Solid mercury dihydride: mercurophilic bonding in molecular HgH(2) polymers
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Updated: Aug 15, 2026

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1Department of Chemistry, University of Virginia, P.O. Box 400319, Charlottesville, Virginia 22904-4319, USA.
Abstract:
Atomic mercury subjected to mercury arc irradiation reacts in solid hydrogen to give the linear HgH(2) molecule with strong IR absorptions at 1902 and 773 cm(-1). Annealing leads to HgH(2) dimer and trimer, and warming above 7 K allows the hydrogen matrix to sublime and solid HgH(2) to form. This covalent molecular solid is characterized by strong IR absorptions at 1802 and 673 cm(-1) and by decomposition at 150-170 K.
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