page_title: Borderline hydrides
section_title: Synthesis
hierarchical_section_title: Borderline hydrides / Synthesis
caption_attribution_description: English: ChemDraw original
context_page_description: Borderline hydrides typically refer to hydrides formed of hydrogen and elements of the periodic table in group 11 and group 12 and indium and thallium. These compounds have properties intermediate between covalent hydrides and saline hydrides. Hydrides are chemical compounds that contain a metal and hydrogen acting as a negative ion.
context_section_description: Borderline hydrides are most commonly formed via the acidification or reduction of metal salts.
  For instance, copper hydride is formed by reacting copper sulphate and hypophosphorous acid at about 70 °C, forming a yellow precipitate that soon turns red-brown.
  Zinc hydride, ZnH₂, can be formed by the reduction of either a zinc halide or dimethylzinc.
caption: ZnH2 synthesis via reduction of zinc iodide
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