Solid Шаблон:Chem2 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 Шаблон:Chem2 and Шаблон:Chem2 produced on a solid hydrogen matrix are warmed.[4] Such a structure is known for solid [[aluminium hydride|Шаблон:Chem2]].[5] When heated above Шаблон:Val, 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 Шаблон:Val.
Several compounds with In-H bonds have been reported.[6] Examples of complexes with two hydride ligands replaced by other ligands are Шаблон:Chem2[7] and Шаблон:Chem2.
Although Шаблон:Chem2 is labile, adducts are known with the stoichiometry Шаблон:Chem2 (n = 1 or 2).[8]
1:1 amine adducts are made by the reaction of Шаблон:Chem2 (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 (Шаблон:Chem2) have been characterised crystallographically. The average In-H bond length is 168 pm.[6] Indium hydride is also known to form adducts with NHCs.[9]
