Alkali metal aurides

The relatively high electron affinity of Au (EA = 2.3 eV) suggests that Au could behave as a pseudohalogen in forming negatively charged ions. In addition, Au (electronic configuration [Xe] 4R 5d °6s ) is isoelectronic with Hg°. A few alkali metal aurides M+Au are known (M = Na, K,... 

Gold is intermediate between transition and non-transition metal behaviour, since gold(I) has a closed shell configuration, 5d Based on the isomer shift for gold metal (assumed to be 5d °6s ) and the alkali metal aurides (Au, 5d 6s ), it has been suggested that unit increase in n, corresponds to an increase in isomer shift of about 8 mm/s (Sham, Watson Periman, 1981). 

Band structure cesium auride, 25 240-241 graphite-alkali metal compounds, 23 287 Band theory, for one-dimensional electrical Conductors, 26 237-241 Barbituric acid, 18 187 Barium... 

These isoelectroiuc relationships have resulted in recent years to compounds containing alkali metal cations, e.g. Na , K , etc., and the isolation of salts of the auride anion Au . They are analogues of the hydride anion [107]. As the study of transition metal and lanthanide compounds progressed, these ideas were extended to metal ions which had half-filled shells, i.e. Mn ", Eu ", Tb" ", with each of the relevant d or f orbitals containing a single electron and all the electrons having parallel spins [108],... 

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