Periodic trends in chemical reactivity: reactions of scandium(1+), yttrium(1+), lanthanum(1+), and lutetium(1+) with hydrogen, deuterium and hydrogen-d1

Autor:	J. L. Elkind, L. S. Sunderlin, P. B. Armentrout
Rok vydání:	1989
Předmět:	Degree (graph theory) Binding energy General Engineering chemistry.chemical_element Bond-dissociation energy Lutetium chemistry.chemical_compound chemistry Physical chemistry Molecular orbital Hydrogen deuteride Physical and Theoretical Chemistry Bond energy Energy (signal processing)
Zdroj:	The Journal of Physical Chemistry. 93:3151-3158
ISSN:	1541-5740 0022-3654
DOI:	10.1021/j100345a054
Popis:	The reactions of Sc{sup +}, Y{sup +}, La{sup +}, and Lu{sup +} with H{sub 2}, D{sub 2}, and HD are examined by use of guided ion beam mass spectrometry. Sc{sup +}, Y{sup +} and La{sup +} are found to react primarily via an insertion mechanism, while Lu{sup +} reacts impulsively at threshold and in a direct manner at higher energies. A simple molecular orbital model coupled with adiabatic surface crossings is used to explain the reactivity seen. The results are analyzed to give the O K bond energies D{degree}(Sc{sup +}-H) = 2.44 {plus minus} 0.09 eV, D{degree} (Y{sup +}-H) = 2.66 {plus minus} 0.06 eV, D{degree} (La{sup +}-H) = 2.48 {plus minus} 0.09 eV, and a more tentative value of D{degree} (Lu{sup +}-H) = 2.11 {plus minus} 0.16 eV (48.6 {plus minus} 3.7 kcal/mol). The results suggest that intrinsic M{sup +}-H bond dissociation energies for third-row metals are about 60 kcal/mol, similar to values for the first and second rows.
Databáze:	OpenAIRE
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