New Results in the Chemistry of Complex Compounds of Metals in Lower Oxidation States

✍ Scribed by Prof. Dr.-Ing. H. Behrens

• Publisher: John Wiley and Sons
• Year: 1968
• Tongue: English
• Weight: 264 KB
• Volume: 7
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.196802313

✦ Synopsis

a further H atom to BeH requires no additional "promotion energy". The calculated limits of error in our results arise mainly because the "interpair correlation energy", although small, is not negligible and so far can only be estimated rather than calculated.

BeHz(gas) is exothermic with respect to BeH + 1/2 HZ or Be(gas) + Hz. but endothermic (by 38 * 6 kcal/mole) with respect to Be(so1id) + H2 or (by 48 i 6 kcal/mole) with respect to the known[3,41 solid BeHz which, however, apparently does not consist of BeH2 molecules but is high-polymeric. The BeHz molecule cannot be obtained by heating solid BeHz since at the temperature at which this decomposes into the elements f31 (about 400 OK) the BeH2 equilibrium pressure amounts to only 10-18l3 atm. However, reaction of metallic Be and Hz ( p >, 1 atm) at temperatures between 1000 and 1500'K should afford BeHz molecules in measurable concentration.