scholarly journals Complexes of 2,6-dihydroxybenzoic acid with divalent metal ions: Synthesis, crystal structure, spectral studies, and biological activity enhancement

2016 ◽  
Vol 221 ◽  
pp. 617-623 ◽  
Author(s):  
Shella Permatasari Santoso ◽  
Suryadi Ismadji ◽  
Artik Elisa Angkawijaya ◽  
Felycia Edi Soetaredjo ◽  
Alchris Woo Go ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Biological Activity ◽  
Metal Ions ◽  
Divalent Metal ◽  
Spectral Studies ◽  
Divalent Metal Ions ◽  
Dihydroxybenzoic Acid ◽  
Activity Enhancement

Synthesis and Chelation Properties of a New Polymeric Ligand Derived from 1-Amino-2-Naphthol-4-Sulfonic Acid

2015 ◽  
Vol 98 (1) ◽  
pp. 188-191
Author(s):  
Dhanasekaran Manivannan ◽  
Valsala Madhavan Nair Biju
Keyword(s):  
Metal Ions ◽  
Sulfonic Acid ◽  
Divalent Metal ◽  
Chelating Resin ◽  
Spectral Studies ◽  
Divalent Metal Ions ◽  
Solid Sorbent ◽  
Lead And Zinc ◽  
Copper Manganese ◽  
Seawater Samples

Abstract A novel chelating resin for preconcentration of heavy metals from various seawater samples has been developed by condensing 1-amino-2-hydroxy-7-[(4-hydroxyphenyl)diazenyl] naphthalene-4-sulfonic acid (AHDNS) with formaldehyde (1:2 mole ratio) in the presence of oxalic acid as the catalyst. The resin thus obtained was used as a solid sorbent for the separationof divalent metal ions present attrace levels in seawater. The functionalized phenol (AHDNS) was characterized by spectral studies. The polymeric resin AHDNS-formaldehyde (AHDNS-F) obtained by condensing thefunctionalized phenol and formaldehyde was characterized by IR and NMR spectral studies. The chelating property of the AHDNS-F resin towards divalent metal ions was studied as a function of pH and in the presence of electrolyte. The metal uptake properties of the resin were determined by using an atomic absorption spectrophotometer. This procedure was validated for recovery of divalent metal ions from seawater samples. The recoveries of cadmium, cobalt, copper, manganese, lead, and zinc were above 92% under the optimum preconcentration conditions. The LOD was <0.73 μg/L and the RSDs were <2%. Thus, the AHDNS-F resin can be widely used as a solid sorbent for the preconcentration of trace metals at ppm levelsin seawater samples.

Stability constants and spectral studies of complexes of 2-hydroxy-5-methylazobenzene-2′-carboxylic acid with some divalent metal ions

1984 ◽  
Vol 62 (11) ◽  
pp. 2299-2301
Author(s):  
C. Mahalingam ◽  
J. K. Sthapak ◽  
D. D. Sharma ◽  
R. L. Tiwari ◽  
Smita Sthapak
Keyword(s):  
Carboxylic Acid ◽  
Metal Ions ◽  
Metal Complexes ◽  
Stability Constants ◽  
Divalent Metal ◽  
Reflectance Spectra ◽  
Spectral Studies ◽  
Divalent Metal Ions ◽  
The Stability

The stability constants of metal complexes of 2-hydroxy-5-methylazobenzene-2′-carboxylic acid have been determined spectrophotometrically. These follow the Irving–Williams sequence: log KOH(H) = 10.67, log K1(Co) = 9.02, log K1(Ni) = 9.68, log K1(Cu) = 13.37, log K1(Zn) = 7.58, and [Formula: see text]The chelates of Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), and [Formula: see text] with the dye have been prepared and characterized on the basis of their ir and reflectance spectra.

Microcalorimetric evaluation of the biological activity of polyene complexes with divalent metal ions: Mg(II), Ca(II), Ni(II), Cu(II) and Zn(II)

1985 ◽  
Vol 108 (2) ◽  
pp. 129-132 ◽  
Author(s):  
Anthony E. Beezer ◽  
Paul O'Brien ◽  
Roger J. Miles ◽  
Won-Bong Park ◽  
Wai L. Sham
Keyword(s):  
Biological Activity ◽  
Metal Ions ◽  
Divalent Metal ◽  
Divalent Metal Ions

scholarly journals Solution equilibria studies of complexes of divalent metal ions with 2-aminophenol and 3,4-dihydroxybenzoic acid

Polyhedron ◽  
2015 ◽  
Vol 88 ◽  
pp. 29-39 ◽  
Author(s):  
Ivon Kusmijo Chandra ◽  
Artik Elisa Angkawijaya ◽  
Shella Permatasari Santoso ◽  
Suryadi Ismadji ◽  
Felycia Edi Soetaredjo ◽  
...  
Keyword(s):  
Metal Ions ◽  
Divalent Metal ◽  
Divalent Metal Ions ◽  
Dihydroxybenzoic Acid ◽  
Solution Equilibria

Complex Formation Study of Binary and Ternary Complexes Including 2,3-Dihydroxybenzoic Acid, N-acetylcysteine and Divalent Metal Ions

2016 ◽  
Vol 45 (4) ◽  
pp. 518-533 ◽  
Author(s):  
Shella Permatasari Santoso ◽  
Artik Elisa Angkawijaya ◽  
Suryadi Ismadji ◽  
Aning Ayucitra ◽  
Felycia Edi Soetaredjo ◽  
...  
Keyword(s):  
Complex Formation ◽  
Metal Ions ◽  
Divalent Metal ◽  
Ternary Complexes ◽  
Divalent Metal Ions ◽  
Dihydroxybenzoic Acid ◽  
Binary And Ternary Complexes

Interaction of divalent metal ions with the NADP+-malic enzyme from maize leaves

1991 ◽  
Vol 81 (4) ◽  
pp. 462-466 ◽  
Author(s):  
Maria Fabiana Drincovich ◽  
Alberto A. Iglesias ◽  
Carlos S. Andreo
Keyword(s):  
Metal Ions ◽  
Malic Enzyme ◽  
Divalent Metal ◽  
Divalent Metal Ions ◽  
Maize Leaves
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