https://www.whoi.edu/cms/files/RueBruland_MarChem1995_52031.pdf

Complexation of iron(III) by natural organic ligands in the Central North Pacific as determined by a new competitive ligand equilibration/adsorptive cathodic stripping voltammetric method

Structural chemistry of transition metal complexes of oximes

Carbohydrates as ligands: coordination equilibria and structure of the metal complexes

Publisher Summary Mossbauer spectroscopy can be likened to ultraviolet spectroscopy. Both techniques employ a source of radiation, an absorber and a detector. In Mossbauer spectroscopy, we consider transitions between nuclear energy levels with the emission and absorption of y rays; whereas, in ultraviolet spectroscopy, we consider the transitions between electronic energy levels with the emission and absorption of ultraviolet radiation. To observe resonance, a range of source photon energies is scanned: in ultraviolet by the use of a prism or grating, and in Mossbauer by employing the Doppler effect. The energy of the y ray (E,) is varied by the well-known Doppler formula d E = (V/C)E, where AE = change in energy of y photon, 11 = velocity of source relative to the absorber, and c = velocity of light. As in ultraviolet, absorption is plotted versus the energy of source photon (usually in velocity units for Mossbauer). Different compounds of one isotope give different spectra— that is, the nuclear energy levels are sensitive to the extranuclear environment. These differences in spectra can be attributed to the hyperfine interactions; the interactions between the nuclear charge distribution, and the extranuclear electric and magnetic fields. These hyperfine interactions give rise to the isomer shift (IS.) , the quadrupole splitting (Q.S.), and the magnetic Zeeman splitting.

Mössbauer Spectra of Inorganic Compounds: Bonding and Structure

Exposure to metal-containing aerosols has been linked with adverse health outcomes for almost every organ in the human body. Commercially available techniques for quantifying particulate metals are time-intensive, laborious, and expensive; often sample analysis exceeds $100. We report a simple technique, based upon a distance-based detection motif, for quantifying metal concentrations of Ni, Cu, and Fe in airborne particulate matter using microfluidic paper-based analytical devices. Paper substrates are used to create sensors that are self-contained, self-timing, and require only a drop of sample for operation. Unlike other colorimetric approaches in paper microfluidics that rely on optical instrumentation for analysis, with distance-based detection, analyte is quantified visually based on the distance of a colorimetric reaction, similar to reading temperature on a thermometer. To demonstrate the effectiveness of this approach, Ni, Cu, and Fe were measured individually in single-channel devices; detection limits as low as 0.1, 0.1, and 0.05 μg were reported for Ni, Cu, and Fe. Multiplexed analysis of all three metals was achieved with detection limits of 1, 5, and 1 μg for Ni, Cu, and Fe. We also extended the dynamic range for multi-analyte detection by printing concentration gradients of colorimetric reagents using an off-the-shelf inkjet printer. Analyte selectivity was demonstrated for common interferences. To demonstrate utility of the method, Ni, Cu, and Fe were measured from samples of certified welding fume; levels measured with paper sensors matched known values determined gravimetrically.

https://stacks.cdc.gov/view/cdc/32928/cdc_32928_DS1.pdf

Multiplexed paper analytical device for quantification of metals using distance-based detection

Some theoretical and practical problems in the use of organic reagents in chemical analysis—IV: Infra-red and ultra-violet spectrophotometric study of the dimethylglyoxime complexes of transition metals

Some theoretical and practical problems in the use of organic reagents in chemical analysis—V: Effect of electrophilic and nucleophilic substituents on the stability of salicylaldoxime complexes of transition metals

The thermal analysis of metal complexes—I. Relationship between the thermal stability and the equilibrium stability of complexes

On the basis of the thermal investigation of MpynX
 z
 mixed complexes (where M=Mn2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+; py=pyridine; orα-, Β- andγ-picoline; X=Cl−, Br−, I−, OCN−, SCN−, NO
 3
 −
 , SO
 4
 2−
 ; andn=2,3,4,6;z=1,2), factors influencing the stability of the metal-pyridine-N bond have been determined. On the basis of the measured magnetic susceptibilities the symmetry of the coordina tion sphere of the central atom has been established in the intermediate products formed by the thermal decomposition of cobalt(II) complexes.

K. Burger

Papers

Some theoretical and practical problems in the use of organic reagents in chemical analysis—IV: Infra-red and ultra-violet spectrophotometric study of the dimethylglyoxime complexes of transition metals

Some theoretical and practical problems in the use of organic reagents in chemical analysis—V: Effect of electrophilic and nucleophilic substituents on the stability of salicylaldoxime complexes of transition metals

The thermal analysis of metal complexes—I. Relationship between the thermal stability and the equilibrium stability of complexes

Thermal analysis of metal complexes, III

Chemistry of mixed ligand complexes—V The Mössbauer investigation of polynuclear mixed iron (0) carbonyl complexes