[Congress Report]

Strong closed-shell interactions

L.G. Kuz'mina (Russia) opened the microsymposium with a discussion of the tendency of the Au(I) atoms to form clusters (d10-d10 interactions) and undergo interesting reactions in which the 'strength' of these 'weak' interactions was made evident. N. Runeberg (Finland) analyzed the contributions to the interaction energy between closed-shell centers, particularly d10 metal centers and concluded that the aurophilic interaction is mainly a consequence of the dynamic electron correlation contribution strengthened by relativistic effects.

V.G. Tsirelson (Russia), and V. Luaña (Spain) discussed chemical bonding, instead of binding, using the concepts of the Atoms in Molecules theory. They showed experimental and calculated electron density maps of rare gases and of fully ionic compounds where closed-shell bonding occurs. They illustrated anion-anion and cation-cation bonding features.

A. Vegas (Spain) presented a comparison between the cation arrays of ionic solids and the structure of the corresponding metals. In an overwhelming number of ionic compounds, cations reproduce, both the topology and distances of the parent metal structure. They have been able to detect an empirical trend in the capacity of many atoms to form aggregates, in spite of having like charges.

A. Vegas and P. Pyykk