Hydride selenide

Hydride selenides are mixed anion compounds containing both hydride and selenide ions. They are in the category of heteroanionic chalcogenides, or mixed anion compounds. Related compounds include the oxyhydrides, hydride sulfides, and hydride tellurides.

Formation

Salt-like hydride selenides may be formed by heating selenium with a metal hydride in an oxygen-free capsule. For rare earth elements, this method works as long as selenium has enough oxidising power to convert a +2 oxidation state to a +3 state. So for europium and ytterbium it does not work as the monoselenide is more stable. ^[1]

One transition metal complex was formed from a lithium zirconium hydride complex in solution reacting with diphenylphosphine selenide. ^[2]

Properties

With rare earth elements there are two structure depending on the size of the metal ions. The large atoms form a 2H hexagonal anti-nickel arsenide structure, with hydrogen inserted into tetrahedral positions. A 1H hexagonal structure is found in rare earth elements from gadolinium to lutetium, and yttrium. ^[3]

List

formula	system	space group	unit cell Å	volume	density	comment	reference
[η1-3,5-tBu2pz(η-Al)H)2Se] pz=pyrazolato	monoclinic	P21/n	a=14.385 b=11.035 c=16.522 β=98.90° Z=6	2591.1	1.265	melt 272°C; colourless	[4]
Sc2H2Se	trigonal	P3m1	a=3.5664 c=6.1166				[1]
YHSe	hexagonal	P63/m2	a=3.8333 c=3.8876 Z=1		5.64	black; water insensitive; insulator	[1] [5]
Y2H2Se	trigonal	P3m1					[1]
[(C5Me5)2ZrH]2(μ-Se)	orthorhombic	Ccc2	a=20.809 b=20.865 c=19.239 Z=8	8353	1.284	red / orange	[2]
LaHSe	hexagonal	P63/mmc	a=4.1151 c=8.0036 Z=2			bluish grey	[1]
La2H2Se	trigonal	P3m1	a=4.1268 c=6.8733				[6]
La2H3Se	trigonal	P3m1	a=4.139 c=6.960				[6]
La2H4Se	trigonal	R3m	a=4.0542 c=22.609				[6]
CeHSe	hexagonal	P63/mmc	a = 4.0636 c = 7.9481 Z=2			bluish grey	[1]
PrHSe	hexagonal	P63/mmc	a=4.0223 c=7.9183 Z=2			bluish grey	[1]
NdHSe	hexagonal	P63/mmc	a=3.9874 c=7.8888 Z=2			bluish grey	[1]
GdHSe	hexagonal	P63/m2	a=3.8802 c=3.9260 Z=1			bluish grey	[1]
TbHSe	hexagonal	P63/m2	a=3.8517 c=3.9066 Z=1			bluish grey	[1]
DyHSe	hexagonal	P63/m2	a=3.8348 c=3.8874 Z=1			bluish grey	[1]
HoHSe	hexagonal	P63/m2	a = 3.8156 c = 3.8728 Z=1			bluish grey	[1]
ErHSe	hexagonal	P63/m2	a=3.7874 c=3.8636 Z=1			bluish grey	[1]
LuHSe	hexagonal	P63/m2	a=3.7474 c=3.8239 Z=1			bluish grey	[1]

References

1. Schleid, Thomas; Folchnandt, Matthias (March 1996). "MHSe: The First Hydride Selenides of the Lanthanides (M = La-Nd; Gd-Er, Lu)" . Zeitschrift für anorganische und allgemeine Chemie. 622 (3): 455–461. doi:10.1002/zaac.19966220312. ISSN   0044-2313.
2. Hoskin, Aaron J.; Stephan, Douglas W. (1999-06-01). "Decamethylzirconocene-Chalcogenide-Hydride Complexes" . Organometallics. 18 (13): 2479–2483. doi:10.1021/om990180p. ISSN   0276-7333.
3. Folchnandt, Matthias; Rudolph, Daniel; Hoslauer, Jean-Louis; Schleid, Thomas (26 June 2019). "The rare earth metal hydride tellurides RE HTe ( RE =Y, La–Nd, Gd–Er)". Zeitschrift für Naturforschung B. 74 (6): 513–518. doi:10.1515/znb-2019-0060.
4. Zheng, Wenjun; Mösch-Zanetti, Nadia C.; Roesky, Herbert W.; Noltemeyer, Mathias; Hewitt, Manuel; Schmidt, Hans-Georg; Schneider, Thomas R. (2000-12-01). "Alumoxane Hydride and Aluminum Chalcogenide Hydride Compounds with Pyrazolato Ligands" . Angewandte Chemie (in German). 112 (23): 4446–4449. Bibcode:2000AngCh.112.4446Z. doi:10.1002/1521-3757(20001201)112:23<4446::AID-ANGE4446>3.0.CO;2-I.
5. Schleid, Thomas; Meyer, H.-Jürgen (November 1992). "Hydrogen-stabilized yttrium monoselenide" . Journal of Alloys and Compounds. 189 (1): 75–82. doi:10.1016/0925-8388(92)90049-F.
6. Pflug, Christian; Rudolph, Daniel; Schleid, Thomas; Kohlmann, Holger (2022-04-08). "Hydrogenation Reaction Pathways and Crystal Structures of La 2 H 2 Se, La 2 H 3 Se and La 2 H 4 Se". European Journal of Inorganic Chemistry. 2022 (10). Bibcode:2022EJIC.2022E1095P. doi: 10.1002/ejic.202101095 . ISSN   1434-1948.