Chapter 8 - New Trends in Organolanthanide Hydride Chemistry

Add time:09/01/2019    Source:sciencedirect.com

Publisher SummaryThis chapter deals with the trends and developments in the field of organometallic-lanthanide hydride chemistry. This chemistry was born with the pioneering works published in the early 80s. This delay, in comparison with the late d-element hydride chemistry, has several reasons, the main one being the difficulty to apply the usual synthetic methods, that is, the displacement of a halide by a metallic hydride, MH, or borohydride, MBH4, to the synthesis of lanthanide hydrides. A very important point that was not well understood during the first investigations of organolanthanides was the necessity to rigorously exclude oxygen and moisture, and, in some cases, to also avoid the presence of solvents bearing oxygenated functions such as ethers. All the lanthanide hydride complexes are exceedingly reactive, even with the usual solvents or with themselves. Thus, their synthesis has needed more sophisticated methods than the Schlenk techniques. The characterization of the hydride function in organolanthanide hydrides by classical spectroscopic methods remains difficult. The frequent paramagnetism of the lanthanide ion causes both a broadening and a significant shift of the hydride NMR signal away from the diamagnetic region.

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