Abstract
Ab initio MO calculations on the fragmentation of hypervalent XH4 (X = Se and Te) to XH2 and H2 show that the most favorable transition structure is highly polarized with C1 symmetry, which can be viewed as a trigonal bipyramid where one apical and one equatorial ligand are coupled. The least-motion C2v transition state previously obtained theoretically is much higher in energy.
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