Indium trihydride is an inorganic compound with the chemical formula (InH3). It has been observed in matrix isolation and laser ablation experiments.[2][3] Gas phase stability has been predicted.[4] The infrared spectrum was obtained in the gas phase by laser ablation of indium in presence of hydrogen gas [5] InH3 is of no practical importance.
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| Names | |
|---|---|
| Systematic IUPAC name | |
| Other names Indium(III) hydride Indium trihydride | |
| Identifiers | |
3D model (JSmol) | |
| ChEBI | |
| ChemSpider | |
| 163932 | |
PubChem CID | |
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| Properties | |
| InH3 | |
| Molar mass | 117.842 g/mol |
| Melting point | −90 °C (−130 °F; 183 K) (decomposes) |
| Structure | |
| Trigonal planar | |
| Dihedral | |
| Related compounds | |
Related metallanes | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Chemical properties
Solid InH3 is a three-dimensional network polymeric structure, where In atoms are connected by In-H-In bridging bonds, is suggested to account for the growth of broad infrared bands when samples of InH3 and InD3 produced on a solid hydrogen matrix are warmed.[5] Such a structure is known for solid AlH3.[6] When heated above −90 °C, indium trihydride decomposes to produce indium–hydrogen alloy and elemental hydrogen. As of 2013, the only known method of synthesising indium trihydride is the autopolymerisation of indane below −90 °C.
Other indium hydrides
Several compounds with In-H bonds have been reported.[7] Examples of complexes with two hydride ligands replaced by other ligands are (K+)3[K((CH3)2SiO)+7][InH(CH2C(CH3)3)−3]4[8] and HIn(−C6H4−ortho-CH2N(CH3)2)2.
Although InH3 is labile, adducts are known with the stoichiometry InH3Ln (n = 1 or 2).[9]1:1 amine adducts are made by the reaction of Li+[InH4]− (lithium tetrahydridoindate(III)) with a trialkylammonium salt. The trimethylamine complex is only stable below −30 °C or in dilute solution. The 1:1 and 1:2 complexes with tricyclohexylphosphine (PCy3) have been characterised crystallographically. The average In-H bond length is 168 pm.[7] Indium hydride is also known to form adducts with NHCs.[10]