Isoelectronic chemicals

By addressing issue 9 of how isoelectronic chemical reactivities enter the total energy of interaction of two disjoint, nonoverlapping systems [50], we show in Sect. 8 how contact can be made between chemical reactivities and the initial segment of, or portal to, the reaction pathway. As by-products, a clear definition of the chemical stimuli which couple to the reactivity indices, the chemical responses, and a clear definition of dynamic as well as static chemical reactivities emerge, resolving issues 7 and 8, respectively. 

Boron nitride is chemically unreactive, and can be melted at 3000 K by heating under pressure. It is a covalent compound, but the lack of volatility is due to the formation of giant molecules as in graphite or diamond (p. 163). The bond B—N is isoelectronic with C—C. 

Wesendrup, R., Laerdahl, J.K and Schwerdtfeger, P. (1999) Relativistic Effects in Gold Chemistry. VI. Coupled Cluster Calculations for the Isoelectronic Series AuPt , Au2 and AuHg. Joumul of Chemical Physics, 110, 9457-9462. 

It is interesting to note that both CO and CN are isoelectronic with the N2 molecule. That is, they have the same number and arrangement of electrons as the N2 molecule. However, as we will see later, these species are quite different from N2 in their chemical behavior. The properties of many homonudear and heteronudear molecules and ions are presented in Table 3.1. 

There are several important chemical species that consist of four atoms and have a total of 24 valence-shell electrons. Some of the most common isoelectronic species of this type are C032-, N03 , S03, and P() j (known as the metaphosphate ion). Because four atoms would require a total of 32 electrons for each to have an octet, we conclude that eight electrons must be shared in four bonds. With four bonds to the central atom, there can be no unshared pairs on that atom if the octet rule is to be obeyed. Therefore, we can draw the structure for CO, 2 showing one double C=0 bond and two single C-O bonds as... 

The lithium ion and the hydride ion are isoelectronic. Which of the following statements is true of these two chemical species in the ground state ... 

The physical, and often the chemical, properties of isoelectronic molecules are closely related (23). The isoelectronic principle can be extended to a comparison of fluoro with isostructural hydroxo com-... 

Although [Rh4(CO)i2] is isoelectronic and isostructural with [Co4(CO)i2] (mean Rh-Rh distance 2.78 A), it does not display any chemically reversible redox processes. 

Heterocyclic aromatic compounds a. Pyridine and other azabenzenes. The azabenzenes, compounds in which — N= groups replace —CH= groups, often bear remarkable chemical spectroscopic similarities to the parent homooyclic hydrocarbons. This is associated with their being 7r-isoelectronic with them. 

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