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- W9490522 abstract "Publisher Summary The determination of the mechanisms underlying chemical reactions leading to the formation of different types of materials is one of the principal occupations of many chemists today. To accomplish this, the dependence of the observed transformation is generally studied as a function of a number of intensive variables such as temperature, pressure, concentration of reactants, and hydrogen ion concentration of the solution. This chapter presents a summarization of recent studies in which the observed changes of the chemical reactivity of gaseous niobium clusters with size was used as a new degree of freedom that assists in deducing the mechanism of the chemical reactions studied. The observed changes in the reactivity of niobium metal clusters of increasing sizes with different reagents may be used as a new degree freedom. This provides a better understanding of the mechanisms and the types of collisions leading to the various chemical reactions and reaches to several conclusions. (1) As the size of the metal clusters increases, the type of collision leading to chemical reaction changes from impulsive to an attractive type, the latter leading to the formation of complexes as intermediates. (2) For reactions producing more than one product, the observed changes or lack of changes in the amount of one product as the second begins to be produced as a function of cluster size helps to identify the mechanism of the reaction involved. (3) If clusters are used as efficient catalysts for dehydrogenation reactions, the reagents are required to have at least one double bond; this suggests a π-complex formation as intermediate. (4) Dehydrogenation reaction on metal clusters is found to have a size threshold. (5) Small clusters are more efficient in abstraction reactions of groups of atoms that are sterically hindered." @default.
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- W9490522 date "1993-01-01" @default.
- W9490522 modified "2023-09-27" @default.
- W9490522 title "Size Dependence of Metal Cluster Reactivity as a Probe of Chemical Reactions" @default.
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- W9490522 doi "https://doi.org/10.1016/b978-0-444-89022-1.50013-4" @default.
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