Hydrides mixed valence compounds

Re(jj -C6H6)Cp] is a sandwich complex and (147) is a bent metallocene like ReCp2H. Protonation of several of the reported complexes gives new Re hydrides, and complex [Re(jj -C6H6)Cp] has a remarkable chemistry in this respect. Compound (149) can be considered as a Re-Re bonded mixed valency d" -d species. Double-bond hydrogenation also occurs, for example, with (148). 

Additional areas of lanthanide halide chemistry that have been reviewed include the synthesis, phase studies, and structures of complex lanthanide halides - compounds formed between one or more group 1 cation and lanthanide element halides (Meyer 1982). Halides in combination with lanthanide elements in the II, III, and IV oxidation states were considered with the chemistry of the heavier halides being emphasized. More recently the reduced ternary lanthanide halides (Meyer 1983) and the reduced halides of the lanthanide elements were reviewed (Meyer 1988). The latter review considered lanthanides in which the formal oxidation state of the cation was 2 and included hydride halides, oxide halides, mixed-valence ternary halides, and reduced halide clusters. Corbett et al. (1987) discussed the structures and some bonding aspects of highly reduced lanthanide halides and compounds stabilized by a second-period element bound within each cluster, e.g., SC7CIJ2B, SC5CI5B, YjCljC. 

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