Metal ion selectivities of the highly preorganized tetradentate ligand 1,10-phenanthroline-2,9-dicarboxamide with lanthanide(III) ions and some actinide ions

2011 ◽  
Vol 99 (3) ◽  
pp. 161-166 ◽  
Author(s):  
Danielle Merrill ◽  
Robert D. Hancock
Keyword(s):  
Metal Ion ◽  
Tetradentate Ligand ◽  
Actinide Ions ◽  
Ion Selectivities

Highly Selective Separation and Enrichment of Phosphopeptides by Uranyl-Salophen Immobilized Silica Gel Material

2015 ◽  
Vol 1095 ◽  
pp. 341-344 ◽  
Author(s):  
Can Hui Xu ◽  
Guang Liang Zhang ◽  
Xin Zhou ◽  
Xi Lin Xiao ◽  
Chang Ming Nie ◽  
...  
Keyword(s):  
Silica Gel ◽  
Metal Ion ◽  
High Selectivity ◽  
Separation Efficiency ◽  
Solid Phase ◽  
Tetradentate Ligand ◽  
Peptide Mixtures ◽  
New Material ◽  
Solid Phase Material

The characterization of phosphoproteins requires highly specific methods for the separation and enrichment of phosphopeptides. Here we report a novel metal ion-immobilized solid phase material for the separation and enrichment of phosphopeptides. The material is uranyl-salophen-silica gel (USSG) particles in which salophen is a tetradentate ligand of uranyl ion. In USSG salophen is connected on the surface of silica gel and uranyl is bound on the surface through its coordination with salophen. Phosphopeptides can be selectively retained by USSG because uranyl-salophen can bind phosphate moiety with strong affinity and high selectivity. The new material USSG has been successfully used for the separation of phosphopeptides from peptide mixtures with the separation efficiency of 97.0% to 97.4%.

Unusual Metal Ion Selectivities of the Highly Preorganized Tetradentrate Ligand 1,10-Phenanthroline-2,9-dicarboxamide: A Thermodynamic and Fluorescence Study

2011 ◽  
Vol 50 (17) ◽  
pp. 8348-8355 ◽  
Author(s):  
Danielle Merrill ◽  
James M. Harrington ◽  
Hee-Seung Lee ◽  
Robert D. Hancock
Keyword(s):  
Metal Ion ◽  
Fluorescence Study ◽  
Ion Selectivities

Open-chain polyamine ligands with more rigid double connecting bridges. Study of their metal ion selectivities by molecular mechanics calculation, crystallography, and thermodynamics

1990 ◽  
Vol 29 (2) ◽  
pp. 264-270 ◽  
Author(s):  
Robert D. Hancock ◽  
M. Patrick Ngwenya ◽  
Ann Evers ◽  
Peter W. Wade ◽  
Jan C. A. Boeyens ◽  
...  
Keyword(s):  
Molecular Mechanics ◽  
Metal Ion ◽  
Open Chain ◽  
Molecular Mechanics Calculation ◽  
Ion Selectivities

Predicted M(H2)12n+ (M = Ac, Th, Pa, U, La and n = 3, 4) complexes with twenty-four hydrogen atoms bound to the metal ion

2019 ◽  
Vol 55 (54) ◽  
pp. 7788-7791
Author(s):  
Meenakshi Joshi ◽  
Tapan K. Ghanty
Keyword(s):  
Metal Ion ◽  
Hydrogen Atoms ◽  
Actinide Ions

The first ever report showing that a maximum of 24 hydrogen atoms can directly bind to actinide ions in M–(η2-H2)12 complexes.

Some metal-ion complexes with ligands formed by reactions of amines with aliphatic carbonyl compounds. VIII. Some copper(II) β-Imino alcohol and β-Imino-olato compounds

1980 ◽  
Vol 33 (6) ◽  
pp. 1219 ◽  
Author(s):  
JWL Martin ◽  
NF Curtis
Keyword(s):  
Carbonyl Compounds ◽  
Metal Ion ◽  
Spin Coupling ◽  
Tetradentate Ligand ◽  
Coupling Constant ◽  
Spin Coupling Constant ◽  
Analogous Structure ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Isomeric Structure

Compounds of copper(II) with chelated β-imino alcohols are formed by reaction of 4-hydroxy-4-methylpentan-2-one, hmp, with copper(II) compounds of ethane-1,2-diamine, 2-methylpropane-1,2-diamine, meso-1,2- diphenylethane-1,2-diamine, 2-(pyridin-2-yl)ethanamine, 3-azapentane- 1,5-diamine and 4-azaheptane-1,7-diamine. A dinuclear, spin-coupled di- μ-olato bridged derivative of a β-imino alkoxide, formed by reaction of hmp with 2-(pyridin-2-yl)ethanaminecopper(II), has a spin-coupling constant J of -286 cm-1, based on magnetic susceptibility data over the 100-300 K temperature range. A related compound formed by N,N- diethylethane-1,2-diamine, which could have an analogous structure containing water, or an isomeric structure with the β-imino alcohol and with di-μ-hydroxide bridging, has a J value of about -130 cm-1, similarly determined. The preparation of a copper(11) compound with the tetradentate ligand 4,6-trimethyl-1,9-bis(pyridin-2-yl)-3,7-diazanon-3- ene, by reaction of bis[2-(pyridin-2-yl)ethanamine]copper(II) perchlorate with acetone, is reported.

scholarly journals Factors affecting the dissociation of metal ions from humic substances

2015 ◽  
Vol 79 (6) ◽  
pp. 1397-1405 ◽  
Author(s):  
Nick Bryan ◽  
Dominic Jones ◽  
Rose Keepax ◽  
Dean Farrelly ◽  
Liam Abrahamsen ◽  
...  
Keyword(s):  
Humic Acid ◽  
Metal Ions ◽  
Humic Substances ◽  
Rate Constants ◽  
Metal Ion ◽  
Dissociation Rate ◽  
Factors Affecting ◽  
Ion Concentrations ◽  
Dissociation Rate Constants ◽  
Actinide Ions

AbstractPreviously, it has been suggested that metal ions complexed to humic acid in the environment might show slower dissociation than those added to humic substances in the laboratory, which has serious implications for the transport of radionuclides in the environment. The dissociation of lanthanide and anthropogenic actinide ions from humic substance complexes has been studied as a function of humic concentration and metal ion:humic concentration ratio. The results suggest that the apparently slower kinetics observed for metal ions complexed in the environment are probably due to the large humic concentrations that are used in those studies. Further, there is no evidence that the dissociation rate constant varies at very low metal ion concentrations. Although humic samples size-fractionated by ultrafiltration showed that more metal may be bound non-exchangeably, there was no evidence for different rate constants. Ultrafiltration of Eu(III)/humic acid mixtures did show a shift in Eu from smaller to larger fractions over a period of two days. Therefore, the results suggest that dissociation rate constants determined in the laboratory at metal ion concentrations higher than those expected in the environment may be used in predicting radionuclide mobility, provided that the humic acid concentration is in the range expected at the site.

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