Metastability of isolated platinum and palladium tetrahalide dianions and the role of electron tunneling

In the present study we have isolated MX 4 2− (M=Pd, Pt; X=Cl, Br) in a room temperature Penning trap under virtually collision-free, ultra high vacuum conditions and have probed for metastable decay on a time scale of up to 1000 s. While PdCl 4 2−, PdBr 4 2− and PtBr 4 2− do not react appreciably o...

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Bibliographic Details
Published in:Chemical physics letters 2000-05, Vol.321 (5), p.426-432
Main Authors: Weis, Patrick, Hampe, Oliver, Gilb, Stefan, Kappes, Manfred M
Format: Article
Language:English
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Summary:In the present study we have isolated MX 4 2− (M=Pd, Pt; X=Cl, Br) in a room temperature Penning trap under virtually collision-free, ultra high vacuum conditions and have probed for metastable decay on a time scale of up to 1000 s. While PdCl 4 2−, PdBr 4 2− and PtBr 4 2− do not react appreciably on this time scale, PtCl 4 2− undergoes tunneling electron loss to form PtCl 4 − with a half-life of 2.5 s. We provide kinetic data and ab-initio quantumchemical calculations of relevant initial and final states as well as Coulomb barriers. All four species are metastable towards halide loss on the basis of these calculations.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(00)00360-2