Lithium hydride clusters

In summary, we have shown that small sodium fluoride and lithium hydride clusters with one and two excess electrons exhibit their own characteristic absorption patterns. 

Sodium Fluoride and Lithium Hydride Clusters with... 

STRUCTURES AND OPTICAL RESPONSE OF NONSTOICHIOMETRIC SODIUM FLUORIDE AND LITHIUM HYDRIDE CLUSTERS WITH ONE AND TWO EXCESS ELECTRONS... 

In summary, Figures 4 and 5 illustrate that small sodium fluoride and lithium hydride clusters with one and two excess electrons exhibit their own characteristic spectroscopic patterns, reflecting a strong interplay between stmctural and bonding properties, which are not accessible by extrapolation from their common bulk properties. 

The ground-state properties of nonstoichiometrie X Y clusters (X = Na, Li, K and Y = Cl, F) with single and multiple excess electrons have been extensively studied experimentally [41-43] and theoretically [44-46] since they are good candidates for possible metal-insulator transitions and metallic-ionic segregation in finite systems. Hydrogenation of lithium clusters has been also investigated [47, 48]. It is of interest to establish similarities and differences among properties of alkali halide and alkali hydride clusters, since both bulk materials have a common structure but the electron affinities of F and H atoms are very different (3.4 versus 0.75 eV). The question can be raised to what extent these differences are reflected in properties of small finite systems. 

Note Since this article was written, a number of other studies have appeared on the generation and reactions of gas phase reactive metallic species, including the use of decarboxylation reactions to produce organometallic ions (105-107] and the lithium acetate enolate anion (108j silver and silver hydride cluster ions (109) gold carbenes [110, 111] and metal-oxo cations 112]. 

In ketones having a chiral cluster next to the carbonyl carbon reduction with lithium aluminum hydride gave one of the two possible diastereomers, erythro or threo, in larger proportions. The outcome of the reduction is determined by the approach of the reducing agent from the least hindered side (steric control of asymmetric induction) [828]. With lithium aluminum hydride as much as 80% of one diasteromer was obtained. This ratio is higher with more bulky reducing hydrides [837]. 

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