scholarly journals SYNTHESIS, CHARACTERIZATION AND ANTIBACTERIAL STUDIES ON DIVALENT TRANSITION METAL COMPLEXES OF HYDRAZINE WITH ARYL SUBSTITUTED ACETIC ACIDS

2015 ◽  
Vol 2 (1) ◽  
pp. 18-23
Author(s):  
Manimekalai R ◽  
Kalpanadevi K ◽  
Anjutha Prabha N ◽  
Raina O
Keyword(s):  
Metal Ion ◽  
Thermal Analyses ◽  
Thermal Studies ◽  
Single Step ◽  
Infrared Spectral ◽  
Dta Curves ◽  
Final Residue ◽  
Monodentate Coordination ◽  
Composition Of Complexes ◽  
Acetic Acids

Metal phenylacetate Sesquihydrazinate hydrates of the formula M(PhAc)2.1.5N2H4.H2O where M=Co,Ni or Cd and Metal phenoxyacetate Sesquihydrazinate hydrates M(PhOAc)2.1.5N2H4.H2O Where M=Co, Ni , Cd or Mn have been prepared and characterized by analytical, IR spectral and thermal studies. The composition of complexes have been determined by analytical studies. Infrared spectral data indicate that the bidentate bridging by hydrazine molecules and monodentate coordination by carboxylate ions to the cental metal ion. Thermogravimetry (TG) and differential thermal analyses (DTA) in air have been used to study the thermal behaviour of the complexes. The simultaneous TG-DTA curves of all the complexes in air resultedin the formation of respective metal or metal oxide as final residue. These complexes decompose exothermically either in single step or decompose through respective metal carboxylate intermediates. The antibacterial activity of the prepared complexes screened against Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa and Proteus mirabilis

scholarly journals Synthetic, Spectral and Thermal Studies of Tin(IV) Complexes of 1, 5-Benzodiazepines

2008 ◽  
Vol 5 (3) ◽  
pp. 627-633 ◽  
Author(s):  
Suresh ◽  
Padaki Srinivas ◽  
T. Suresh ◽  
M. Revanasiddappa ◽  
Syed Khasim
Keyword(s):  
Metal Ion ◽  
Thermal Studies ◽  
Molar Conductance ◽  
Information Support ◽  
X Ray Diffraction ◽  
Cubic Crystal ◽  
Alcoholic Medium ◽  
X Ray ◽  
Simple Cubic ◽  
Infrared Spectral

Tin(IV) complexes of 7-substituted 6,7-benzo-1,5-dizepines have been synthesized in absolute alcoholic medium. Elemental analysis indicates that the complexes have 1:2 stoichiometry of the type L2SnCl4, TGA data support this conclusion. Molar conductance values in DMF at 10–3 M suggest that, these complexes are non-electrolytes. Infrared spectral data shows the involvement of C=N and NH groups in coordination with the metal ion. X-ray diffraction pattern of few representative complexes indicate that, these are having simple cubic crystal structure. The energy of activation and order of reaction are calculated using TGA data of the complexes. All these information support that Sn(IV) in these complexes exhibits coordination number eight.

scholarly journals Transition metal M(II) complexes with isonicotinoylhydrazone-9-anthraldehyde

2010 ◽  
Vol 75 (11) ◽  
pp. 1515-1531 ◽  
Author(s):  
M.L. Dianu ◽  
A. Kriza ◽  
N. Stanica ◽  
A.M. Musuc
Keyword(s):  
Thermal Analyses ◽  
Thermal Studies ◽  
Octahedral Geometry ◽  
Spectral Studies ◽  
Conductivity Measurements ◽  
Tetrahedral Geometry ◽  
Physico Chemical ◽  
Pyridine Nitrogen ◽  
Infrared Spectral ◽  
Nitrate Complexes

New complexes of isonicotinoylhydrazone-9-anthraldehyde with Cu(II), Co(II) and Ni(II) have been prepared and characterized by analytical and physico-chemical techniques, such as elemental and thermal analyses, magnetic susceptibility and conductivity measurements, and electronic, EPR and IR spectral studies. The infrared spectral studies revealed the bidentate or monodentate nature of the Schiff base in the complexes; the pyridine nitrogen does not participate in the coordination. A tetrahedral geometry is suggested for the nitrate-complexes and an octahedral geometry for the others. Thermal studies support the chemical formulation of these complexes.

scholarly journals A Photochemical Strategy for Carbon Isotope Exchange with CO2

2020 ◽  
Author(s):  
Victor Babin ◽  
Alex Talbot ◽  
Alexandre Labiche ◽  
Gianluca Destro ◽  
Antonio Del Vecchio ◽  
...  
Keyword(s):  
Carbon Isotope ◽  
Isotope Exchange ◽  
Thermal Conditions ◽  
Single Step ◽  
Structural Modifications ◽  
Mild Conditions ◽  
Stark Contrast ◽  
Acetic Acids

A novel photocatalytic approach for carbon isotope exchange is reported. Utilizing [<sup>13</sup>C]CO<sub>2</sub> as primary C1 sources, this protocol allows the insertion of the desired carbon isotope into phenyl acetic acids without the need of structural modifications or pre-functionalization, in one single step. The exceptionally mild conditions required for this traceless transformation are in stark contrast with previous methods requiring the use of harsh thermal conditions.

scholarly journals Spirolactam capped cyanine dyes for designing NIR probes to target multiple metal ions

RSC Advances ◽  
2017 ◽  
Vol 7 (40) ◽  
pp. 24970-24980 ◽  
Author(s):  
Chirantan Kar ◽  
Yutaka Shindo ◽  
Kotaro Oka ◽  
Shigeru Nishiyama ◽  
Koji Suzuki ◽  
...  
Keyword(s):  
Metal Ions ◽  
Spectral Region ◽  
Metal Ion ◽  
Near Infrared ◽  
Cyanine Dyes ◽  
Infrared Spectral Region ◽  
Turn On ◽  
Infrared Spectral ◽  
Fluorescence Turn On

This work reports cyanine based spirocyclic metal ion probes, showing a fluorescence turn-on response to various metal ions in the near-infrared spectral region.

Preparation, ion-exchange, and electrochemical behavior of Cs-type manganese oxides with a novel hexagonal-like morphology

2007 ◽  
Vol 22 (9) ◽  
pp. 2437-2447 ◽  
Author(s):  
Zong-Huai Liu ◽  
Liping Kang ◽  
Mingzhu Zhao ◽  
Kenta Ooi
Keyword(s):  
Ion Exchange ◽  
Alkali Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Manganese Oxides ◽  
Thermal Analyses ◽  
Alkali Metal Ions ◽  
Ph Titration ◽  
High Discharge Capacity ◽  
Treated Sample

Cs-type layered manganese oxide with a novel hexagonal-like morphology (Cs–BirMO) was prepared by a solid-state reaction procedure. The Cs+ extraction and alkali–metal ion insertion reactions were investigated by chemical analyses, x-ray analyses, scanning electron microscopy observation, Fourier transform-infrared spectroscopy, thermogravimetric differential thermal analyses, pH titration, and distribution coefficient (Kd) measurements. A considerable percentage (88%) of Cs+ ions in the interlayer sites were topotactically extracted by acid treatment, accompanied by a slight change of the lattice parameters. Alkali–metal ions could be inserted into the interlayer of the acid-treated sample (H–BirMO), mainly by an ion-exchange mechanism. The pH titration curve of the H–BirMO sample showed a simple monobasic acid toward Li+, Rb+, and Cs+ ions, and dibasic acid behavior toward Na+ and K+ ions. The order of the apparent capacity was K+ > Li+ ≈ Na+ ≈ Rb+ ≈ Cs+ at pH < 6. The Kd study showed the selectivity sequence of K+ > Rb+ > Na+ > Li+ for alkali–metal ions at the range of pH <5; H–BirMO sample showed markedly high selectivity for the adsorption of K+ ions. Preliminary investigations of the electrochemical properties of the Li+-inserted sample Li–BirMO(1M, 6d) showed that the obtained samples had a relatively high discharge capacity of 115 mAh g−1 and excellent layered stability.

Metal Halide Ammines. III. Thermal Analyses and Calorimetry of Fluorosilicate Ammines and Hydrates of Bivalent Metals. Infrared Spectra of the Ammines

1975 ◽  
Vol 53 (16) ◽  
pp. 2426-2429 ◽  
Author(s):  
Kashinath C. Patil ◽  
Etalo A. Secco
Keyword(s):  
Spectral Data ◽  
Infrared Spectra ◽  
Thermal Analyses ◽  
Calorimetric Data ◽  
Ammonia Loss ◽  
Bivalent Metal ◽  
Decomposition Reactions ◽  
Infrared Spectral ◽  
Bivalent Metals ◽  
And Calorimetry

Bivalent metal fluorosilicate ammines have been prepared. The thermal analyses of the dodecammines reveal the decomposition to occur via the pentammine and/or tetrammine. The final ammonia loss is concomitant with fluorosilicate decomposition. Calorimetric data are given for the decomposition reactions. Some fluorosilicate hydrates are included for comparison purposes.The infrared spectral data of the ammines are presented with their assignments.

A convenient single step synthesis of p -thiomethylmethylcalixarenes and metal ion extraction studies

Tetrahedron ◽  
2003 ◽  
Vol 59 (38) ◽  
pp. 7481-7484 ◽  
Author(s):  
Satish Kumar ◽  
H.M Chawla ◽  
R Varadarajan
Keyword(s):  
Metal Ion ◽  
Single Step ◽  
Metal Ion Extraction ◽  
Ion Extraction

scholarly journals Thermal Decomposition Studies of Layered Metal Hydroxynitrates (Metal: Cu, Zn, Cu/Co, and Zn/Co)

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Thimmasandra Narayan Ramesh ◽  
Theeta Lakshamaiah Madhu
Keyword(s):  
Metal Ion ◽  
Structural Transformations ◽  
Single Step ◽  
Cobalt Metal ◽  
Isothermal Decomposition ◽  
Metal Hydroxides ◽  
X Ray ◽  
Metal Nitrates ◽  
Biphasic Mixture ◽  
Hydrolysis Of

Layered metal hydroxynitrates and mixed metal hydroxynitrates (copper/cobalt hydroxynitrates and zinc/cobalt hydroxynitrates at different mole ratios) were synthesized by hydrolysis of urea and metal nitrates at 140°C. Layered metal hydroxyl nitrates derive their structure from brucite mineral and generally crystallize in hexagonal and monoclinic phases. Isothermal decomposition studies of Cu2(OH)3(NO3), Co2(OH)3(NO3), Cu1.5Co0.5(OH)3(NO3), Cu1.34Co0.66(OH)3(NO3), Zn5(OH)8(NO3)2(H2O)2, Zn3.75Co1.25(OH)8(NO3)2(H2O)2, and Zn3.35Co1.65(OH)8(NO3)2(H2O)2 samples were carried out at different intervals of temperature and the structural transformations during the process were monitored using powder X-ray diffractograms. Biphasic mixture of metal hydroxynitrate/metal oxide is observed in case of cobalt/zinc based layered hydroxynitrates, while copper hydroxynitrate or copper/cobalt metal hydroxynitrate decomposes in a single step. The decomposition temperatures of layered metal hydroxynitrates and mixed layered metal hydroxides depend on the method of preparation, their composition and the nature of metal ion, and their coordination.

scholarly journals Synthesis, spectroscopic and thermogravimetric interpretations of UO2(II), ZrO(II), Zr(IV), VO(II) and V(V) ciprofloxacin antibiotic drug complexes

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Lamia A. Albedair
Keyword(s):  
Metal Ion ◽  
Thermal Studies ◽  
Analysis Data ◽  
Molar Conductance ◽  
Water Molecules ◽  
Transmission Electron ◽  
Antibiotic Drug ◽  
Electrolytic Properties ◽  
Diamagnetic Behavior ◽  
Coordinated Water

Abstract New five ciprofloxacin (CIP) complexes of dioxouranium(II), oxozirconium(II), zirconium(IV), oxovanadium(II) and vanadium(IV) in the proportion 1:2 have been prepared using CIP as a drug chelate with UO2(NO3)2. 6H2O, ZrOCl2. 8H2O, ZrCl4, VOSO4. xH2O and V2O5 respectively. The CIP complexes have been characterized based on the elemental analysis, molar conductance, magnetic, (FTIR & 1HNMR) spectral and thermal studies. The molar conductance studies of the synthesized complexes in DMSO solvent with concentration of 10–3 M indicate their non-electrolytic properties. At room temperature, the magnetic moment measurements revealed a diamagnetic behavior for all CIP prepared complexes. The different formulas of the new complexes can be represented as [UO2(CIP)2(NO3)2] (I), [VO(CIP)2(SO4)(H2O)] (II), [V2(O)(O2)2(CIP)2] (III), [Zr(O)(CIP)2(Cl)2] (IV), and [Zr(CIP)2(Cl)4] (V). The thermal analysis data of the complexes indicates the absence of coordinated water molecules except for vanadyl(II) complex (II). The CIP chelate is a uni-dentate ligand coordinated to the mentioned metal ion through terminal piperazinyl nitrogen. The transmission electron microscopy (TEM) investigation confirms the nano-structured form of the complexes.

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