Cation electronic configuration

Electronic Structure Cation Electronic configuration A corundum (cm-1) A periclase (cm-1) A aqueous (cm-1) CFSE of hexahydrate Pairing energy (cm-1)... 

Electronic structure Cation Electronic configuration Octahedron elongated along tetrad axis Octahedron compressed along tetrad axis Configuration of the most stable six-coordinated site... 

Cation Electronic configuration Octahedron (regular) (pyroxene Ml) Tetragonally elongated octahedron (olivine Ml) Trigonally compressed octahedron (olivine M2) Monoclinic six-coordinated site (pyroxene M2)... 

Electronic structure Cation Electronic configuration sa octahedral tetrahedral ASel (oct - tet) J/(deg.mole) ASel (Is—hs) J/(deg.mole)... 

It was suggestedthat bicyclobutane formation from conjugated dienes occurs in a concerted fashion from vibrationally relaxed singlet having an allyl anion-methyl cation electronic configuration. 

Fig. 49. Predicted Fermi levels for cation electronic configurations in various crystal structures with examples from oxides having rutile structure. (With permission from the authors and Marcel Dekker, Inc., New York. From Ref. 454.)...

While the Co corrole-Fe/Mn porphyrin dyads were active electrocatalysts, the homobimetallic Co porphyrin-corrole dyads operate at lower overpotentials and favor 4-electron reduction to a greater extent. This was attributed to the locus of reduction in each complex apparently, the porphyrin is reduced first in the homometallic dimer, whereas the corrole is the site of the first reduction in the heterometallic dimers. A later article presented EPR and spectroelectrochemical evidence supporting the assignment of a Co(III) Ji-cation electronic configuration for the oxidized derivatives of monomeric Co triarylcorrolates, suggesting that the dimeric five-coordinate Co corrole catalysts are also Co(III) 7i-cation radicals [147]. Further study is needed to elucidate this point. 

Cations Electronic configuration Calculated moments Classical Measured... 

Cations Electronic configuration Calculated moments using Eg. B3 Measured moments (gg)... 

Whether an element is the source of the cation or anion in an ionic bond depends on several factors for which the periodic table can serve as a guide In forming ionic compounds elements at the left of the periodic table typically lose electrons giving a cation that has the same electron configuration as the nearest noble gas Loss of an elec tron from sodium for example yields Na which has the same electron configuration as neon... 

Transfer of an electron from a sodium atom to a chlorine atom yields a sodium cation and a chloride anion both of which have a noble gas electron configuration... 

Although rare-earth ions are mosdy trivalent, lanthanides can exist in the divalent or tetravalent state when the electronic configuration is close to the stable empty, half-fUed, or completely fiUed sheUs. Thus samarium, europium, thuUum, and ytterbium can exist as divalent cations in certain environments. On the other hand, tetravalent cerium, praseodymium, and terbium are found, even as oxides where trivalent and tetravalent states often coexist. The stabili2ation of the different valence states for particular rare earths is sometimes used for separation from the other trivalent lanthanides. The chemicals properties of the di- and tetravalent ions are significantly different. 

As befits the electron configuration of elemental calcium, the metal is very reactive, readily losing two valence electrons to form the dispositive ion. In aqueous solution and ia its compounds, is colorless. Most calcium compounds ate white, unless the cation is paired with a colored anion. The ion... 

Figure 11.15 shows the Fliickel MOs of cyclopentadienyl anion. Like benzene and cyclo-heptatrienyl cation, cyclopentadienyl anion has six tt electrons and a closed-shell electron configuration. 

The most obvious features of Fig. 24.1 are the relative positions of the -t-2 oxidation states. For manganese this state, represented by the high-spin Mn cation, is much the most stable. This may be taken as an indication of the stability of the symmetrical d electron configuration. 

---