Details are given for the preparation of "uranocene," U(C8H8)2, from UC14 and CSH82-in THF. Uranocene reacts only slowly with water or acetic acid but decomposes with oxygen, bases, and strong acids. It does not undergo electrophilic substitutions or metallation reactions. Its chemistry is discussed in terms of a simple theory of the electronic structure that involves covalent interaction of the highest occupied e2u ligand MO's with metal fx yi and f(z= _ AO's.
In situ environmental high-resolution electron microscopy (in situ
EHREM) under different gaseous
environments and ex situ HREM have been used to directly probe
commercially important vanadyl
pyrophosphate ((VO)2P2O7) catalysts
used in the oxidation of n-butane to maleic anhydride.
These fundamental
studies of catalyst−adsorbate interactions have shown that novel
microstructural changes occur in vanadyl
pyrophosphate catalysts when the catalyst is reduced, partially
oxidized, or exposed to N2 and steam
environments for extended periods of 100−300 h for the first time.
The microstructural changes of vanadyl
pyrophosphates are related to the development of extended misfit glide
shear plane defects accommodating
nonstoichiometry. The complex characteristics of long-term effects
of water vapor and the effect of cation
promoters of iron and antimony in vanadyl pyrophosphates are explored
to improve our understanding of
their effects on the catalysts toward n-butane oxidation.
Correlations of microstructural changes with reaction
chemistry suggest that the changes are associated with catalyst
reactivity and lattice oxygen diffusion rates.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.