The trivalent chromium ion has been successfully used as the optical activator in a large number of tunable crystalline laser materials. Some of the unique properties of its 3d 3 electron configuration which have led to this widespread success are reviewed. It is found that a combination of ...
Two layered MOFs (FIR-53 [155] and Ag-3 [157]) have been reported for Cr2O72− adsorption through ion exchange. A typical example of a layered MOF ion exchanger is Ag-3 synthesized by reacting AgBF4 and 4-(5-methyl-3-pyridine)-1,2,4-triazole in CH3CN at room temperature. The...
What is the noble gas electron configuration of the chromium ion, Cr+6? Is the ion paramagnetic or diamagnetic? What is the set of quantum numbers that represents its last electron?This is pretty much fantasy. Chromium does not form a +6 ion in a compound. It might be possible to hit ...
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 p...
Manganese(VII) oxyhalides have been obtained, and although MnO3F and MnO3Cl are known, they are not important compounds. MnF4 can be prepared by the reaction of the elements. In spite of its having an electron configuration that suggests a possible oxidation state of +6, iron forms no ...
The product of the oligomerization has been characterized by the positive-ion mode MALDI-TOF mass spectrometry throughout selecting a matrix that facilitates its ionization (DHB). The MALDI-TOF was used to the direct molecular weight determination of the oligomeric poly(2-chloroallyl alcohol). More...
ion has a similar radius (63 pm) to Al3+ (radius 50 pm), and they can replace each other in some compounds, such as in chrome alum and alum. Chromium(III) tends to form octahedral complexes. Commercially available chromium(III) chloride hydrate is the dark green complex [CrCl2(H2O)4...
Metallopolymer-based electrodes, especially poly(vinyl)ferrocene (PVF), have shown remarkable ion-uptake capacities for organic contaminants based on electrochemically activated chemical interactions23,24,25. The main features of these systems are the fast electron transfer and redox processes at moderate...
-3 less common -4 less common Pauling Electronegativity oxidation state: 2 1.66 Electron Configuration Orbital Occupancy [Ar] 3d5 4s1 [Ar] represents the closed-shell electron configuration of argon Orbital Filling Order [Ar] 4s1 3d5 [Ar] represents the closed-shell electron conf...
When ion-exchange capacity and reversibility of pure PPy and CNT/PPy nanocomposite thin films were compared using electrochemical quartz microbalance (EQCM) in NaCl, NaClO4, NaNO3, Na2SO4, and NaHCO3 electrolyte solution, the results indicated that the ion exchange kinetics of PPy improved by ...