Abstract
Reactions of Ho 2O 3 with HgO led within dry oxygen at a pressure of 6200 bar and 620 °C to long yellowish needles of the hitherto unknown compound Ho 2HgO 4. X-ray single-crystal structure analysis show monoclinic symmetry, space group C 2h 3-C 2 m ; Z = 4 with a = 13.552; b = 3.609; c = 11.755 A ̊ ; gb = 133.88°. Ho 3+ is surrounded by monocapped trigonal prisms of O 2−. These form a threedimensional network of edge-linked prisms with incorporated Hg 2+-ions. Hg 2+ shows the well known dumb-bell-like coordination by oxygen.
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