Complex metal hydride

Complex metal hydrides are salts wherein the anions contain hydrides. In the older chemical literature as well as contemporary materials science textbooks, a "metal hydride" is assumed to be nonmolecular, i.e. three-dimensional lattices of atomic ions. In such systems, hydrides are often interstitial and nonstoichiometric, and the bonding between the metal and hydrogen atoms is significantly ionic. In contrast, complex metal hydrides typically contain more than one type of metal or metalloid and may be soluble but invariably react with water. They exhibit ionic bonding between a positive metal ion with molecular anions containing the hydride. In such materials the hydrogen is bonded with significant covalent character to the second metal or metalloid atoms.[1]

Examples

In general, complex metal hydrides have the formula MxM'yHn, where M is an alkali metal cation or cation complex and M' is a metal or metalloid. Well known examples feature group 13 elements, especially boron and aluminium including sodium aluminium hydride, NaAlH4 (also known as sodium alanate), lithium aluminum hydride, LiAlH4, and lithium borohydride, (LiBH4). Complex metal hydrides are often soluble in etherial solvents. Other complex metal hydrides are numerous. Illustrative examples include the salts [MgBr(THF)2]4FeH6 and K2ReH9.[1]

gollark: ```Unfortunately, it is unavailable, possibly forever, because (according to an email):Thank you for your request to access the Dragon Cave API from host dc.osmarks.tk. At this time, your request could not be granted, for the following reason: You have, through your own admission on the forums, done the exact thing that got EATW banned from the API.This may be a non-permanent issue; feel free to re-submit your request after correcting any issue(s) listed above.Thanks, T.J. Land presumably due to this my server and computer (yes, I should use a VPS, whatever) can no longer access DC. Whether this is sickness checking, scraping, or using EATW's approximation for optimal view count I know not, but oh well. Due to going against the unwritten rules of DC (yes, this is why I was complaining about ridiculous T&C issues) this hatchery is now nonfunctional. Service may be restored if I actually get some notification about what exactly the problem is and undoing it will not make the whole thing pointless. The text at the bottom is quite funny, though.```
gollark: I could add a T&C stating that it is the hatchery's automatic systems' prerogative to take stuff which is sick out of rotation, but none would care.
gollark: They effectively give helping permission by submitting it to a hatchery, but that's irrelevant.
gollark: Ah, well, it *could* be interpreted that way, I guess.
gollark: I mean, they want views if it's in a hatchery.

See also

References
  1. Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
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