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POLYHYDRIDE

Polyhydride

Chemical compound

A polyhydride or superhydride is a compound that contains an abnormally large amount of hydrogen. This can be described as high hydrogen stoichiometry

Polyhydride

Lanthanum decahydride

Chemical compound

Lanthanum decahydride is a polyhydride or superhydride compound of lanthanum and hydrogen (LaH10) that has shown evidence of being a high-temperature

Lanthanum decahydride

Lanthanum_decahydride

List of superconductors

NaFeAs Iron-based 20 La3Ni2O7 Oxonickelate 80 (>14 GPa) H3S Polyhydride 203 (155 GPa) II LaH10 Polyhydride 250 (150 GPa) CaH6 Polyhydride 215 (172 GPa)

List of superconductors

List_of_superconductors

Octet rule

Chemical rule of thumb

Michael (1999). "Prediction of the Geometries of Simple Transition Metal Polyhydride Complexes by Symmetry Analysis". J. Am. Chem. Soc. 121 (6): 1348–1358

Octet rule

Octet_rule

Iridium

Chemical element with atomic number 77 (Ir)

always low-spin. Ir(III) and Ir(IV) generally form octahedral complexes. Polyhydride complexes are known for the +5 and +3 oxidation states. One example is

Iridium

Orbital hybridisation

Mixing (superposition) of atomic orbitals

Michael (1999). "Prediction of the Geometries of Simple Transition Metal Polyhydride Complexes by Symmetry Analysis". J. Am. Chem. Soc. 121 (6): 1348–1358

Orbital hybridisation

Orbital_hybridisation

Carbonaceous sulfur hydride

Superconducting chemical substance

hydride was retracted from Nature. CSH is an uncharacterized ternary polyhydride compound of carbon, sulfur and hydrogen with a chemical formula that

Carbonaceous sulfur hydride

Carbonaceous_sulfur_hydride

Argon compounds

Class of chemical compounds

Argon compounds, the chemical compounds that contain the element argon, are rarely encountered due to the inertness of the argon atom. However, compounds

Argon compounds

Argon_compounds

18-electron rule

Chemical property of transition metals

Michael (1999). "Prediction of the Geometries of Simple Transition Metal Polyhydride Complexes by Symmetry Analysis". Journal of the American Chemical Society

18-electron rule

18-electron_rule

Bruno Chaudret

French chemist

of the Scientific Council of IFPEN (from 2007 to 2011). B. Chaudret Polyhydrides and Nanoparticles: A 35 year Trip in Organometallic Chemistry Histoire

Bruno Chaudret

Bruno_Chaudret

Kenneth G. Caulton

American inorganic chemist (died 2025)

worked on the chemistry of paramagnetic organometallic complexes, metal polyhydride complexes and the dihydrogen ligand, catalytic activation of carbon monoxide

Kenneth G. Caulton

Kenneth_G._Caulton

Iridium compounds

always low-spin. Ir(III) and Ir(IV) generally form octahedral complexes. Polyhydride complexes are known for the +5 and +3 oxidation states. One example is

Iridium compounds

Iridium_compounds

Iron hydride

Index of articles associated with the same name

is stable at pressures exceeding 65 GPa. Iron pentahydride FeH5 is a polyhydride, where there is more hydrogen than expected by valence rules. It is stable

Iron hydride

Iron_hydride

Dihydrogen complex

Containing intact H2 as a ligand

in free H2. Some complexes containing multiple hydrogen ligands, i.e. polyhydrides, also exhibit short H−H contacts. It has been suggested that distances

Dihydrogen complex

Dihydrogen_complex

Uranium(IV) hydride

Metal hydride composed of uranium and hydrogen

Laura (2007). "A Combined Experimental and Theoretical Study of Uranium Polyhydrides with New Evidence for the Large Complex UH4(H2)6". The Journal of Physical

Uranium(IV) hydride

Uranium(IV)_hydride

Hydridonitride

Chemical compounds containing H+ and N– ions in a single phase

21°C at a pressure of 1 GPa, which is considerably lower than for other polyhydrides. This has been called "red matter" as it is red under high pressure,

Hydridonitride

Binary compounds of hydrogen

Chemical compounds containing only hydrogen and one other chemical element

central atoms. These are very unstable but some have been shown to exist. Polyhydrides or superhydrides are compounds in which the number of hydrogen atoms

Binary compounds of hydrogen

Binary_compounds_of_hydrogen

Yttrium compounds

Chemical substances containing yttrium

yttrium hydrides are known at standard conditions, YH2 and YH3. YH9, a polyhydride is stable at high pressures, and is a superconductor at temperatures

Yttrium compounds

Yttrium_compounds

Transition metal hydride

Chemical compounds

hydrides include the anions in Mg2FeH6 and Mg2NiH4. Some of these anionic polyhydrides satisfy the 18-electron rule, many do not. Because of their high lattice

Transition metal hydride

Transition_metal_hydride