Back تساوي إلكتروني Arabic Izoelektronicita Czech Isoelektronisch German Isoelectronicidad Spanish Isoelektroniko Basque ایزوالکترونیسیتی Persian Isoelektronisuus Finnish Isoélectronique French Isileictreonach Irish Isoelektronisitas ID
Isoelectronicity is a phenomenon observed when two or more molecules have the same structure (positions and connectivities among atoms) and the same electronic configurations, but differ by what specific elements are at certain locations in the structure. For example, CO, NO+
, and N
2 are isoelectronic, while CH
3COCH
3 and CH
3N=NCH
3 are not.[1]
This definition is sometimes termed valence isoelectronicity. Definitions can sometimes be not as strict, sometimes requiring identity of the total electron count and with it the entire electronic configuration.[2] More usually, definitions are broader, and may extend to allowing different numbers of atoms in the species being compared.[3]
The importance of the concept lies in identifying significantly related species, as pairs or series. Isoelectronic species can be expected to show useful consistency and predictability in their properties, so identifying a compound as isoelectronic with one already characterised offers clues to possible properties and reactions. Differences in properties such as electronegativity of the atoms in isolelectronic species can affect reactivity.
In quantum mechanics, hydrogen-like atoms are ions with only one electron such as Li2+
. These ions would be described as being isoelectronic with hydrogen.
- ^ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "isoelectronic". doi:10.1351/goldbook.I03276
- ^ Isoelectronic Configurations Archived 2017-07-17 at the Wayback Machine iun.edu
- ^ A. A. Aradi & T. P. Fehlner, "Isoelectronic Organometallic Molecules", in F. G. A. Stone & Robert West (eds.) Advances in Organometallic Chemistry Vol. 30 (1990), Chapter 5 (at p. 190) google books link