scholarly journals Synthesis and Spectral Studies of Co(II),Ni(II),Zn(II) and Cd(II) Complexes with Ligand 2-[4- Carboxy methyl phenyl azo] -4,5-diphenyl imidazole (4CMeI)

2013 ◽  
Vol 10 (2) ◽  
pp. 420-431
Author(s):  
Baghdad Science Journal
Keyword(s):  
Metal Ions ◽  
Spectroscopic Studies ◽  
Ratio Method ◽  
Spectral Studies ◽  
Geometrical Structures ◽  
Visible Spectra ◽  
Mole Ratio Method ◽  
Complex Solutions ◽  
Carboxy Methyl ◽  
Methyl Phenyl

A new chelate complexes of Co(II),Ni(II),Zn(II) and Cd(II) were prepared by reacting these ions with the ligand 2-[4- Carboxy methyl phenyl azo]-4,5-diphenyl imidazole (4CMeI) The preparation were conducted after fixing the optimum conditions such as (pH) and concentration .UV- visible spectra of these complex solutions were studied for a range of (pH) and concentration which obey lampert-Beers Law.The structures of complexes were deduced according to mole ratio method which were obtained from the spectroscopic studies of the complex solutions .The ratios of metal: ligand obtained were (1:2) for all complexes..(UV-Vis) absorption spectra and The infrared spectra of the chelating complexes were studied ,this may indicate that coordination between the metal ions and our ligand takes place.The conductivity measurements , elemental analysis ,the percentage of some metal ions and the measurements of magnetic susceptibility of the complexes were determined ,Depending on these results , in addition to, We may conclude that the ligand was bidentate Also the proposed geometrical structures of the complexes of Co(II), Ni(II), Zn(II) and Cd (II) ions are octahedral

Raman Spectral Studies of Cadmium–Nitrite Interactions in Aqueous Solutions and Crystals

1975 ◽  
Vol 53 (10) ◽  
pp. 1414-1423 ◽  
Author(s):  
Donald E. Irish ◽  
Roderick V. Thorpe
Keyword(s):  
Aqueous Solutions ◽  
High Frequency ◽  
Deformation Mode ◽  
Formation Constants ◽  
Ratio Method ◽  
Spectral Studies ◽  
Nitrite Concentration ◽  
Nitrite Ion ◽  
Mole Ratio Method ◽  
Raman Spectral

Raman spectra of aqueous solutions containing Cd2+ and NO2− clearly reveal the presence of solvated nitrite ion and of complexes. A band at 861 cm−1 is characteristic of the latter. The free nitrite concentration was measured from the intensity of the 817 cm−1 line and the average ligand number was evaluated for solutions with composition prescribed by the mole-ratio method. Four cumulative formation constants were deduced: β1 = 61.6; β2 = 993; β3 = 2390; β4 = 1899. Evidence that nitrite chelates Cd2+ through the two oxygen atoms is presented. The diagnostic spectral evidence consists of a high intensity, high frequency deformation mode and low intensity N—O stretching Raman bands with frequencies almost identical to those of the solvated nitrite ion. Data are also presented for solid Cd(NO2)2 and Kx−2Cd(NO2)x(x = 3,4,5).

Investigation of Substitution Reactions Between Zinc(II) Complexes with Different Geometries and N-bonding Nucleophiles

2021 ◽  
Vol 01 ◽  
Author(s):  
Tanja Soldatović ◽  
Enisa Selimović
Keyword(s):  
Anticancer Drugs ◽  
Complex Anion ◽  
Kinetic Method ◽  
Point Of View ◽  
Octahedral Complex ◽  
Ratio Method ◽  
Reaction Step ◽  
Geometrical Structures ◽  
Nitrogen Donor ◽  
Mole Ratio Method

Aims: Investigation of interactions between zinc(II) complexes with different geometrical structures and relevant nitrogen donor nucleophiles at physiological pH. Background: The lack of clear distinction between the therapeutic and toxic doses of platinum drugs is a major challenge for the design of novel non-platinum DNA and protein targeting metal-based anticancer agents. The non-platinum antitumor complexes could be alternatives to platinum-based drugs due to their better characteristics and different mechanism of action. Objective This study could provide more information for the design of future zinc-based anticancer drugs, as well as providing a better understanding of the mechanism of interactions between Zn(II) complexes and nitrogen-donor nucleophiles (important from a medical point of view) and clarifies the changes in geometrical structures of zinc(II) that are referred to structure-reactivity correlation Methods Mole-ratio method and UV-Vis spectroscopic kinetic method were applied in this study. Objective : This study could provide more information for the design of future zinc-based anticancer drugs, as well as providing a better understanding of the mechanism of interactions between Zn(II) complexes and nitrogen-donor nucleophiles (important from a medical point of view) and clarifies the changes in geometrical structures of zinc(II) that are referred to structure-reactivity correlation Methods Mole-ratio method and UV-Vis spectroscopic kinetic method were applied in this study. Result: The results indicated additional coordination of chlorides in the first coordination sphere with changes in coordination geometry and formation of the octahedral complex anion [ZnCl4(en)]2- while an excess of chloride didn’t affect the square-pyramidal structure of [ZnCl2(terpy)]. The substitutions of studied complexes and relevant nucleophiles proceed in two consecutive reaction steps that depend on the nucleophile concentration. Octahedral complex anion [ZnCl4(en)]2- forms rapidly, and all substitution processes of this complex species should be considered. We assume that the first reaction step is accompanied by the dissociation of chloride ligands. Nucleophile 1,2,4-triazole have shown the highest affinity toward [ZnCl2(en)], and rates of both steps are almost the same value, which indicates parallel reactions. Conclusion: The different order of reactivity of relevant N-donor ligands toward [ZnCl2(en)] and [ZnCl2(terpy)] complexes for the first reaction step occurred due to the influence of different geometrical structures of complexes. In contrast, low reaction rates for the second reactions of [ZnCl2(en)] complex with imidazole and pyrazine were a consequence of interconversion between octahedral and tetrahedral structure during substitution processes.

scholarly journals A NEW PHENOLIC COMPOUND FROM ACETONE EXTRACT OF LICHEN Usnea flexuosa Tayl.

2011 ◽  
Vol 11 (3) ◽  
pp. 290-294
Author(s):  
Maulidiyah Maulidiyah ◽  
A. Herry Cahyana ◽  
Wahyudi Priyono Suwarso
Keyword(s):  
Natural Product ◽  
Phenolic Compound ◽  
Usnic Acid ◽  
Spectroscopic Studies ◽  
Acetone Extract ◽  
Methyl Phenyl

Natural product, 2'-hydroxy-1'-(4-hydroxyl-5-methoxy-2-methyl-phenyl)-ethanon, (1), was isolated from the thalli lichen Usnea flexuosa Tayl. together with the known (-) - usnic acid (2). The structure of compounds 1 and 2 were determined by the spectroscopic studies.

scholarly journals Spectroscopic studies on the potassium 1-fluorobenzoyltrifluoroborate salt by using the FT-IR, Raman and UV–Visible spectra and DFT calculations

2020 ◽  
Vol 1204 ◽  
pp. 127534 ◽  
Author(s):  
Maximiliano A. Iramain ◽  
Ana E. Ledesma ◽  
Elizabeth Imbarack ◽  
Patricio Leyton Bongiorno ◽  
Silvia Antonia Brandán
Keyword(s):  
Dft Calculations ◽  
Spectroscopic Studies ◽  
Visible Spectra ◽  
Ft Ir ◽  
Uv Visible

Magnetophoretic mole-ratio method in solvent extraction systems

2020 ◽  
Vol 1111 ◽  
pp. 60-66
Author(s):  
Hitoshi Watarai ◽  
Mariko Kurahashi
Keyword(s):  
Solvent Extraction ◽  
Ratio Method ◽  
Mole Ratio Method

scholarly journals Organoruthenium(II) thiosemicarbazone complexes: synthesis, spectral characterization, DNA binding and DNA cleavage studies

2013 ◽  
Vol 11 (6) ◽  
pp. 1010-1018 ◽  
Author(s):  
Gunasekaran Raja ◽  
Chinnasamy Jayabalakrishnan
Keyword(s):  
Elemental Analysis ◽  
13C Nmr ◽  
Dna Cleavage ◽  
Spectroscopic Studies ◽  
Spectral Studies ◽  
Mass Spectral ◽  
Cleavage Activity ◽  
Dna Cleavage Activity ◽  
Thiosemicarbazone Complexes ◽  
Ct Dna

AbstractA series of new ruthenium(II) complexes were synthesized with Schiff bases derived from salicylaldehyde / o-hydroxyacetophenone/ o-vanillin / 2-hydroxy-1-naphthaldehyde with thiosemicarbazide and acetyl furan. They are characterized by elemental analysis, IR, electronic, 1H NMR, 13C NMR and mass spectral studies. The elemental analysis suggests the stoichiometry to be 1:1 (metal:ligand). Four of these complexes were tested for its binding with CT-DNA using absorption spectroscopic studies and two of these complexes exhibit efficient DNA cleavage activity.

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