Cation isoelectronic

Ms " clusters have 12 framework bonding electrons as has [BsHs]- (p. 161) the anions are also isoelectronic with the well-known cation [Bis]. Similarly, the alloy NaSn. 2.23 reacts with cryptand in ethylenediamine to give dark-red crystals of [Na(ciypt)]4 [Sng] the anion is the first example of a C41, unicapped Archi-median antiprism (Fig. 10. lOc) and differs from the >3/, structure of the isoelectronic cation [Bis] + which, in the salt Bi+[Bi9] +[HfCl6]5 (p. 591), features a tricapped trigonal prism, as in [BgHg] " (p. 153). The emerald green species [Pb9] , which is stable in liquid NH3 solution, has not so far proved amenable to isolation via ciyptand-complexed cations. 

In a series of isoelectronic cations, such as Na, Mg ", and Al ", the radius decreases rapidly with increasing positive charge. The number of electrons is constant but the nuclear charge increases and so pulls the electrons in and the radii decrease. 

Describe and explain the trend in ion hydration enthalpies for the isoelectronic cations Na+, Mg24, and Al3+. See Table 8.8. 

It is of interest that 78 and the isoelectronic cation 79+ have the same... 

The molecular structure of S2N2, as shown in Fig. 16.7.2(a), is aZ)2h square-planar ring with S-N edge 165 pm, somewhat analogous to the isoelectronic cation S + (Fig. 16.4.2). The valence-bond representations of the S2N2 molecule are as follows ... 

In the course of these studies key features such as olefin coordination [19,20], olefin insertion (propagation) [16,21,22], /(-hydrogen elimination [16,21,22], and /3-alkyl elimination [23] could be spectroscopically and structurally proven. In particular, yttrium aluminates have been proposed to model isoelectronic cationic homo- and heterobridged Zr/Al heterobimetallic complexes as dormant species and potential polymer chain transfer candidates [24]. Such zirconium aluminate complexes seem to be elusive [25], while the first structurally characterized titanium alumi-... 

The value of a is larger for isoelectronic halide than noble gas and smaller for isoelectronic cations. The a values do not show dramatic decrease as a function of... 

TT-complexes have seen sig-synthesis methodology neu-the isoelectronic cationic and the cationic (ri -arene) ri -... 

Shape Comparison of Isoelectronic Cation and Molecule Pairs... 

An isoelectronic cation, [Au[CH2P(CH3)3] 2], has also been reported and was shown to exhibit similar properties. Zinc and cadmium halides form polymeric materials with the ylide. ... 

The exact, non-relativistic, ground-state momental for the hydrogen atom and isoelectronic cations with nuclear charge Z, first worked out by Podolsky and Pauling... 

Three types of arene r-complexes have seen significant development in synthesis methodology neutral )] -arene-Cr(CO)3, the isoelectronic cationic )] -arene-Mn(CO)3, and the cationic rj -arene) rj -cyclopentadienyl)iron(II) complexes (Figure The... 

Focusing on isoelectronic cations, we see that the radii of tripositive ions (ions that bear three positive charges) are smaller than those of dipositive ions (ions that bear two positive charges), which in turn are smaller than unipositive ions (ions... 

Focusing on isoelectronic cations, we see that the radii of tripositive ions (ions that bear three positive charges) are smaller than those of dipositive ions (ions that bear two positive charges), which in turn are smaller than unipositive ions (ions that bear one positive charge). This trend is nicely illustrated by the sizes of three isoelectronic ions in the third period Al, Mg, and Na (see Figure 8.8). The Al ion has the same number of electrons as Mg, but it has one more proton. Thus, the electron cloud in Al is pulled inward more than that in Mg. The smaller radius of Mg compared with that of Na can be similarly explained. Turning to isoelectronic... 

It would be interesting to know the structure of the unknown monovalent anion of 4.186 and of the isoelectronic cation of 4.18a would a structure intermediate between these result ... 

---