AB-INITIO CALCULATIONS OF THE HYDROGEN-PEROXIDE HYDROGEN HALIDE-COMPLEXES (HOOH...XH, X=F, CL)

Ab initio molecular orbital calculations have been performed in the st udy of the hydrogen-bonded complexes between hydrogen peroxide and hyd rogen halide (XH, X = F, Cl). Five stationary points are characterized (structures 1-5); using different basis sets (6-31G* and 6-311G(3d,2 p)), with and without adding diffuse functions, and employing differen t levels of theory (HF, MP2, MP4(SDTQ)). The nature of the studied str uctures has been analyzed; structures 1, 3, and 5 are true minima, and structures 2, and 4 are transition states. The binding energies of th ese complexes have been determined and corrected for the basis set sup erposition error (BSSE).