This excellent selectivity could be traceable to the ion exchange ability of the interfering ions. The crystallinity and pore size of this MOF remained unchanged in strong acidic (pH 2) and alkaline (pH 11) solutions, resulting in excellent adsorption performance over a broad pH range (3.0–9.0...
Ammonium chromate is a salt with the formula (NH4)2CrO4. It forms yellow, monoclinic crystals; made from ammonium hydroxide and ammonium dichromate; used in photography as a sensitizer for gelatin coa.. What is the noble gas electron configuration of the chromium ion, Cr+6? Is the ion ...
In spite of its having an electron configuration that suggests a possible oxidation state of +6, iron forms no halogen compounds in which it has an oxidation state higher than +3. The halogen compounds of iron consist of the series FeX2 and FeX3. However, Fe3+ is an oxidizing agent tha...
Isotope-labelling exchange experiments were carried out to investigate the kinetic stability of Cr(III) complexes with humic substances (HS). To compare the results with those of an ion, not expected to form kinetically stable HS complexes with respect to its electron configuration, Cu(II) was ...
The oxidation state +3 is the most stable, and a large number of chromium(III) compounds are known. Chromium(III) can be obtained by dissolving elemental chromium in acids like hydrochloric acid or sulfuric acid. The Cr3+ ion has a similar radius (63 pm) to the Al3+ ion (radius 50 ...
To compare the results with those of an ion, not expected to form kinetically stable HS complexes with respect to its electron configuration, Cu(II) was investigated under the same conditions. HS solutions of different origin were therefore spiked with 53 Cr(III) or 65 Cu(II) after ...
The nano-antenna patterns were milled by FEI Helios NanoLab 600 dual beam focused ion beam (FIB) system. All the scanning electron microscope (SEM) images were taken using either FIB or Electron Beam Lithography (EBL-Raith 150) system. For the characterization of our devices, a Lastek Q-...
Unlike purely organic polymers, metallopolymers were found to provide sufficient contrast for direct electron imaging due to the presence of the metal centers. Reversible ion uptake and desorption were clearly observed with dichromate (10 mM NH4Cr2O7) as well. Due to the higher contrast of ...
The complexes have been characterised by elemental analyses, electrical conductance, magnetic measurement, molecular weight determination, electron spin resonance, and infrared spectral studies. Chromium (I) has a low- spin d5 configuration in these complexes.doi:10.1080/00945718608071381...
Chromium is the fourth transition metal found on the periodic table, and has an configuration of [Ar] 3d5 4s1. It is also the first element in the periodic table whose ground-state electron configuration violates the Aufbau principle. This occurs again later in the periodic table with other ...