ISOELECTRONIC DIMERS [(XH3)(2), (YH2)(2), (ZH)(2), AND (RG)(2)] IN THE GROUPS OF THE PERIODIC SYSTEM - AB-INITIO QUANTUM-CHEMICAL CALCULATIONS

The (ZH)(2), (YH2)(2), (XH3)(2) and (Rg)(2) dimers [Z = F-At; Y = O, P o; X = N, Bi; Rg = rare gas] were studied ab initio using the CCSD(T) and MP2 procedures. Average relativistic effective potentials were use d for all the halogens, while Stuttgart effective core potentials were used for the remaining non-hydrogen atoms. All the (HX)(2) structures are H-bonded. All the stabilization energies mutually approach when p assing Gown the group of the periodic system.