Binuclear metal chelate complexes of anthraquinones having a MO4 chromophore. Part 1. Quinizarin

1987 ◽  
Vol 65 (7) ◽  
pp. 1485-1490 ◽  
Author(s):  
M. N. Bakola-Christianopoulou ◽  
P. D. Akrivos ◽  
M. Baumgarten
Keyword(s):  
Metal Ions ◽  
Magnetic Measurements ◽  
Metal Chelate ◽  
Transition Elements ◽  
Chelate Complexes ◽  
Cobalt Nickel ◽  
Oxygen Donor ◽  
Nickel Copper ◽  
Square Planar ◽  
Coordination Spheres

Homobinuclear metal chelate complexes having 1,4-dihydroxy-9,10-anthracenedione (quinizarin) as a bridging unit have been prepared with four bivalent first row transition elements, namely cobalt, nickel, copper, and zinc. The coordination spheres of the metal ions consist of two nearly equivalent six-membered rings with oxygen donor atoms derived from the quinizarin and the terminal ligands which are either β-diketones or salicylic aldehyde. TG, spectroscopic (ir, uv–vis, epr), and magnetic measurements have been applied to an investigation of the geometry adopted by the MO4 chromophores. The results are consistent with varying degrees of distortion from the ideal square planar toward a tetrahedral arrangement around the metal ions, closely related to the specific metal center involved.

Metallkomplexe von N-(Pyrrol-l-yl)salicylaldiminen und deren Strukturbestimmung mittels Röntgendiffraktometrie und Röntgenabsorptionsspektroskopie (XANES) / Metal Chelates of N -(Pyrrol-l-yl)salicylaldim ines and their Structure D eterm ination by X-Ray Structure Analysis and X -R ay Absorption Spectroscopy (XANES)

1996 ◽  
Vol 51 (6) ◽  
pp. 757-764 ◽  
Author(s):  
A. Bach ◽  
L. Beyer ◽  
T. Gelbrich ◽  
K. H. Hallmeier ◽  
C. Hennig ◽  
...  
Keyword(s):  
Structure Analysis ◽  
Absorption Spectroscopy ◽  
Line Shape ◽  
Metal Chelate ◽  
Molecular Structures ◽  
Chelate Complexes ◽  
X Ray ◽  
3D Metals ◽  
Square Planar ◽  
X Ray Absorption

Abstract A series of three N-(pyrrol-l-yl)salicylaldim ines 1-3 has been prepared an d characterized. Their metal chelate complexes with Cu, Ni and Co are described. The molecular structures of bis[N-(pyrrol-l-yl)salicylaldim inato]copper(lI) la, bis{N-[3-(pyrrol-l-yl)propyl]- salicylaldiminato}nickel(II) 2b and tris{N-[3-(pyrrol-l-yl)propyl]salicylaldiminato}cobalt(III) 2d were determined by X-ray structure analysis. The chelates with tetracoordinated copper and nickel show a square planar coordination with the characteristic trans configuration. The chelate with hexacoordinated cobalt has a meridional coordination sphere. The complexes have also been investigated by X-ray absorption spectroscopy (X̲-ray A̲bsorption N̲ear E̲dge S̲tructure, XANES) at the K edges of the 3d metals. Analyzing the relative intensities of the Is → 3d prepeak and the K edges of the line shape, it was possible to distinguish between planar, tetrahedral and octahedral coordination of the chelates

Graphene oxide/cellulose membranes in adsorption of divalent metal ions

RSC Advances ◽  
2016 ◽  
Vol 6 (99) ◽  
pp. 96595-96605 ◽  
Author(s):  
Rafal Sitko ◽  
Marcin Musielak ◽  
Beata Zawisza ◽  
Ewa Talik ◽  
Anna Gagor
Keyword(s):  
Graphene Oxide ◽  
Metal Ions ◽  
Divalent Metal ◽  
Divalent Metal Ions ◽  
Cobalt Nickel ◽  
Nickel Copper ◽  
Zinc Cadmium ◽  
Copper Zinc ◽  
Cellulose Membranes ◽  
Cadmium And Lead

In this paper, graphene oxide/cellulose membranes were prepared in order to perform effective adsorption of heavy metal ions: cobalt, nickel, copper, zinc, cadmium and lead.

scholarly journals Synthesis and Characterization of Phthalic Acid Complexes with Biologically Active Metal Ions

2003 ◽  
Vol 1 (2) ◽  
pp. 7-11
Author(s):  
S. Peter ◽  
M. S. Selvakumar
Keyword(s):  
Metal Ions ◽  
Carboxylic Acids ◽  
Phthalic Acid ◽  
Acid Group ◽  
Biologically Active ◽  
Neutral Medium ◽  
Cobalt Nickel ◽  
Nickel Copper ◽  
Active Metal ◽  
Metabolic Reactions

Animal and plants contain carboxylic acids, which are involved in their metabolic reactions. It is also well known that metal ions are involved in their metabolic reactions. So far the complexation of carboxylate ions with metal ions has been extensively studied. Since neutral or acidic medium is existing in most of the biological reactions in animals and plants it is interesting to study the complexation of organic carboxylic acids in neutral medium with biologically active metal ions such as manganese, cobalt, nickel, copper and zinc. Complexes of phthalic acid were prepared in neutral medium and were characterized. In such complexes the carboxylic acid group is not ionised and carbonyloxygen of the carboxylic acids are coordinated to the metal ions. However the microbial study is not the scope of this work.

scholarly journals Thermal, Spectral, Fluorescence, and Antimicrobial Studies of Cobalt, Nickel, Copper, and Zinc Complexes Derived from 4-[(5-Bromo-thiophen-2-ylmethylene)-amino]-3-mercapto-6-methyl-5-oxo-[1,2,4]triazine

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Kiran Singh ◽  
Yogender Kumar ◽  
Parvesh Puri ◽  
Chetan Sharma ◽  
Kamal Rai Aneja
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Magnetic Measurements ◽  
Analytical Data ◽  
Fluorescence Emission ◽  
Zinc Complexes ◽  
Planar Geometry ◽  
Cobalt Nickel ◽  
Copper And Zinc ◽  
Nickel Copper

A new series of cobalt, nickel, copper, and zinc complexes of bidentate Schiff base derived from the condensation of 5-bromothiophene-2-carboxaldehyde with 4-amino-3-mercapto-6-methyl-5-oxo-[1,2,4]triazine were synthesized. Physical (magnetic measurements, molar conductance, TG), spectral (UV-Vis, IR, 1HNMR, fluorescence, ESR), and analytical data have established the structures of synthesized Schiff base and its metal complexes. The presence of coordinated water in metal complexes was confirmed by IR and TG studies. The Schiff base exhibits a strong fluorescence emission, contrast to this partial fluorescence quenching phenomena is observed in its metal complexes. A square planar geometry for Cu(II) and octahedral geometry for Co(II), Ni(II) and Zn(II) complexes have been proposed. The Schiff base and its metal complexes have been screened for antibacterial (Staphylococcus aureus, Bacillus subtilis, Escherichia coli, Pseudomonas aeruginosa) and antifungal activities (Aspergillus niger, A. flavus).

scholarly journals Solubility and Selectivity Effects of the Anion on the Adsorption of Different Heavy Metal Ions onto Chitosan

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2482 ◽  
Author(s):  
Janek Weißpflog ◽  
Alexander Gündel ◽  
David Vehlow ◽  
Christine Steinbach ◽  
Martin Müller ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Heavy Metal Ions ◽  
Batch Experiments ◽  
Sorption Mechanism ◽  
Iron Cobalt ◽  
Cobalt Nickel ◽  
Adsorption Capacities ◽  
Nickel Copper

The biopolymer chitosan is a very efficient adsorber material for the removal of heavy metal ions from aqueous solutions. Due to the solubility properties of chitosan it can be used as both a liquid adsorber and a solid flocculant for water treatment reaching outstanding adsorption capacities for a number of heavy metal ions. However, the type of anion corresponding to the investigated heavy metal ions has a strong influence on the adsorption capacity and sorption mechanism on chitosan. In this work, the adsorption capacity of the heavy metal ions manganese, iron, cobalt, nickel, copper, and zinc were investigated in dependence on their corresponding anions sulfate, chloride, and nitrate by batch experiments. The selectivity of the different heavy metal ions was analyzed by column experiments.

Interaction of ditertiary phosphines with phenyl- and 1-naphthyldithiocarbamatonickel(II)

1985 ◽  
Vol 50 (6) ◽  
pp. 1383-1390
Author(s):  
Aref A. M. Aly ◽  
Ahmed A. Mohamed ◽  
Mahmoud A. Mousa ◽  
Mohamed El-Shabasy
Keyword(s):  
Thermal Analysis ◽  
Powder Diffraction ◽  
Spin Structure ◽  
Magnetic Measurements ◽  
Mixed Ligand ◽  
Mixed Ligand Complexes ◽  
X Ray ◽  
Square Planar

The synthesis of the following mixed ligand complexes is reported: [Ni(phdtc)2(dpm)2], [Ni(phdtc)2(dpe)2], [Ni(phdtc)2(dpp)3], [Ni(1-naphdtc)2(dpm)2], [Ni(1-naphdtc)2], and [Ni(1-naphdtc)2(dpp)2], where phdtc = PhNHCSS-, 1-naphdtc = 1-NaPhNHCSS-, dpm = Ph2PCH2PPh2, dpe = Ph2P(CH2)2PPh2, and dpp = Ph2P(CH2)3PPh2. The complexes are characterised by microanalysis, IR and UV-Vis spectra, magnetic measurements, conductivity, X-ray powder diffraction, and thermal analysis. All the mixed ligand complexes are diamagnetic, and thus a square-planar or square-pyramidal (low-spin) structure was proposed for the present complexes.

scholarly journals On the Dissolution of Metals in Ionic Liquids 1. Iron, Cobalt, Nickel, Copper, and Zinc

2021 ◽  
Vol 2 (1) ◽  
pp. 63-73
Author(s):  
Jéssica D. S. Vicente ◽  
Domingas C. Miguel ◽  
Afonso M. P. Gonçalves ◽  
Diogo M. Cabrita ◽  
José M. Carretas ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Redox Potential ◽  
Final State ◽  
Iron Cobalt ◽  
Influence Of Temperature ◽  
Dissolution Reaction ◽  
Cobalt Nickel ◽  
Iron Metal ◽  
Copper And Zinc ◽  
Nickel Copper

Ionic liquids are critical reagents for science and technical processes nowadays. Metals are the most used reagents in the industry. It is crucial to have a deeper understanding of how ionic liquids and metals could interact. In this article the interaction of those two families of compounds is accessed. The dissolution (reaction) of metals with ionic liquids is studied, namely the influence of temperature, redox potential, and availability of an oxidant in the process. The final state achieved by the iron metal samples was also addressed by Mössbauer spectroscopy.

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