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Indium trihydride is an inorganic compound with the chemical formula (). It has been observed in matrix isolation and laser ablation experiments. Gas phase stability has been predicted. The infrared spectrum was obtained in the gas phase by laser ablation of indium in presence of hydrogen gas. is of no practical importance.
Although is labile, adducts are known with the stoichiometry ( n = 1 or 2). 1:1 amine adducts are made by the reaction of (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 () have been characterised crystallographically. The average In-H bond length is 168 pm. Indium hydride is also known to form adducts with NHCs.
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