cathode exhibits high rate performance and reinforced cycles (656.2 mAh g after 100 cycles). The pronounced electrochemical performance is ascribed to the unique architecture with a coherent conductive network of VG and the carbon shell, which not only provides a conductive network for fast reaction kinetics, but also forms a durable protective shield to suppress the shuttle of polysulfides. Our research further demonstrates the synergistic effectiveness by means of inner and outer carbon matrixes for electrochemical enhancement of Li-S batteries.

Section: Introductionmentioning

confidence: 99%

Vertical‐Aligned Li₂S–Graphene Encapsulated within a Carbon Shell as a Free‐Standing Cathode for Lithium–Sulfur Batteries

Xia

et al. 2017

Chemistry A European J

“…The TG-DSC of CuL2 in N2 atmosphere, Figure 10, exhibits TG curve at (190-220) ℃ with loss weight =10% which is associated with the cleavage of coordinated water molecules in the inner-sphere of complex. The second step of TG was shown at (300-320) ℃ range with loss weight=8.5% which is ascribed to break down of weak points of complex like -OCH3 and phenyl groups [42]. As well as the TG curve observed at (400-415) ℃ temperature may be assigned to break down of -Cl and rest organic triazole ring with stable phase of CuO with 55% weight value.…”

Section: Thermo Gravimetric Analysis Of Ligand and Cul2 Complexmentioning

confidence: 84%

“…A second similar volume of di methyl sulfate was added and stirring continued for a greater range of (20 minutes). The temperature will increase to (40)(41)(42)(43)(44)(45) ° C during this second addition. The flask is then fitted with a reflux condenser and the contents are cooked for two hours by stirring.…”

Section: Synthesis Of 345-trimethoxybenzoic Acid (S1)mentioning

confidence: 99%

Synthesis, Characterization and Theoretical Study of Some Transition Metal Complexes with New Schiff Base Derived from 1,2,4-triazole

et al. 2021

The present work involves, new Schiff base of (E)-2- (((3-mercapto-5-(3,4,5-trimethoxyphenyl)-4H-1,2,4-triazol-4yl)imino)methyl)phenol (L2) has been synthesized by condensation reaction of 4-amino-5-(3,4,5 trimethoxy phenyl)-4H-1,2,4triazole-3-thiol with 2-hydroxybenzaldehyde. The new Schiff base (L2) used as a ligand to synthesize a new complex with Co(II), Ni(II), Cu(II), Pd(II), and Cd(II) metal ions by 1:1 (Metal: ligand) ratio. New ligand and their complexes have been exanimated and confirmed by fourier-transform infrared (FT-IR), ultraviolet-visible (UV-visible), proton nuclear magnetic resonance ( 1 HNMR), carbon13 nuclear magnetic resonance ( 13 CNMR), microelement analysis (CHNS), thermal analysis (TG-DSC), atomic absorption flame (AAF), conductivity and magnetic susceptibility. The results obtained from spectra, elemental analyses and thermal analyses (TG-DSC) and compare by density functional theory (DFT) and TD-DFT calculations were screened for some selected complexes and the observed data indicated their stability and the expected chemical formula, Pd(II) were square planner, whereas the Cu(II), Co(II), Ni(II) octahedral, and Cd(II) were tetrahedral geometry . Furthermore, the antibacterial and antifungal activity was screened for the DMSO solution concerning the Schiff base (L2) and its complexes (20 µg/ml) against two kinds of gram; (Staphylococcus aureas and Bacillus subtilis) positive and two negative bacteria; (Esherichia coli and Burkholderia) and against (Candida albican) fungi. The results obtained from diffusion method confirmed the greater activity of Pd(II) and Cd(II) complexes whereas the Co(II),Cu(II) and Ni(II) complexes showed medium activity compared with the low inhibition zones of the free Schiff base of 1, 2, 4-triazole derivative.

“…All the experimental mass losses were in good agreement with the calculated ones as it is shown in Table (4). The second stage is the dissociation and decomposition of the chloride at temperatures depending on bond energies, which results in a temperature range of (100-200) o C. The last mass loss recorded was between the range of (160 -390) o C after that, a region of thermal stability was observed up to more than (800 o C) and was identified as the oxide of the corresponding metal ions which are known to be very stable even at very high temperatures [32][33][34][35].…”

Section: Thermal Analysismentioning

confidence: 96%

Preparation, Characterization and Antibacterial Studies of New 2-(naphthalene-2-yl)-2-(naphthalene-2ylamino) Acetonitrile Ligand with Some Metal Ions

Al-Amery

2016

JNUS

In the present work, the synthesized of a series of metal ions complexes of [Cr(III), Fe(III), Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II)] from new bidentate 2-(naphthalene-2-yl)-2-(naphthalene-2ylamino) acetonitrile ligand (L) which prepared from 2-naphthaldehyde and naphthalene-2-amine in the presence of KCN and alcoholic medium. These compounds were characterized by using several techniques FT-IR, UV-Visible spectrophotometer, magnetic susceptibility, thermal gravimetric analysis (TGA), elemental analysis, molar conductivity, 1 H-NMR, as well as atomic absorption. From the spectral studies, an octahedral monomer structure was proposed for all complexes. The nature of the complexes formed in ethanolic solution has been studied following the molar ratio method and the result recorded [1:2] [M:L] ratio. Some complexes were found to be non-electrolyte and others were found to be weak electrolyte in ethanol. Biological activities of the free ligand and its metal complexes have been tested against a number of microorganisms in order to assess their antimicrobial properties.