Chemistry

Gaseous Dihydrides

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Science  17 Jun 2005:
Vol. 308, Issue 5729, pp. 1717
DOI: 10.1126/science.308.5729.1717a

The reduction of solutions of zinc, cadmium, and mercury ions generates gas-phase compounds that likely are the dihydrides of these metals, but the identity of these gas-phase products has been uncertain, and the solid forms of these compounds decompose back to the elements rather than vaporize. Shayesteh et al. synthesized the di-hydrides of Hg, Cd, and Zn by the direct reaction of excited-state atoms with H2 and were able to characterize the products through analysis of their infrared emission. The short bond lengths obtained by fitting the rotational-vibrational spectra indicate that the dihydrides are more stable than the monohydride radicals. The authors note that, given the production of other hydrides, such as SnH4 and AsH3, by anaerobic bacteria, these species might be produced naturally as well. — PDS

Chem. Eur. J. 10.1002/chem.200500332 (2005).

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