Configuration closed-shell

The ability of xenon to react is easily explained. Although it has a closed-shell configuration,... 

The terms innocent and noninnocent ligands are widely used to emphasize the fact that some ligands do not necessarily possess a closed-shell configuration. These terms can be used meaningfully only in conjunction with the spectroscopic oxidation state of the metal ion. In this book, we generally refer to spectroscopic oxidation numbers, unless stated differently. 

Some of the few complete sets of enthalpies for binary fluorides are collected in Tables XVIII and XIX. The inversion in dissociation heats for copper and beryllium fluorides can be associated with the closed-shell configurations of Be2+ and Cu+. The alternations in bond energies... 

Fig. 10. Calculated geometries and heats of formation of (a) methylcarbene (b) dimethylcarbene (c) formylcarbene (d) closed shell configuration of C3...

As a result of this electron-filling scheme for jellium clusters, the magic numbers for closed shell configurations in a jellium cluster are very different from those in free atoms. The first magic number of chemical significance in a jellium sphere is the 20 valence electron configuration of white phosphorus P4 and other isoelectronic species of the type E4 (E = As, Sb, Bi) and E4" (E = Si, Ge, Sn, Pb), which are shown by the NICS method to be highly aromatic systems [39, 79]. 

Only one structure of Cyg has a closed-shell configuration. It possesses Dy symmetry and is therefore chiral [48]. Its two enantiomers, C76 and ent-Cyg are normally isolated as a 1 1 racemic mixture. Four reversible reduction couples corresponding to 0/—1, —lj—2, —21—2), and - ij-A can be observed by CV in PhCN, DCM, and ODCB (see Table 5) [37, 59]. Six evenly spaced waves have been detected in a 4 1 (v/v) PhMe/MeCN mixture at — 15°C, but the sixth reduction is observed at the limit of the solvent potential window and appears to be irreversible... 

It is of interest that a Co (II) dimer of the composition Co2(CN)ro contains the same number, 34, of electrons in the combined outer shells of the two cobalt atoms as does Co2(CO)g. In the absence of strong cobalt-cobalt bonding in these complexes, it would appear that each is just two electrons short of a closed-shell configuration. Similarly, Co(CN)6, with 17 outer electrons is one electron short of an inert-gas configuration. 

The chemistry of the copper(II) ion differs from that of the copper(I) ion in that while the latter has a closed shell configuration, (Ar)3d,10 and forms diamagnetic and colourless complexes,10,17 27 the former has an incomplete d shell configuration, (Ar)3d,9 and its... 

Studies that attempted to probe the electronic structure of the dithio complexes include the correlation of the electronic spectra in a series of R2 Dtc complexes of closed-shell configuration (584). In this study three major electronic absorptions in the spectra were found to be essentially unaffected by the central metal atom of the complexes and were considered intraligand transitions. 

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